diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 000000000..e84613dd6
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,11 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.{js,html}]
+indent_style = space
diff --git a/.eslintrc b/.eslintrc
index 0d67347a8..fcb231522 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -8,11 +8,13 @@
         "max-len": [2, 80, 4],
         "semi": [2, "always"],
         "strict": [2, "never"],
-        "no-console": [2, {"allow": ["log", "warn", "error"]}]
+        "no-console": [2, {"allow": ["log", "warn", "error", "groupCollapsed", "groupEnd", "time", "timeEnd"]}],
+        "valid-jsdoc": ["error", {"requireReturn": false}]
     },
     "env": {
         "node": true,
-        "browser": true
+        "browser": true,
+        "worker": true
     },
     "extends": "eslint:recommended"
 }
diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
new file mode 100644
index 000000000..9ea236ba5
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE.md
@@ -0,0 +1,15 @@
+### Expected behavior
+
+_Please describe what should happen_
+
+### Actual behavior
+
+_Describe what actually happens_
+
+### Steps to reproduce
+
+_Explain what someone needs to do in order to see what's described in *Actual behavior* above_
+
+### Operating system and browser
+
+_e.g. Mac OS 10.11.6 Safari 10.0_
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 000000000..696bd38d7
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,7 @@
+### Proposed changes
+
+_Describe what this Pull Request does_
+
+### Reason for changes
+
+_Explain why these changes should be made. Please include an issue # if applicable._
diff --git a/.gitignore b/.gitignore
index db98532d4..aad54ff5e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,11 @@ npm-*
 # Testing
 /.nyc_output
 /coverage
+/dist.js
+/vm.js
+/vm.min.js
+/playground/assets
+/playground/media
+/playground/vendor.js
+/playground/vm.js
+/playground/zenburn.css
diff --git a/.npmignore b/.npmignore
new file mode 100644
index 000000000..bd86c446a
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,2 @@
+/.nyc_output
+/coverage
diff --git a/.travis.yml b/.travis.yml
index 00dd791d5..a44d53809 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,35 @@
 language: node_js
 node_js:
-- "4"
-- "stable"
+- '4'
+- stable
 sudo: false
 cache:
   directories:
   - node_modules
+install:
+- npm install
+- npm update
+after_script:
+- |
+  # RELEASE_BRANCHES and NPM_TOKEN defined in Travis settings panel
+  declare exitCode
+  $(npm bin)/travis-after-all
+  exitCode=$?
+  if [[
+    # Execute after all jobs finish successfully
+    $exitCode = 0 &&
+    # Only release on release branches
+    $RELEASE_BRANCHES =~ $TRAVIS_BRANCH &&
+    # Don't release on PR builds
+    $TRAVIS_PULL_REQUEST = "false"
+  ]]; then
+    # Authenticate NPM
+    echo "//registry.npmjs.org/:_authToken=\${NPM_TOKEN}" > .npmrc
+    # Set version to timestamp
+    npm --no-git-tag-version version $($(npm bin)/json -f package.json version)-prerelease.$(date +%s)
+    npm publish
+    # Publish to gh-pages as most recent committer
+    git config --global user.email $(git log --pretty=format:"%ce" -n1)
+    git config --global user.name $(git log --pretty=format:"%cn" -n1)
+    ./node_modules/.bin/gh-pages -x -r https://${GH_TOKEN}@github.com/${TRAVIS_REPO_SLUG}.git -d playground -m "Build for $(git log --pretty=format:%H)"
+  fi
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 000000000..ddd2e36c3
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,25 @@
+## Contributing
+The development of scratch-vm is an ongoing process,
+and we love to have people in the Scratch and open source communities help us along the way.
+
+If you're interested in contributing, please take a look at the
+[issues](https://github.com/LLK/scratch-vm/issues) on this repository.
+Two great ways of helping are by identifying bugs and documenting them as issues,
+or fixing issues and creating pull requests. When submitting pull requests please be patient
+-- it can take a while to find time to review them.
+The organization and class structures can't be radically changed without significant coordination
+and collaboration from the Scratch Team, so these types of changes should be avoided.
+
+It's been said that the Scratch Team spends about one hour of design discussion for every pixel in Scratch,
+but some think that estimate is a little low. While we welcome suggestions for new features in our
+[suggestions forum](https://scratch.mit.edu/discuss/1/) (especially ones that come with mockups), we are unlikely to accept PRs with
+new features that haven't been thought through and discussed as a group. Why? Because we have a strong belief
+in the value of keeping things simple for new users. To learn more about our design philosophy,
+see [the Scratch Developers page](https://scratch.mit.edu/developers), or
+[this paper](http://web.media.mit.edu/~mres/papers/Scratch-CACM-final.pdf).
+
+Beyond this repo, there are also some other resources that you might want to take a look at:
+* [Community Guidelines](https://github.com/LLK/scratch-www/wiki/Community-Guidelines) (we find it important to maintain a constructive and welcoming community, just like on Scratch)
+* [Open Source forum](https://scratch.mit.edu/discuss/49/) on Scratch
+* [Suggestions forum](https://scratch.mit.edu/discuss/1/) on Scratch
+* [Bugs & Glitches forum](https://scratch.mit.edu/discuss/3/) on Scratch
diff --git a/Makefile b/Makefile
index 74886ded4..14a5870ba 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,7 @@ ESLINT=./node_modules/.bin/eslint
 NODE=node
 TAP=./node_modules/.bin/tap
 WEBPACK=./node_modules/.bin/webpack --progress --colors
+WEBPACK_DEV_SERVER=./node_modules/.bin/webpack-dev-server
 
 # ------------------------------------------------------------------------------
 
@@ -11,6 +12,9 @@ build:
 watch:
 	$(WEBPACK) --watch
 
+serve:
+	$(WEBPACK_DEV_SERVER)
+
 # ------------------------------------------------------------------------------
 
 lint:
@@ -27,4 +31,4 @@ coverage:
 
 # ------------------------------------------------------------------------------
 
-.PHONY: build lint test coverage benchmark
+.PHONY: build lint test coverage benchmark serve
diff --git a/README.md b/README.md
index 3d6fd7fa0..b701ca103 100644
--- a/README.md
+++ b/README.md
@@ -1,33 +1,45 @@
 ## scratch-vm
 #### Scratch VM is a library for representing, running, and maintaining the state of computer programs written using [Scratch Blocks](https://github.com/LLK/scratch-blocks).
 
-[![Build Status](https://travis-ci.com/LLK/scratch-vm.svg?token=xzzHj4ct3SyBTpeqxnx1&branch=develop)](https://travis-ci.com/LLK/scratch-vm)
+[![Build Status](https://travis-ci.org/LLK/scratch-vm.svg?branch=develop)](https://travis-ci.org/LLK/scratch-vm)
+[![Coverage Status](https://coveralls.io/repos/github/LLK/scratch-vm/badge.svg?branch=develop)](https://coveralls.io/github/LLK/scratch-vm?branch=develop)
+[![Dependency Status](https://david-dm.org/LLK/scratch-vm.svg)](https://david-dm.org/LLK/scratch-vm)
+[![devDependency Status](https://david-dm.org/LLK/scratch-vm/dev-status.svg)](https://david-dm.org/LLK/scratch-vm#info=devDependencies)
 
 ## Installation
+This requires you to have Git and Node.js installed.
+
+In your own node environment/application:
 ```bash
-npm install scratch-vm
+npm install https://github.com/LLK/scratch-vm.git
+```
+If you want to edit/play yourself:
+```bash
+git clone https://github.com/LLK/scratch-vm.git
+cd scratch-vm
+npm install
 ```
 
-## Setup
-```js
-var VirtualMachine = require('scratch-vm');
-var vm = new VirtualMachine();
+## Development Server
+This requires Node.js to be installed.
 
-// Block events
-workspace.addChangeListener(function(e) {
-    // Handle "tapping" a block
-    if (e instanceof Blockly.Events.Ui && e.element === 'click') {
-        var stackBlock = workspace.getBlockById(e.blockId).getRootBlock().id;
-        vm.runtime.toggleStack(stackBlock);
-    // Otherwise, pass along to the block listener
-    } else {
-        vm.blockListener(e);
-    }
-});
+For convenience, we've included a development server with the VM. This is sometimes useful when running in an environment that's loading remote resources (e.g., SVGs from the Scratch server).
 
-// Run threads
-vm.runtime.start();
+## Running the Development Server
+Open a Command Prompt or Terminal in the repository and run:
+```bash
+npm start
 ```
+Or on Windows:
+```bash
+StartServerWindows.bat
+```
+
+## Playground
+To run the Playground, make sure the dev server's running and go to [http://localhost:8080/](http://localhost:8080/) - you will be directed to the playground, which demonstrates various tools and internal state.
+
+![VM Playground Screenshot](https://i.imgur.com/nOCNqEc.gif)
+
 
 ## Standalone Build
 ```bash
@@ -42,42 +54,51 @@ make build
 </script>
 ```
 
+## How to include in a Node.js App
+For an extended setup example, check out the /playground directory, which includes a fully running VM instance.
+```js
+var VirtualMachine = require('scratch-vm');
+var vm = new VirtualMachine();
+
+// Block events
+workspace.addChangeListener(vm.blockListener);
+
+// Run threads
+vm.start();
+```
+
 ## Abstract Syntax Tree
 
 #### Overview
-The Virtual Machine constructs and maintains the state of an [Abstract Syntax Tree](https://en.wikipedia.org/wiki/Abstract_syntax_tree) (AST) by listening to events emitted by the [scratch-blocks](https://github.com/LLK/scratch-blocks) workspace via the `blockListener`. At any time, the current state of the AST can be viewed by inspecting the `vm.runtime.blocks` object.
+The Virtual Machine constructs and maintains the state of an [Abstract Syntax Tree](https://en.wikipedia.org/wiki/Abstract_syntax_tree) (AST) by listening to events emitted by the [scratch-blocks](https://github.com/LLK/scratch-blocks) workspace via the `blockListener`. Each target (code-running object, for example, a sprite) keeps an AST for its blocks. At any time, the current state of an AST can be viewed by inspecting the `vm.runtime.targets[...].blocks` object.
 
 #### Anatomy of a Block
+The VM's block representation contains all the important information for execution and storage. Here's an example representing the "when key pressed" script on a workspace:
 ```json
 {
-    "id": "^1r~63Gdl7;Dh?I*OP3_",
-    "opcode": "wedo_motorclockwise",
-    "next": null,
-    "fields": {
-        "DURATION": {
-            "name": "DURATION",
-            "value": null,
-            "blocks": {
-                "1?P=eV(OiDY3vMk!24Ip": {
-                    "id": "1?P=eV(OiDY3vMk!24Ip",
-                    "opcode": "math_number",
-                    "next": null,
-                    "fields": {
-                        "NUM": {
-                            "name": "NUM",
-                            "value": "10",
-                            "blocks": null
-                        }
-                    }
-                }
-            }
-        },
-        "SUBSTACK": {
-            "name": "SUBSTACK",
-            "value": "@1ln(HsUO4!]*2*%BrE|",
-            "blocks": null
+  "_blocks": {
+    "Q]PK~yJ@BTV8Y~FfISeo": {
+      "id": "Q]PK~yJ@BTV8Y~FfISeo",
+      "opcode": "event_whenkeypressed",
+      "inputs": {
+      },
+      "fields": {
+        "KEY_OPTION": {
+          "name": "KEY_OPTION",
+          "value": "space"
         }
+      },
+      "next": null,
+      "topLevel": true,
+      "parent": null,
+      "shadow": false,
+      "x": -69.333333333333,
+      "y": 174
     }
+  },
+  "_scripts": [
+    "Q]PK~yJ@BTV8Y~FfISeo"
+  ]
 }
 ```
 
@@ -90,5 +111,5 @@ make test
 make coverage
 ```
 
-## Donation
-We provide [Scratch](https://scratch.mit.edu) free of charge, and want to keep it that way! Please consider making a [donation](https://secure.donationpay.org/scratchfoundation/) to support our continued engineering, community, and resource development efforts. Donations of any size are appreciated. Thank you!
+## Donate
+We provide [Scratch](https://scratch.mit.edu) free of charge, and want to keep it that way! Please consider making a [donation](https://secure.donationpay.org/scratchfoundation/) to support our continued engineering, design, community, and resource development efforts. Donations of any size are appreciated. Thank you!
diff --git a/StartServerWindows.bat b/StartServerWindows.bat
new file mode 100644
index 000000000..73a4d84db
--- /dev/null
+++ b/StartServerWindows.bat
@@ -0,0 +1,2 @@
+@echo off
+node_modules\.bin\webpack-dev-server --host 0.0.0.0 --content-base .\playground
diff --git a/assets/scratch_cat.svg b/assets/scratch_cat.svg
new file mode 100644
index 000000000..823455468
--- /dev/null
+++ b/assets/scratch_cat.svg
@@ -0,0 +1,42 @@
+<svg version="1.1" id="cat" x="0px" y="0px" width="95px" height="111px" viewBox="0 0 95 111" enable-background="new 0 0 95 111" xml:space="preserve" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <g>
+    <g id="Layer_3">
+      <path fill="#FAA51D" stroke="#000000" d="M22.462,79.039c-2.415-0.451-5.304-1.309-7.742-3.503&#xD;&#xA;&#x9;&#x9;C9.268,70.629,7.526,62.535,3.672,64.622c-3.856,2.088-3.782,15.165,8.353,19.194c4.182,1.391,7.998,1.396,11.091,1.312&#xD;&#xA;&#x9;&#x9;c0.811-0.025,7.717-0.654,10.079-4.074c2.361-3.42,0.719-4.272-0.09-4.744C32.295,75.838,25.878,79.677,22.462,79.039z"/>
+      <path fill="#FFFFFF" d="M4.236,64.877c-1.989,0.613-3.075,4.998-2.076,8.484c0.998,3.49,2.634,5.022,3.863,6.398&#xD;&#xA;&#x9;&#x9;c1.528,1.038-0.72-2.402,1.361-4.15c2.075-1.744,5.733-0.914,5.733-0.914s-2.909-3.987-4.57-6.396&#xD;&#xA;&#x9;&#x9;C6.975,65.988,6.359,64.375,4.236,64.877z"/>
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+    <g>
+      <path fill="#FAA51D" d="M38.217,86.756c0,0-8.832,6.2-17.071,8.412l0.086,0.215c1.247,1.824,5.87,7.497-0.334,9.496&#xD;&#xA;&#x9;&#x9;c-5.333,1.717-15.12-13.104-10.821-15.902c2.626-1.713,4.892-0.252,4.892-0.252s3.474-1.07,6.001-2.345&#xD;&#xA;&#x9;&#x9;c4.303-2.161,5.784-3.453,5.784-3.453s4.184-4.306,6.856-4.137C36.281,78.96,41.669,83.504,38.217,86.756z"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M21.232,95.383c1.247,1.824,5.87,7.497-0.334,9.496&#xD;&#xA;&#x9;&#x9;c-5.333,1.717-15.329-13.344-11.03-16.145c2.626-1.713,5.101-0.01,5.101-0.01s3.474-1.072,6.001-2.348&#xD;&#xA;&#x9;&#x9;c4.303-2.161,5.784-3.453,5.784-3.453"/>
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M38.217,86.756c0,0-10.123,7.107-18.804,8.819"/>
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+    <g id="Layer_7">
+      <path fill="#FFFFFF" stroke="#231F20" d="M47.867,28.619c2.926,4.48,2.619,9.862-0.681,12.015&#xD;&#xA;&#x9;&#x9;c-3.302,2.159-8.351,0.272-11.276-4.208c-2.928-4.48-2.624-9.86,0.678-12.017C39.891,22.253,44.938,24.137,47.867,28.619z"/>
+      <path fill="#231F20" d="M46.079,34.507c0,1.081-0.803,1.957-1.801,1.957c-0.992,0-1.803-0.878-1.803-1.957&#xD;&#xA;&#x9;&#x9;c0-1.08,0.811-1.957,1.803-1.957C45.274,32.55,46.079,33.427,46.079,34.507"/>
+    </g>
+    <path fill="#5E4A42" stroke="#000000" d="M59.766,37.926c1.854,0,4.555-0.284,4.697,0.569c0.143,0.855-1.709,4.203-2.988,4.345&#xD;&#xA;&#x9;c-1.283,0.142-6.125-2.353-6.195-3.919C55.206,37.355,58.055,37.926,59.766,37.926z"/>
+    <g id="Layer_4">
+      <path fill="none" stroke="#231F20" stroke-width="1.2" d="M46.774,45.235c0,0,10.347,3.054,14.217,3.897&#xD;&#xA;&#x9;&#x9;c3.868,0.842,10.851,1.684,10.851,1.684s-7.99,10.245-17.328,7.644C45.176,55.863,45.345,49.975,46.774,45.235z"/>
+    </g>
+  </g>
+</svg>
diff --git a/assets/stage.png b/assets/stage.png
new file mode 100644
index 000000000..b13e9d1f5
Binary files /dev/null and b/assets/stage.png differ
diff --git a/package.json b/package.json
index 1fcd00ef3..15f2dd459 100644
--- a/package.json
+++ b/package.json
@@ -9,18 +9,32 @@
     "type": "git",
     "url": "git+ssh://git@github.com/LLK/scratch-vm.git"
   },
-  "main": "./src/index.js",
+  "main": "./dist.js",
   "scripts": {
-    "test": "make test"
-  },
-  "dependencies": {
-    "htmlparser2": "3.9.0",
-    "memoizee": "0.3.10"
+    "prepublish": "./node_modules/.bin/webpack --bail",
+    "start": "webpack-dev-server",
+    "build": "webpack --colors --progress",
+    "test": "make test",
+    "version": "./node_modules/.bin/json -f package.json -I -e \"this.repository.sha = '$(git log -n1 --pretty=format:%H)'\""
   },
   "devDependencies": {
+    "copy-webpack-plugin": "3.0.1",
     "eslint": "2.7.0",
+    "expose-loader": "0.7.1",
+    "gh-pages": "0.11.0",
+    "highlightjs": "8.7.0",
+    "htmlparser2": "3.9.0",
+    "json": "9.0.4",
     "json-loader": "0.5.4",
+    "lodash.defaultsdeep": "4.6.0",
+    "promise": "7.1.1",
+    "scratch-blocks": "^0.1.0-prepublish",
+    "scratch-render": "^0.1.0-prepublish",
+    "script-loader": "0.7.0",
+    "stats.js": "0.16.0",
     "tap": "5.7.1",
-    "webpack": "1.13.0"
+    "travis-after-all": "1.4.4",
+    "webpack": "1.13.0",
+    "webpack-dev-server": "1.14.1"
   }
 }
diff --git a/playground/index.html b/playground/index.html
new file mode 100644
index 000000000..46fa57cb4
--- /dev/null
+++ b/playground/index.html
@@ -0,0 +1,89 @@
+<!doctype html>
+
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>Scratch VM Playground</title>
+    <link rel="stylesheet" href="playground.css">
+    <link rel="stylesheet" href="zenburn.css">
+</head>
+<body>
+    <div id="vm-devtools">
+        <h2>Scratch VM Playground</h2>
+        <select id="selectedTarget" multiple></select>
+        <div id="projectButtons">
+            <button id="greenflag">Green flag</button>
+            <button id="stopall">Stop</button>
+        </div>
+        <div>
+            Turbo: <input id='turbomode' type='checkbox' />
+        </div>
+        <div>
+            Pause: <input id='pausemode' type='checkbox' />
+        </div>
+        <div>
+            Compatibility (30 TPS):  <input id='compatmode' type='checkbox' />
+        </div>
+        <div>
+            Single stepping:  <input id='singlestepmode' type='checkbox' />
+            <input id='singlestepspeed' type='range' min='1' max='20' value='10' />
+        </div>
+        <br />
+        <ul id="playgroundLinks">
+            <li><a id="renderexplorer-link" href="#">Renderer</a></li>
+            <li><a id="threadexplorer-link" href="#">Threads</a></li>
+            <li><a id="blockexplorer-link" href="#">Block Representation</a></li>
+            <li><a id="importexport-link" href="#">Import/Export</a></li>
+        </ul><br />
+        <div id="tab-renderexplorer">
+            Renderer<br />
+            <canvas id="scratch-stage" style="width: 480px; height: 360px;"></canvas><br />
+        </div>
+        <div id="tab-threadexplorer">
+            Thread explorer
+            <pre id="threadexplorer"></pre>
+        </div>
+        <div id="tab-blockexplorer">
+            Block explorer
+            <pre id="blockexplorer"></pre>
+        </div>
+        <div id="tab-importexport">
+            Import/Export<br />
+            Project ID: <input id="projectId" value="119615668" />
+            <button id="projectLoadButton">Load</button>
+            <button id="createEmptyProject">New Project</button><br />
+            <p>
+                <input type="button" value="Export to XML" onclick="toXml()">
+                &nbsp;
+                <input type="button" value="Import from XML" onclick="fromXml()" id="import">
+                <br /><br />
+                <textarea id="importExport"></textarea>
+            </p>
+        </div>
+    </div>
+
+    <div id="blocks"></div>
+
+    <!-- FPS counter, Syntax highlighter, Blocks, Renderer -->
+    <script src="./vendor.js"></script>
+    <!-- VM Worker -->
+    <script src="./vm.js"></script>
+    <!-- Playground -->
+    <script src="./playground.js"></script>
+    <script>
+        function toXml() {
+            var output = document.getElementById('importExport');
+            var xml = Blockly.Xml.workspaceToDom(workspace);
+            output.value = Blockly.Xml.domToPrettyText(xml);
+            output.focus();
+            output.select();
+          }
+
+          function fromXml() {
+            var input = document.getElementById('importExport');
+            var xml = Blockly.Xml.textToDom(input.value);
+            Blockly.Xml.domToWorkspace(workspace, xml);
+          }
+    </script>
+</body>
+</html>
diff --git a/playground/playground.css b/playground/playground.css
new file mode 100644
index 000000000..3eccd2625
--- /dev/null
+++ b/playground/playground.css
@@ -0,0 +1,73 @@
+body {
+    background: rgb(36,36,36);
+}
+a {
+    color: rgb(217,217,217);
+}
+h2 {
+    font-size: 1em;
+}
+#blocks {
+    position: absolute;
+    left: 40%;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    font-family: "Helvetica Neue", Helvetica, sans-serif;
+}
+#vm-devtools {
+    color: rgb(217,217,217);
+    position: absolute;
+    left: 1%;
+    right: 60%;
+    top: 1%;
+    bottom: 0;
+    width: 35%;
+}
+#blockexplorer, #threadexplorer, #importexport {
+    position: absolute;
+    height: 75%;
+    overflow: scroll;
+    border: 1px solid #fff;
+    background: rgb(36,36,36);
+    color: rgb(217,217,217);
+    font-family: monospace;
+    font-size: 10pt;
+    width: 480px;
+    height: 360px;
+}
+#tab-blockexplorer, #tab-threadexplorer, #tab-importexport {
+    display: none;
+}
+#importExport {
+    width: 480px;
+    height: 360px;
+    background: rgb(36,36,36);
+    color: rgb(217,217,217);
+}
+#projectId {
+    background: rgb(36,36,36);
+    color: rgb(217,217,217);
+    font-family: monospace;
+    font-size: 10pt;
+}
+ul#playgroundLinks {
+    display: block;
+    list-style-type: none;
+    margin: 0;
+    padding: 0;
+    overflow: hidden;
+    background-color: #333;
+}
+#playgroundLinks li {
+    float: left;
+}
+#playgroundLinks li a {
+    display: block;
+    color: white;
+    text-align: center;
+    padding: 5px 10px;
+}
+#playgroundLinks li a:hover {
+    background-color: #111;
+}
diff --git a/playground/playground.js b/playground/playground.js
new file mode 100644
index 000000000..577877ae1
--- /dev/null
+++ b/playground/playground.js
@@ -0,0 +1,312 @@
+var NEW_PROJECT_HASH = 'createEmptyProject';
+
+var loadProject = function () {
+    var id = location.hash.substring(1);
+    if (id === NEW_PROJECT_HASH) {
+        window.vm.createEmptyProject();
+        return;
+    }
+    if (id.length < 1 || !isFinite(id)) {
+        id = '119615668';
+    }
+    var url = 'https://projects.scratch.mit.edu/internalapi/project/' +
+        id + '/get/';
+    var r = new XMLHttpRequest();
+    r.onreadystatechange = function() {
+        if (this.readyState === 4) {
+            if (r.status === 200) {
+                window.vm.loadProject(this.responseText);
+            } else {
+                window.vm.createEmptyProject();
+            }
+        }
+    };
+    r.open('GET', url);
+    r.send();
+};
+
+window.onload = function() {
+    // Lots of global variables to make debugging easier
+    // Instantiate the VM.
+    var vm = new window.VirtualMachine();
+    window.vm = vm;
+
+    // Loading projects from the server.
+    document.getElementById('projectLoadButton').onclick = function () {
+        document.location = '#' + document.getElementById('projectId').value;
+        location.reload();
+    };
+    document.getElementById('createEmptyProject').addEventListener('click',
+    function() {
+        document.location = '#' + NEW_PROJECT_HASH;
+        location.reload();
+    });
+    loadProject();
+
+    // Instantiate the renderer and connect it to the VM.
+    var canvas = document.getElementById('scratch-stage');
+    var renderer = new window.RenderWebGL(canvas);
+    window.renderer = renderer;
+    vm.attachRenderer(renderer);
+
+    // Instantiate scratch-blocks and attach it to the DOM.
+    var workspace = window.Blockly.inject('blocks', {
+        media: './media/',
+        zoom: {
+            controls: true,
+            wheel: true,
+            startScale: 0.75
+        },
+        colours: {
+            workspace: '#334771',
+            flyout: '#283856',
+            scrollbar: '#24324D',
+            scrollbarHover: '#0C111A',
+            insertionMarker: '#FFFFFF',
+            insertionMarkerOpacity: 0.3,
+            fieldShadow: 'rgba(255, 255, 255, 0.3)',
+            dragShadowOpacity: 0.6
+        }
+    });
+    window.workspace = workspace;
+
+    // Attach scratch-blocks events to VM.
+    workspace.addChangeListener(vm.blockListener);
+    var flyoutWorkspace = workspace.getFlyout().getWorkspace();
+    flyoutWorkspace.addChangeListener(vm.flyoutBlockListener);
+
+    // Create FPS counter.
+    var stats = new window.Stats();
+    document.getElementById('tab-renderexplorer').appendChild(stats.dom);
+    stats.dom.style.position = 'relative';
+    stats.begin();
+
+    // Playground data tabs.
+    // Block representation tab.
+    var blockexplorer = document.getElementById('blockexplorer');
+    var updateBlockExplorer = function(blocks) {
+        blockexplorer.innerHTML = JSON.stringify(blocks, null, 2);
+        window.hljs.highlightBlock(blockexplorer);
+    };
+
+    // Thread representation tab.
+    var threadexplorer = document.getElementById('threadexplorer');
+    var cachedThreadJSON = '';
+    var updateThreadExplorer = function (newJSON) {
+        if (newJSON != cachedThreadJSON) {
+            cachedThreadJSON = newJSON;
+            threadexplorer.innerHTML = cachedThreadJSON;
+            window.hljs.highlightBlock(threadexplorer);
+        }
+    };
+
+    // Only request data from the VM thread if the appropriate tab is open.
+    window.exploreTabOpen = false;
+    var getPlaygroundData = function () {
+        vm.getPlaygroundData();
+        if (window.exploreTabOpen) {
+            window.requestAnimationFrame(getPlaygroundData);
+        }
+    };
+
+    // VM handlers.
+    // Receipt of new playground data (thread, block representations).
+    vm.on('playgroundData', function(data) {
+        updateThreadExplorer(data.threads);
+        updateBlockExplorer(data.blocks);
+    });
+
+    // Receipt of new block XML for the selected target.
+    vm.on('workspaceUpdate', function (data) {
+        workspace.clear();
+        var dom = window.Blockly.Xml.textToDom(data.xml);
+        window.Blockly.Xml.domToWorkspace(dom, workspace);
+    });
+
+    // Receipt of new list of targets, selected target update.
+    var selectedTarget = document.getElementById('selectedTarget');
+    vm.on('targetsUpdate', function (data) {
+        // Clear select box.
+        while (selectedTarget.firstChild) {
+            selectedTarget.removeChild(selectedTarget.firstChild);
+        }
+        // Generate new select box.
+        for (var i = 0; i < data.targetList.length; i++) {
+            var targetOption = document.createElement('option');
+            targetOption.setAttribute('value', data.targetList[i][0]);
+            // If target id matches editingTarget id, select it.
+            if (data.targetList[i][0] == data.editingTarget) {
+                targetOption.setAttribute('selected', 'selected');
+            }
+            targetOption.appendChild(
+                document.createTextNode(data.targetList[i][1])
+            );
+            selectedTarget.appendChild(targetOption);
+        }
+    });
+    selectedTarget.onchange = function () {
+        vm.setEditingTarget(this.value);
+    };
+
+    // Feedback for stacks and blocks running.
+    vm.on('STACK_GLOW_ON', function(data) {
+        workspace.glowStack(data.id, true);
+    });
+    vm.on('STACK_GLOW_OFF', function(data) {
+        workspace.glowStack(data.id, false);
+    });
+    vm.on('BLOCK_GLOW_ON', function(data) {
+        workspace.glowBlock(data.id, true);
+    });
+    vm.on('BLOCK_GLOW_OFF', function(data) {
+        workspace.glowBlock(data.id, false);
+    });
+    vm.on('VISUAL_REPORT', function(data) {
+        workspace.reportValue(data.id, data.value);
+    });
+
+    // Feed mouse events as VM I/O events.
+    document.addEventListener('mousemove', function (e) {
+        var rect = canvas.getBoundingClientRect();
+        var coordinates = {
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+            canvasWidth: rect.width,
+            canvasHeight: rect.height
+        };
+        window.vm.postIOData('mouse', coordinates);
+    });
+    canvas.addEventListener('mousedown', function (e) {
+        var rect = canvas.getBoundingClientRect();
+        var data = {
+            isDown: true,
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+            canvasWidth: rect.width,
+            canvasHeight: rect.height
+        };
+        window.vm.postIOData('mouse', data);
+        e.preventDefault();
+    });
+    canvas.addEventListener('mouseup', function (e) {
+        var rect = canvas.getBoundingClientRect();
+        var data = {
+            isDown: false,
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+            canvasWidth: rect.width,
+            canvasHeight: rect.height
+        };
+        window.vm.postIOData('mouse', data);
+        e.preventDefault();
+    });
+
+    // Feed keyboard events as VM I/O events.
+    document.addEventListener('keydown', function (e) {
+        // Don't capture keys intended for Blockly inputs.
+        if (e.target != document && e.target != document.body) {
+            return;
+        }
+        window.vm.postIOData('keyboard', {
+            keyCode: e.keyCode,
+            isDown: true
+        });
+        e.preventDefault();
+    });
+    document.addEventListener('keyup', function(e) {
+        // Always capture up events,
+        // even those that have switched to other targets.
+        window.vm.postIOData('keyboard', {
+            keyCode: e.keyCode,
+            isDown: false
+        });
+        // E.g., prevent scroll.
+        if (e.target != document && e.target != document.body) {
+            e.preventDefault();
+        }
+    });
+
+    // Run threads
+    vm.start();
+
+    // Inform VM of animation frames.
+    var animate = function() {
+        stats.end();
+        stats.begin();
+        window.vm.animationFrame();
+        requestAnimationFrame(animate);
+    };
+    requestAnimationFrame(animate);
+
+    // Handlers for green flag and stop all.
+    document.getElementById('greenflag').addEventListener('click', function() {
+        vm.greenFlag();
+    });
+    document.getElementById('stopall').addEventListener('click', function() {
+        vm.stopAll();
+    });
+    document.getElementById('turbomode').addEventListener('change', function() {
+        var turboOn = document.getElementById('turbomode').checked;
+        vm.setTurboMode(turboOn);
+    });
+    document.getElementById('pausemode').addEventListener('change', function() {
+        var pauseOn = document.getElementById('pausemode').checked;
+        vm.setPauseMode(pauseOn);
+    });
+    document.getElementById('compatmode').addEventListener('change',
+    function() {
+        var compatibilityMode = document.getElementById('compatmode').checked;
+        vm.setCompatibilityMode(compatibilityMode);
+    });
+    document.getElementById('singlestepmode').addEventListener('change',
+    function() {
+        var singleStep = document.getElementById('singlestepmode').checked;
+        vm.setSingleSteppingMode(singleStep);
+    });
+    document.getElementById('singlestepspeed').addEventListener('input',
+    function() {
+        var speed = document.getElementById('singlestepspeed').value;
+        vm.setSingleSteppingSpeed(speed);
+    });
+
+    var tabBlockExplorer = document.getElementById('tab-blockexplorer');
+    var tabThreadExplorer = document.getElementById('tab-threadexplorer');
+    var tabRenderExplorer = document.getElementById('tab-renderexplorer');
+    var tabImportExport = document.getElementById('tab-importexport');
+
+    // Handlers to show different explorers.
+    document.getElementById('threadexplorer-link').addEventListener('click',
+        function () {
+            window.exploreTabOpen = true;
+            getPlaygroundData();
+            tabBlockExplorer.style.display = 'none';
+            tabRenderExplorer.style.display = 'none';
+            tabThreadExplorer.style.display = 'block';
+            tabImportExport.style.display = 'none';
+        });
+    document.getElementById('blockexplorer-link').addEventListener('click',
+        function () {
+            window.exploreTabOpen = true;
+            getPlaygroundData();
+            tabBlockExplorer.style.display = 'block';
+            tabRenderExplorer.style.display = 'none';
+            tabThreadExplorer.style.display = 'none';
+            tabImportExport.style.display = 'none';
+        });
+    document.getElementById('renderexplorer-link').addEventListener('click',
+        function () {
+            window.exploreTabOpen = false;
+            tabBlockExplorer.style.display = 'none';
+            tabRenderExplorer.style.display = 'block';
+            tabThreadExplorer.style.display = 'none';
+            tabImportExport.style.display = 'none';
+        });
+    document.getElementById('importexport-link').addEventListener('click',
+        function () {
+            window.exploreTabOpen = false;
+            tabBlockExplorer.style.display = 'none';
+            tabRenderExplorer.style.display = 'none';
+            tabThreadExplorer.style.display = 'none';
+            tabImportExport.style.display = 'block';
+        });
+};
diff --git a/src/blocks/scratch3.js b/src/blocks/scratch3.js
deleted file mode 100644
index 6bf327642..000000000
--- a/src/blocks/scratch3.js
+++ /dev/null
@@ -1,82 +0,0 @@
-function Scratch3Blocks(runtime) {
-    /**
-     * The runtime instantiating this block package.
-     * @type {Runtime}
-     */
-    this.runtime = runtime;
-}
-
-/**
- * Retrieve the block primitives implemented by this package.
- * @return {Object.<string, Function>} Mapping of opcode to Function.
- */
-Scratch3Blocks.prototype.getPrimitives = function() {
-    return {
-        'control_repeat': this.repeat,
-        'control_forever': this.forever,
-        'control_wait': this.wait,
-        'control_stop': this.stop,
-        'event_whenflagclicked': this.whenFlagClicked,
-        'event_whenbroadcastreceived': this.whenBroadcastReceived,
-        'event_broadcast': this.broadcast
-    };
-};
-
-Scratch3Blocks.prototype.repeat = function(argValues, util) {
-    console.log('Running: control_repeat');
-    // Initialize loop
-    if (util.stackFrame.loopCounter === undefined) {
-        util.stackFrame.loopCounter = parseInt(argValues[0]); // @todo arg
-    }
-    // Decrease counter
-    util.stackFrame.loopCounter--;
-    // If we still have some left, start the substack
-    if (util.stackFrame.loopCounter >= 0) {
-        util.startSubstack();
-    }
-};
-
-Scratch3Blocks.prototype.forever = function(argValues, util) {
-    console.log('Running: control_forever');
-    util.startSubstack();
-};
-
-Scratch3Blocks.prototype.wait = function(argValues, util) {
-    console.log('Running: control_wait');
-    util.yield();
-    util.timeout(function() {
-        util.done();
-    }, 1000 * parseFloat(argValues[0]));
-};
-
-Scratch3Blocks.prototype.stop = function() {
-    console.log('Running: control_stop');
-    // @todo - don't use this.runtime
-    this.runtime.stopAll();
-};
-
-Scratch3Blocks.prototype.whenFlagClicked = function() {
-    console.log('Running: event_whenflagclicked');
-    // No-op
-};
-
-Scratch3Blocks.prototype.whenBroadcastReceived = function() {
-    console.log('Running: event_whenbroadcastreceived');
-    // No-op
-};
-
-Scratch3Blocks.prototype.broadcast = function(argValues, util) {
-    console.log('Running: event_broadcast');
-    util.startHats(function(hat) {
-        if (hat.opcode === 'event_whenbroadcastreceived') {
-            var shadows = hat.fields.CHOICE.blocks;
-            for (var sb in shadows) {
-                var shadowblock = shadows[sb];
-                return shadowblock.fields.CHOICE.value === argValues[0];
-            }
-        }
-        return false;
-    });
-};
-
-module.exports = Scratch3Blocks;
diff --git a/src/blocks/scratch3_control.js b/src/blocks/scratch3_control.js
new file mode 100644
index 000000000..571b1478f
--- /dev/null
+++ b/src/blocks/scratch3_control.js
@@ -0,0 +1,139 @@
+var Cast = require('../util/cast');
+var Timer = require('../util/timer');
+
+function Scratch3ControlBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3ControlBlocks.prototype.getPrimitives = function() {
+    return {
+        'control_repeat': this.repeat,
+        'control_repeat_until': this.repeatUntil,
+        'control_forever': this.forever,
+        'control_wait': this.wait,
+        'control_wait_until': this.waitUntil,
+        'control_if': this.if,
+        'control_if_else': this.ifElse,
+        'control_stop': this.stop,
+        'control_create_clone_of': this.createClone,
+        'control_delete_this_clone': this.deleteClone
+    };
+};
+
+Scratch3ControlBlocks.prototype.getHats = function () {
+    return {
+        'control_start_as_clone': {
+            restartExistingThreads: false
+        }
+    };
+};
+
+Scratch3ControlBlocks.prototype.repeat = function(args, util) {
+    var times = Math.floor(Cast.toNumber(args.TIMES));
+    // Initialize loop
+    if (util.stackFrame.loopCounter === undefined) {
+        util.stackFrame.loopCounter = times;
+    }
+    // Only execute once per frame.
+    // When the branch finishes, `repeat` will be executed again and
+    // the second branch will be taken, yielding for the rest of the frame.
+    // Decrease counter
+    util.stackFrame.loopCounter--;
+    // If we still have some left, start the branch.
+    if (util.stackFrame.loopCounter >= 0) {
+        util.startBranch(1, true);
+    }
+};
+
+Scratch3ControlBlocks.prototype.repeatUntil = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
+    // If the condition is true, start the branch.
+    if (!condition) {
+        util.startBranch(1, true);
+    }
+};
+
+Scratch3ControlBlocks.prototype.waitUntil = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
+    if (!condition) {
+        util.yield();
+    }
+};
+
+Scratch3ControlBlocks.prototype.forever = function(args, util) {
+    util.startBranch(1, true);
+};
+
+Scratch3ControlBlocks.prototype.wait = function(args, util) {
+    if (!util.stackFrame.timer) {
+        util.stackFrame.timer = new Timer();
+        util.stackFrame.timer.start();
+        util.yield();
+        this.runtime.requestRedraw();
+    } else {
+        var duration = Math.max(0, 1000 * Cast.toNumber(args.DURATION));
+        if (util.stackFrame.timer.timeElapsed() < duration) {
+            util.yield();
+        }
+    }
+};
+
+Scratch3ControlBlocks.prototype.if = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
+    if (condition) {
+        util.startBranch(1, false);
+    }
+};
+
+Scratch3ControlBlocks.prototype.ifElse = function(args, util) {
+    var condition = Cast.toBoolean(args.CONDITION);
+    if (condition) {
+        util.startBranch(1, false);
+    } else {
+        util.startBranch(2, false);
+    }
+};
+
+Scratch3ControlBlocks.prototype.stop = function(args, util) {
+    var option = args.STOP_OPTION;
+    if (option == 'all') {
+        util.stopAll();
+    } else if (option == 'other scripts in sprite' ||
+        option == 'other scripts in stage') {
+        util.stopOtherTargetThreads();
+    } else if (option == 'this script') {
+        util.stopThread();
+    }
+};
+
+Scratch3ControlBlocks.prototype.createClone = function (args, util) {
+    var cloneTarget;
+    if (args.CLONE_OPTION == '_myself_') {
+        cloneTarget = util.target;
+    } else {
+        cloneTarget = this.runtime.getSpriteTargetByName(args.CLONE_OPTION);
+    }
+    if (!cloneTarget) {
+        return;
+    }
+    var newClone = cloneTarget.makeClone();
+    if (newClone) {
+        this.runtime.targets.push(newClone);
+    }
+};
+
+Scratch3ControlBlocks.prototype.deleteClone = function (args, util) {
+    if (util.target.isOriginal) return;
+    this.runtime.disposeTarget(util.target);
+    this.runtime.stopForTarget(util.target);
+};
+
+module.exports = Scratch3ControlBlocks;
diff --git a/src/blocks/scratch3_data.js b/src/blocks/scratch3_data.js
new file mode 100644
index 000000000..a40172427
--- /dev/null
+++ b/src/blocks/scratch3_data.js
@@ -0,0 +1,136 @@
+var Cast = require('../util/cast');
+
+function Scratch3DataBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3DataBlocks.prototype.getPrimitives = function () {
+    return {
+        'data_variable': this.getVariable,
+        'data_setvariableto': this.setVariableTo,
+        'data_changevariableby': this.changeVariableBy,
+        'data_listcontents': this.getListContents,
+        'data_addtolist': this.addToList,
+        'data_deleteoflist': this.deleteOfList,
+        'data_insertatlist': this.insertAtList,
+        'data_replaceitemoflist': this.replaceItemOfList,
+        'data_itemoflist': this.getItemOfList,
+        'data_lengthoflist': this.lengthOfList,
+        'data_listcontainsitem': this.listContainsItem
+    };
+};
+
+Scratch3DataBlocks.prototype.getVariable = function (args, util) {
+    var variable = util.target.lookupOrCreateVariable(args.VARIABLE);
+    return variable.value;
+};
+
+Scratch3DataBlocks.prototype.setVariableTo = function (args, util) {
+    var variable = util.target.lookupOrCreateVariable(args.VARIABLE);
+    variable.value = args.VALUE;
+};
+
+Scratch3DataBlocks.prototype.changeVariableBy = function (args, util) {
+    var variable = util.target.lookupOrCreateVariable(args.VARIABLE);
+    var castedValue = Cast.toNumber(variable.value);
+    var dValue = Cast.toNumber(args.VALUE);
+    variable.value = castedValue + dValue;
+};
+
+Scratch3DataBlocks.prototype.getListContents = function (args, util) {
+    var list = util.target.lookupOrCreateList(args.LIST);
+    // Determine if the list is all single letters.
+    // If it is, report contents joined together with no separator.
+    // If it's not, report contents joined together with a space.
+    var allSingleLetters = true;
+    for (var i = 0; i < list.contents.length; i++) {
+        var listItem = list.contents[i];
+        if (!((typeof listItem === 'string') &&
+              (listItem.length == 1))) {
+            allSingleLetters = false;
+            break;
+        }
+    }
+    if (allSingleLetters) {
+        return list.contents.join('');
+    } else {
+        return list.contents.join(' ');
+    }
+};
+
+Scratch3DataBlocks.prototype.addToList = function (args, util) {
+    var list = util.target.lookupOrCreateList(args.LIST);
+    list.contents.push(args.ITEM);
+};
+
+Scratch3DataBlocks.prototype.deleteOfList = function (args, util) {
+    var list = util.target.lookupOrCreateList(args.LIST);
+    var index = Cast.toListIndex(args.INDEX, list.contents.length);
+    if (index === Cast.LIST_INVALID) {
+        return;
+    } else if (index === Cast.LIST_ALL) {
+        list.contents = [];
+        return;
+    }
+    list.contents.splice(index - 1, 1);
+};
+
+Scratch3DataBlocks.prototype.insertAtList = function (args, util) {
+    var item = args.ITEM;
+    var list = util.target.lookupOrCreateList(args.LIST);
+    var index = Cast.toListIndex(args.INDEX, list.contents.length + 1);
+    if (index === Cast.LIST_INVALID) {
+        return;
+    }
+    list.contents.splice(index - 1, 0, item);
+};
+
+Scratch3DataBlocks.prototype.replaceItemOfList = function (args, util) {
+    var item = args.ITEM;
+    var list = util.target.lookupOrCreateList(args.LIST);
+    var index = Cast.toListIndex(args.INDEX, list.contents.length);
+    if (index === Cast.LIST_INVALID) {
+        return;
+    }
+    list.contents.splice(index - 1, 1, item);
+};
+
+Scratch3DataBlocks.prototype.getItemOfList = function (args, util) {
+    var list = util.target.lookupOrCreateList(args.LIST);
+    var index = Cast.toListIndex(args.INDEX, list.contents.length);
+    if (index === Cast.LIST_INVALID) {
+        return '';
+    }
+    return list.contents[index - 1];
+};
+
+Scratch3DataBlocks.prototype.lengthOfList = function (args, util) {
+    var list = util.target.lookupOrCreateList(args.LIST);
+    return list.contents.length;
+};
+
+Scratch3DataBlocks.prototype.listContainsItem = function (args, util) {
+    var item = args.ITEM;
+    var list = util.target.lookupOrCreateList(args.LIST);
+    if (list.contents.indexOf(item) >= 0) {
+        return true;
+    }
+    // Try using Scratch comparison operator on each item.
+    // (Scratch considers the string '123' equal to the number 123).
+    for (var i = 0; i < list.contents.length; i++) {
+        if (Cast.compare(list.contents[i], item) == 0) {
+            return true;
+        }
+    }
+    return false;
+};
+
+module.exports = Scratch3DataBlocks;
diff --git a/src/blocks/scratch3_event.js b/src/blocks/scratch3_event.js
new file mode 100644
index 000000000..7f56e3baf
--- /dev/null
+++ b/src/blocks/scratch3_event.js
@@ -0,0 +1,89 @@
+var Cast = require('../util/cast');
+
+function Scratch3EventBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3EventBlocks.prototype.getPrimitives = function() {
+    return {
+        'event_broadcast': this.broadcast,
+        'event_broadcastandwait': this.broadcastAndWait,
+        'event_whengreaterthan': this.hatGreaterThanPredicate
+    };
+};
+
+Scratch3EventBlocks.prototype.getHats = function () {
+    return {
+        'event_whenflagclicked': {
+            restartExistingThreads: true
+        },
+        'event_whenkeypressed': {
+            restartExistingThreads: false
+        },
+        'event_whenthisspriteclicked': {
+            restartExistingThreads: true
+        },
+        'event_whenbackdropswitchesto': {
+            restartExistingThreads: true
+        },
+        'event_whengreaterthan': {
+            restartExistingThreads: false,
+            edgeActivated: true
+        },
+        'event_whenbroadcastreceived': {
+            restartExistingThreads: true
+        }
+    };
+};
+
+Scratch3EventBlocks.prototype.hatGreaterThanPredicate = function (args, util) {
+    var option = Cast.toString(args.WHENGREATERTHANMENU).toLowerCase();
+    var value = Cast.toNumber(args.VALUE);
+    // @todo: Other cases :)
+    if (option == 'timer') {
+        return util.ioQuery('clock', 'projectTimer') > value;
+    }
+    return false;
+};
+
+Scratch3EventBlocks.prototype.broadcast = function(args, util) {
+    var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
+    util.startHats('event_whenbroadcastreceived', {
+        'BROADCAST_OPTION': broadcastOption
+    });
+};
+
+Scratch3EventBlocks.prototype.broadcastAndWait = function (args, util) {
+    var broadcastOption = Cast.toString(args.BROADCAST_OPTION);
+    // Have we run before, starting threads?
+    if (!util.stackFrame.startedThreads) {
+        // No - start hats for this broadcast.
+        util.stackFrame.startedThreads = util.startHats(
+            'event_whenbroadcastreceived', {
+                'BROADCAST_OPTION': broadcastOption
+            }
+        );
+        if (util.stackFrame.startedThreads.length == 0) {
+            // Nothing was started.
+            return;
+        }
+    }
+    // We've run before; check if the wait is still going on.
+    var instance = this;
+    var waiting = util.stackFrame.startedThreads.some(function(thread) {
+        return instance.runtime.isActiveThread(thread);
+    });
+    if (waiting) {
+        util.yield();
+    }
+};
+
+module.exports = Scratch3EventBlocks;
diff --git a/src/blocks/scratch3_looks.js b/src/blocks/scratch3_looks.js
new file mode 100644
index 000000000..a1d433e94
--- /dev/null
+++ b/src/blocks/scratch3_looks.js
@@ -0,0 +1,221 @@
+var Cast = require('../util/cast');
+
+function Scratch3LooksBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3LooksBlocks.prototype.getPrimitives = function() {
+    return {
+        'looks_say': this.say,
+        'looks_sayforsecs': this.sayforsecs,
+        'looks_think': this.think,
+        'looks_thinkforsecs': this.sayforsecs,
+        'looks_show': this.show,
+        'looks_hide': this.hide,
+        'looks_switchcostumeto': this.switchCostume,
+        'looks_switchbackdropto': this.switchBackdrop,
+        'looks_switchbackdroptoandwait': this.switchBackdropAndWait,
+        'looks_nextcostume': this.nextCostume,
+        'looks_nextbackdrop': this.nextBackdrop,
+        'looks_changeeffectby': this.changeEffect,
+        'looks_seteffectto': this.setEffect,
+        'looks_cleargraphiceffects': this.clearEffects,
+        'looks_changesizeby': this.changeSize,
+        'looks_setsizeto': this.setSize,
+        'looks_gotofront': this.goToFront,
+        'looks_gobacklayers': this.goBackLayers,
+        'looks_size': this.getSize,
+        'looks_costumeorder': this.getCostumeIndex,
+        'looks_backdroporder': this.getBackdropIndex,
+        'looks_backdropname': this.getBackdropName
+    };
+};
+
+Scratch3LooksBlocks.prototype.say = function (args, util) {
+    util.target.setSay('say', args.MESSAGE);
+};
+
+Scratch3LooksBlocks.prototype.sayforsecs = function (args, util) {
+    util.target.setSay('say', args.MESSAGE);
+    return new Promise(function(resolve) {
+        setTimeout(function() {
+            // Clear say bubble and proceed.
+            util.target.setSay();
+            resolve();
+        }, 1000 * args.SECS);
+    });
+};
+
+Scratch3LooksBlocks.prototype.think = function (args, util) {
+    util.target.setSay('think', args.MESSAGE);
+};
+
+Scratch3LooksBlocks.prototype.thinkforsecs = function (args, util) {
+    util.target.setSay('think', args.MESSAGE);
+    return new Promise(function(resolve) {
+        setTimeout(function() {
+            // Clear say bubble and proceed.
+            util.target.setSay();
+            resolve();
+        }, 1000 * args.SECS);
+    });
+};
+
+Scratch3LooksBlocks.prototype.show = function (args, util) {
+    util.target.setVisible(true);
+};
+
+Scratch3LooksBlocks.prototype.hide = function (args, util) {
+    util.target.setVisible(false);
+};
+
+/**
+ * Utility function to set the costume or backdrop of a target.
+ * Matches the behavior of Scratch 2.0 for different types of arguments.
+ * @param {!Target} target Target to set costume/backdrop to.
+ * @param {Any} requestedCostume Costume requested, e.g., 0, 'name', etc.
+ * @param {boolean=} opt_zeroIndex Set to zero-index the requestedCostume.
+ * @return {Array.<!Thread>} Any threads started by this switch.
+ */
+Scratch3LooksBlocks.prototype._setCostumeOrBackdrop = function (target,
+        requestedCostume, opt_zeroIndex) {
+    if (typeof requestedCostume === 'number') {
+        target.setCostume(opt_zeroIndex ?
+            requestedCostume : requestedCostume - 1);
+    } else {
+        var costumeIndex = target.getCostumeIndexByName(requestedCostume);
+        if (costumeIndex > -1) {
+            target.setCostume(costumeIndex);
+        } else if (costumeIndex == 'previous costume' ||
+                   costumeIndex == 'previous backdrop') {
+            target.setCostume(target.currentCostume - 1);
+        } else if (costumeIndex == 'next costume' ||
+                   costumeIndex == 'next backdrop') {
+            target.setCostume(target.currentCostume + 1);
+        } else {
+            var forcedNumber = Cast.toNumber(requestedCostume);
+            if (!isNaN(forcedNumber)) {
+                target.setCostume(opt_zeroIndex ?
+                    forcedNumber : forcedNumber - 1);
+            }
+        }
+    }
+    if (target == this.runtime.getTargetForStage()) {
+        // Target is the stage - start hats.
+        var newName = target.sprite.costumes[target.currentCostume].name;
+        return this.runtime.startHats('event_whenbackdropswitchesto', {
+            'BACKDROP': newName
+        });
+    }
+    return [];
+};
+
+Scratch3LooksBlocks.prototype.switchCostume = function (args, util) {
+    this._setCostumeOrBackdrop(util.target, args.COSTUME);
+};
+
+Scratch3LooksBlocks.prototype.nextCostume = function (args, util) {
+    this._setCostumeOrBackdrop(
+        util.target, util.target.currentCostume + 1, true
+    );
+};
+
+Scratch3LooksBlocks.prototype.switchBackdrop = function (args) {
+    this._setCostumeOrBackdrop(this.runtime.getTargetForStage(), args.BACKDROP);
+};
+
+Scratch3LooksBlocks.prototype.switchBackdropAndWait = function (args, util) {
+    // Have we run before, starting threads?
+    if (!util.stackFrame.startedThreads) {
+        // No - switch the backdrop.
+        util.stackFrame.startedThreads = (
+            this._setCostumeOrBackdrop(
+                this.runtime.getTargetForStage(),
+                args.BACKDROP
+            )
+        );
+        if (util.stackFrame.startedThreads.length == 0) {
+            // Nothing was started.
+            return;
+        }
+    }
+    // We've run before; check if the wait is still going on.
+    var instance = this;
+    var waiting = util.stackFrame.startedThreads.some(function(thread) {
+        return instance.runtime.isActiveThread(thread);
+    });
+    if (waiting) {
+        util.yield();
+    }
+};
+
+Scratch3LooksBlocks.prototype.nextBackdrop = function () {
+    var stage = this.runtime.getTargetForStage();
+    this._setCostumeOrBackdrop(
+        stage, stage.currentCostume + 1, true
+    );
+};
+
+Scratch3LooksBlocks.prototype.changeEffect = function (args, util) {
+    var effect = Cast.toString(args.EFFECT).toLowerCase();
+    var change = Cast.toNumber(args.CHANGE);
+    if (!util.target.effects.hasOwnProperty(effect)) return;
+    var newValue = change + util.target.effects[effect];
+    util.target.setEffect(effect, newValue);
+};
+
+Scratch3LooksBlocks.prototype.setEffect = function (args, util) {
+    var effect = Cast.toString(args.EFFECT).toLowerCase();
+    var value = Cast.toNumber(args.VALUE);
+    util.target.setEffect(effect, value);
+};
+
+Scratch3LooksBlocks.prototype.clearEffects = function (args, util) {
+    util.target.clearEffects();
+};
+
+Scratch3LooksBlocks.prototype.changeSize = function (args, util) {
+    var change = Cast.toNumber(args.CHANGE);
+    util.target.setSize(util.target.size + change);
+};
+
+Scratch3LooksBlocks.prototype.setSize = function (args, util) {
+    var size = Cast.toNumber(args.SIZE);
+    util.target.setSize(size);
+};
+
+Scratch3LooksBlocks.prototype.goToFront = function (args, util) {
+    util.target.goToFront();
+};
+
+Scratch3LooksBlocks.prototype.goBackLayers = function (args, util) {
+    util.target.goBackLayers(args.NUM);
+};
+
+Scratch3LooksBlocks.prototype.getSize = function (args, util) {
+    return util.target.size;
+};
+
+Scratch3LooksBlocks.prototype.getBackdropIndex = function () {
+    var stage = this.runtime.getTargetForStage();
+    return stage.currentCostume + 1;
+};
+
+Scratch3LooksBlocks.prototype.getBackdropName = function () {
+    var stage = this.runtime.getTargetForStage();
+    return stage.sprite.costumes[stage.currentCostume].name;
+};
+
+Scratch3LooksBlocks.prototype.getCostumeIndex = function (args, util) {
+    return util.target.currentCostume + 1;
+};
+
+module.exports = Scratch3LooksBlocks;
diff --git a/src/blocks/scratch3_motion.js b/src/blocks/scratch3_motion.js
new file mode 100644
index 000000000..68078578b
--- /dev/null
+++ b/src/blocks/scratch3_motion.js
@@ -0,0 +1,234 @@
+var Cast = require('../util/cast');
+var MathUtil = require('../util/math-util');
+var Timer = require('../util/timer');
+
+function Scratch3MotionBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3MotionBlocks.prototype.getPrimitives = function() {
+    return {
+        'motion_movesteps': this.moveSteps,
+        'motion_gotoxy': this.goToXY,
+        'motion_goto': this.goTo,
+        'motion_turnright': this.turnRight,
+        'motion_turnleft': this.turnLeft,
+        'motion_pointindirection': this.pointInDirection,
+        'motion_pointtowards': this.pointTowards,
+        'motion_glidesecstoxy': this.glide,
+        'motion_ifonedgebounce': this.ifOnEdgeBounce,
+        'motion_setrotationstyle': this.setRotationStyle,
+        'motion_changexby': this.changeX,
+        'motion_setx': this.setX,
+        'motion_changeyby': this.changeY,
+        'motion_sety': this.setY,
+        'motion_xposition': this.getX,
+        'motion_yposition': this.getY,
+        'motion_direction': this.getDirection
+    };
+};
+
+Scratch3MotionBlocks.prototype.moveSteps = function (args, util) {
+    var steps = Cast.toNumber(args.STEPS);
+    var radians = MathUtil.degToRad(90 - util.target.direction);
+    var dx = steps * Math.cos(radians);
+    var dy = steps * Math.sin(radians);
+    util.target.setXY(util.target.x + dx, util.target.y + dy);
+};
+
+Scratch3MotionBlocks.prototype.goToXY = function (args, util) {
+    var x = Cast.toNumber(args.X);
+    var y = Cast.toNumber(args.Y);
+    util.target.setXY(x, y);
+};
+
+Scratch3MotionBlocks.prototype.goTo = function (args, util) {
+    var targetX = 0;
+    var targetY = 0;
+    if (args.TO === '_mouse_') {
+        targetX = util.ioQuery('mouse', 'getX');
+        targetY = util.ioQuery('mouse', 'getY');
+    } else if (args.TO === '_random_') {
+        var stageWidth = this.runtime.constructor.STAGE_WIDTH;
+        var stageHeight = this.runtime.constructor.STAGE_HEIGHT;
+        targetX = Math.round(stageWidth * (Math.random() - 0.5));
+        targetY = Math.round(stageHeight * (Math.random() - 0.5));
+    } else {
+        var goToTarget = this.runtime.getSpriteTargetByName(args.TO);
+        if (!goToTarget) return;
+        targetX = goToTarget.x;
+        targetY = goToTarget.y;
+    }
+    util.target.setXY(targetX, targetY);
+};
+
+Scratch3MotionBlocks.prototype.turnRight = function (args, util) {
+    var degrees = Cast.toNumber(args.DEGREES);
+    util.target.setDirection(util.target.direction + degrees);
+};
+
+Scratch3MotionBlocks.prototype.turnLeft = function (args, util) {
+    var degrees = Cast.toNumber(args.DEGREES);
+    util.target.setDirection(util.target.direction - degrees);
+};
+
+Scratch3MotionBlocks.prototype.pointInDirection = function (args, util) {
+    var direction = Cast.toNumber(args.DIRECTION);
+    util.target.setDirection(direction);
+};
+
+Scratch3MotionBlocks.prototype.pointTowards = function (args, util) {
+    var targetX = 0;
+    var targetY = 0;
+    if (args.TOWARDS === '_mouse_') {
+        targetX = util.ioQuery('mouse', 'getX');
+        targetY = util.ioQuery('mouse', 'getY');
+    } else {
+        var pointTarget = this.runtime.getSpriteTargetByName(args.TOWARDS);
+        if (!pointTarget) return;
+        targetX = pointTarget.x;
+        targetY = pointTarget.y;
+    }
+
+    var dx = targetX - util.target.x;
+    var dy = targetY - util.target.y;
+    var direction = 90 - MathUtil.radToDeg(Math.atan2(dy, dx));
+    util.target.setDirection(direction);
+};
+
+Scratch3MotionBlocks.prototype.glide = function (args, util) {
+    if (!util.stackFrame.timer) {
+        // First time: save data for future use.
+        util.stackFrame.timer = new Timer();
+        util.stackFrame.timer.start();
+        util.stackFrame.duration = Cast.toNumber(args.SECS);
+        util.stackFrame.startX = util.target.x;
+        util.stackFrame.startY = util.target.y;
+        util.stackFrame.endX = Cast.toNumber(args.X);
+        util.stackFrame.endY = Cast.toNumber(args.Y);
+        if (util.stackFrame.duration <= 0) {
+            // Duration too short to glide.
+            util.target.setXY(util.stackFrame.endX, util.stackFrame.endY);
+            return;
+        }
+        util.yield();
+    } else {
+        var timeElapsed = util.stackFrame.timer.timeElapsed();
+        if (timeElapsed < util.stackFrame.duration * 1000) {
+            // In progress: move to intermediate position.
+            var frac = timeElapsed / (util.stackFrame.duration * 1000);
+            var dx = frac * (util.stackFrame.endX - util.stackFrame.startX);
+            var dy = frac * (util.stackFrame.endY - util.stackFrame.startY);
+            util.target.setXY(
+                util.stackFrame.startX + dx,
+                util.stackFrame.startY + dy
+            );
+            util.yield();
+        } else {
+            // Finished: move to final position.
+            util.target.setXY(util.stackFrame.endX, util.stackFrame.endY);
+        }
+    }
+};
+
+Scratch3MotionBlocks.prototype.ifOnEdgeBounce = function (args, util) {
+    var bounds = util.target.getBounds();
+    if (!bounds) {
+        return;
+    }
+    // Measure distance to edges.
+    // Values are positive when the sprite is far away,
+    // and clamped to zero when the sprite is beyond.
+    var stageWidth = this.runtime.constructor.STAGE_WIDTH;
+    var stageHeight = this.runtime.constructor.STAGE_HEIGHT;
+    var distLeft = Math.max(0, stageWidth / 2 + bounds.left);
+    var distTop = Math.max(0, stageHeight / 2 - bounds.top);
+    var distRight = Math.max(0, stageWidth / 2 - bounds.right);
+    var distBottom = Math.max(0, stageHeight / 2 + bounds.bottom);
+    // Find the nearest edge.
+    var nearestEdge = '';
+    var minDist = Infinity;
+    if (distLeft < minDist) {
+        minDist = distLeft;
+        nearestEdge = 'left';
+    }
+    if (distTop < minDist) {
+        minDist = distTop;
+        nearestEdge = 'top';
+    }
+    if (distRight < minDist) {
+        minDist = distRight;
+        nearestEdge = 'right';
+    }
+    if (distBottom < minDist) {
+        minDist = distBottom;
+        nearestEdge = 'bottom';
+    }
+    if (minDist > 0) {
+        return; // Not touching any edge.
+    }
+    // Point away from the nearest edge.
+    var radians = MathUtil.degToRad(90 - util.target.direction);
+    var dx = Math.cos(radians);
+    var dy = -Math.sin(radians);
+    if (nearestEdge == 'left') {
+        dx = Math.max(0.2, Math.abs(dx));
+    } else if (nearestEdge == 'top') {
+        dy = Math.max(0.2, Math.abs(dy));
+    } else if (nearestEdge == 'right') {
+        dx = 0 - Math.max(0.2, Math.abs(dx));
+    } else if (nearestEdge == 'bottom') {
+        dy = 0 - Math.max(0.2, Math.abs(dy));
+    }
+    var newDirection = MathUtil.radToDeg(Math.atan2(dy, dx)) + 90;
+    util.target.setDirection(newDirection);
+    // Keep within the stage.
+    var fencedPosition = util.target.keepInFence(util.target.x, util.target.y);
+    util.target.setXY(fencedPosition[0], fencedPosition[1]);
+};
+
+Scratch3MotionBlocks.prototype.setRotationStyle = function (args, util) {
+    util.target.setRotationStyle(args.STYLE);
+};
+
+Scratch3MotionBlocks.prototype.changeX = function (args, util) {
+    var dx = Cast.toNumber(args.DX);
+    util.target.setXY(util.target.x + dx, util.target.y);
+};
+
+Scratch3MotionBlocks.prototype.setX = function (args, util) {
+    var x = Cast.toNumber(args.X);
+    util.target.setXY(x, util.target.y);
+};
+
+Scratch3MotionBlocks.prototype.changeY = function (args, util) {
+    var dy = Cast.toNumber(args.DY);
+    util.target.setXY(util.target.x, util.target.y + dy);
+};
+
+Scratch3MotionBlocks.prototype.setY = function (args, util) {
+    var y = Cast.toNumber(args.Y);
+    util.target.setXY(util.target.x, y);
+};
+
+Scratch3MotionBlocks.prototype.getX = function (args, util) {
+    return util.target.x;
+};
+
+Scratch3MotionBlocks.prototype.getY = function (args, util) {
+    return util.target.y;
+};
+
+Scratch3MotionBlocks.prototype.getDirection = function (args, util) {
+    return util.target.direction;
+};
+
+module.exports = Scratch3MotionBlocks;
diff --git a/src/blocks/scratch3_operators.js b/src/blocks/scratch3_operators.js
new file mode 100644
index 000000000..0d5531778
--- /dev/null
+++ b/src/blocks/scratch3_operators.js
@@ -0,0 +1,143 @@
+var Cast = require('../util/cast.js');
+
+function Scratch3OperatorsBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3OperatorsBlocks.prototype.getPrimitives = function() {
+    return {
+        'operator_add': this.add,
+        'operator_subtract': this.subtract,
+        'operator_multiply': this.multiply,
+        'operator_divide': this.divide,
+        'operator_lt': this.lt,
+        'operator_equals': this.equals,
+        'operator_gt': this.gt,
+        'operator_and': this.and,
+        'operator_or': this.or,
+        'operator_not': this.not,
+        'operator_random': this.random,
+        'operator_join': this.join,
+        'operator_letter_of': this.letterOf,
+        'operator_length': this.length,
+        'operator_mod': this.mod,
+        'operator_round': this.round,
+        'operator_mathop': this.mathop
+    };
+};
+
+Scratch3OperatorsBlocks.prototype.add = function (args) {
+    return Cast.toNumber(args.NUM1) + Cast.toNumber(args.NUM2);
+};
+
+Scratch3OperatorsBlocks.prototype.subtract = function (args) {
+    return Cast.toNumber(args.NUM1) - Cast.toNumber(args.NUM2);
+};
+
+Scratch3OperatorsBlocks.prototype.multiply = function (args) {
+    return Cast.toNumber(args.NUM1) * Cast.toNumber(args.NUM2);
+};
+
+Scratch3OperatorsBlocks.prototype.divide = function (args) {
+    return Cast.toNumber(args.NUM1) / Cast.toNumber(args.NUM2);
+};
+
+Scratch3OperatorsBlocks.prototype.lt = function (args) {
+    return Cast.compare(args.OPERAND1, args.OPERAND2) < 0;
+};
+
+Scratch3OperatorsBlocks.prototype.equals = function (args) {
+    return Cast.compare(args.OPERAND1, args.OPERAND2) == 0;
+};
+
+Scratch3OperatorsBlocks.prototype.gt = function (args) {
+    return Cast.compare(args.OPERAND1, args.OPERAND2) > 0;
+};
+
+Scratch3OperatorsBlocks.prototype.and = function (args) {
+    return Cast.toBoolean(args.OPERAND1) && Cast.toBoolean(args.OPERAND2);
+};
+
+Scratch3OperatorsBlocks.prototype.or = function (args) {
+    return Cast.toBoolean(args.OPERAND1) || Cast.toBoolean(args.OPERAND2);
+};
+
+Scratch3OperatorsBlocks.prototype.not = function (args) {
+    return !Cast.toBoolean(args.OPERAND);
+};
+
+Scratch3OperatorsBlocks.prototype.random = function (args) {
+    var nFrom = Cast.toNumber(args.FROM);
+    var nTo = Cast.toNumber(args.TO);
+    var low = nFrom <= nTo ? nFrom : nTo;
+    var high = nFrom <= nTo ? nTo : nFrom;
+    if (low == high) return low;
+    // If both arguments are ints, truncate the result to an int.
+    if (Cast.isInt(args.FROM) && Cast.isInt(args.TO)) {
+        return low + parseInt(Math.random() * ((high + 1) - low));
+    }
+    return (Math.random() * (high - low)) + low;
+};
+
+Scratch3OperatorsBlocks.prototype.join = function (args) {
+    return Cast.toString(args.STRING1) + Cast.toString(args.STRING2);
+};
+
+Scratch3OperatorsBlocks.prototype.letterOf = function (args) {
+    var index = Cast.toNumber(args.LETTER) - 1;
+    var str = Cast.toString(args.STRING);
+    // Out of bounds?
+    if (index < 0 || index >= str.length) {
+        return '';
+    }
+    return str.charAt(index);
+};
+
+Scratch3OperatorsBlocks.prototype.length = function (args) {
+    return Cast.toString(args.STRING).length;
+};
+
+Scratch3OperatorsBlocks.prototype.mod = function (args) {
+    var n = Cast.toNumber(args.NUM1);
+    var modulus = Cast.toNumber(args.NUM2);
+    var result = n % modulus;
+    // Scratch mod is kept positive.
+    if (result / modulus < 0) result += modulus;
+    return result;
+};
+
+Scratch3OperatorsBlocks.prototype.round = function (args) {
+    return Math.round(Cast.toNumber(args.NUM));
+};
+
+Scratch3OperatorsBlocks.prototype.mathop = function (args) {
+    var operator = Cast.toString(args.OPERATOR).toLowerCase();
+    var n = Cast.toNumber(args.NUM);
+    switch (operator) {
+    case 'abs': return Math.abs(n);
+    case 'floor': return Math.floor(n);
+    case 'ceiling': return Math.ceil(n);
+    case 'sqrt': return Math.sqrt(n);
+    case 'sin': return Math.sin((Math.PI * n) / 180);
+    case 'cos': return Math.cos((Math.PI * n) / 180);
+    case 'tan': return Math.tan((Math.PI * n) / 180);
+    case 'asin': return (Math.asin(n) * 180) / Math.PI;
+    case 'acos': return (Math.acos(n) * 180) / Math.PI;
+    case 'atan': return (Math.atan(n) * 180) / Math.PI;
+    case 'ln': return Math.log(n);
+    case 'log': return Math.log(n) / Math.LN10;
+    case 'e ^': return Math.exp(n);
+    case '10 ^': return Math.pow(10, n);
+    }
+    return 0;
+};
+
+module.exports = Scratch3OperatorsBlocks;
diff --git a/src/blocks/scratch3_procedures.js b/src/blocks/scratch3_procedures.js
new file mode 100644
index 000000000..19a6df370
--- /dev/null
+++ b/src/blocks/scratch3_procedures.js
@@ -0,0 +1,44 @@
+function Scratch3ProcedureBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3ProcedureBlocks.prototype.getPrimitives = function() {
+    return {
+        'procedures_defnoreturn': this.defNoReturn,
+        'procedures_callnoreturn': this.callNoReturn,
+        'procedures_param': this.param
+    };
+};
+
+Scratch3ProcedureBlocks.prototype.defNoReturn = function () {
+    // No-op: execute the blocks.
+};
+
+Scratch3ProcedureBlocks.prototype.callNoReturn = function (args, util) {
+    if (!util.stackFrame.executed) {
+        var procedureCode = args.mutation.proccode;
+        var paramNames = util.getProcedureParamNames(procedureCode);
+        for (var i = 0; i < paramNames.length; i++) {
+            if (args.hasOwnProperty('input' + i)) {
+                util.pushParam(paramNames[i], args['input' + i]);
+            }
+        }
+        util.stackFrame.executed = true;
+        util.startProcedure(procedureCode);
+    }
+};
+
+Scratch3ProcedureBlocks.prototype.param = function (args, util) {
+    var value = util.getParam(args.mutation.paramname);
+    return value;
+};
+
+module.exports = Scratch3ProcedureBlocks;
diff --git a/src/blocks/scratch3_sensing.js b/src/blocks/scratch3_sensing.js
new file mode 100644
index 000000000..293273936
--- /dev/null
+++ b/src/blocks/scratch3_sensing.js
@@ -0,0 +1,128 @@
+var Cast = require('../util/cast');
+
+function Scratch3SensingBlocks(runtime) {
+    /**
+     * The runtime instantiating this block package.
+     * @type {Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Retrieve the block primitives implemented by this package.
+ * @return {Object.<string, Function>} Mapping of opcode to Function.
+ */
+Scratch3SensingBlocks.prototype.getPrimitives = function() {
+    return {
+        'sensing_touchingobject': this.touchingObject,
+        'sensing_touchingcolor': this.touchingColor,
+        'sensing_coloristouchingcolor': this.colorTouchingColor,
+        'sensing_distanceto': this.distanceTo,
+        'sensing_timer': this.getTimer,
+        'sensing_resettimer': this.resetTimer,
+        'sensing_mousex': this.getMouseX,
+        'sensing_mousey': this.getMouseY,
+        'sensing_mousedown': this.getMouseDown,
+        'sensing_keypressed': this.getKeyPressed,
+        'sensing_current': this.current,
+        'sensing_dayssince2000': this.daysSince2000
+    };
+};
+
+Scratch3SensingBlocks.prototype.touchingObject = function (args, util) {
+    var requestedObject = args.TOUCHINGOBJECTMENU;
+    if (requestedObject == '_mouse_') {
+        var mouseX = util.ioQuery('mouse', 'getX');
+        var mouseY = util.ioQuery('mouse', 'getY');
+        return util.target.isTouchingPoint(mouseX, mouseY);
+    } else if (requestedObject == '_edge_') {
+        return util.target.isTouchingEdge();
+    } else {
+        return util.target.isTouchingSprite(requestedObject);
+    }
+};
+
+Scratch3SensingBlocks.prototype.touchingColor = function (args, util) {
+    var color = Cast.toRgbColorList(args.COLOR);
+    return util.target.isTouchingColor(color);
+};
+
+Scratch3SensingBlocks.prototype.colorTouchingColor = function (args, util) {
+    var maskColor = Cast.toRgbColorList(args.COLOR);
+    var targetColor = Cast.toRgbColorList(args.COLOR2);
+    return util.target.colorIsTouchingColor(targetColor, maskColor);
+};
+
+Scratch3SensingBlocks.prototype.distanceTo = function (args, util) {
+    if (util.target.isStage) return 10000;
+
+    var targetX = 0;
+    var targetY = 0;
+    if (args.DISTANCETOMENU === '_mouse_') {
+        targetX = util.ioQuery('mouse', 'getX');
+        targetY = util.ioQuery('mouse', 'getY');
+    } else {
+        var distTarget = this.runtime.getSpriteTargetByName(
+            args.DISTANCETOMENU
+        );
+        if (!distTarget) return 10000;
+        targetX = distTarget.x;
+        targetY = distTarget.y;
+    }
+
+    var dx = util.target.x - targetX;
+    var dy = util.target.y - targetY;
+    return Math.sqrt((dx * dx) + (dy * dy));
+};
+
+Scratch3SensingBlocks.prototype.getTimer = function (args, util) {
+    return util.ioQuery('clock', 'projectTimer');
+};
+
+Scratch3SensingBlocks.prototype.resetTimer = function (args, util) {
+    util.ioQuery('clock', 'resetProjectTimer');
+};
+
+Scratch3SensingBlocks.prototype.getMouseX = function (args, util) {
+    return util.ioQuery('mouse', 'getX');
+};
+
+Scratch3SensingBlocks.prototype.getMouseY = function (args, util) {
+    return util.ioQuery('mouse', 'getY');
+};
+
+Scratch3SensingBlocks.prototype.getMouseDown = function (args, util) {
+    return util.ioQuery('mouse', 'getIsDown');
+};
+
+Scratch3SensingBlocks.prototype.current = function (args) {
+    var menuOption = Cast.toString(args.CURRENTMENU).toLowerCase();
+    var date = new Date();
+    switch (menuOption) {
+    case 'year': return date.getFullYear();
+    case 'month': return date.getMonth() + 1; // getMonth is zero-based
+    case 'date': return date.getDate();
+    case 'dayofweek': return date.getDay() + 1; // getDay is zero-based, Sun=0
+    case 'hour': return date.getHours();
+    case 'minute': return date.getMinutes();
+    case 'second': return date.getSeconds();
+    }
+    return 0;
+};
+
+Scratch3SensingBlocks.prototype.getKeyPressed = function (args, util) {
+    return util.ioQuery('keyboard', 'getKeyIsDown', args.KEY_OPTION);
+};
+
+Scratch3SensingBlocks.prototype.daysSince2000 = function()
+{
+    var msPerDay = 24 * 60 * 60 * 1000;
+    var start = new Date(2000, 1-1, 1); 
+    var today = new Date(); 
+    var dstAdjust = today.getTimezoneOffset() - start.getTimezoneOffset();
+    var mSecsSinceStart = today.valueOf() - start.valueOf();
+    mSecsSinceStart += ((today.getTimezoneOffset() - dstAdjust) * 60 * 1000);
+    return mSecsSinceStart / msPerDay;
+};
+
+module.exports = Scratch3SensingBlocks;
diff --git a/src/blocks/wedo2.js b/src/blocks/wedo2.js
deleted file mode 100644
index 86c73de07..000000000
--- a/src/blocks/wedo2.js
+++ /dev/null
@@ -1,154 +0,0 @@
-
-var YieldTimers = require('../util/yieldtimers.js');
-
-function WeDo2Blocks(runtime) {
-    /**
-     * The runtime instantiating this block package.
-     * @type {Runtime}
-     */
-    this.runtime = runtime;
-
-    /**
-     * Current motor speed, as a percentage (100 = full speed).
-     * @type {number}
-     * @private
-     */
-    this._motorSpeed = 100;
-
-    /**
-     * The timeout ID for a pending motor action.
-     * @type {?int}
-     * @private
-     */
-    this._motorTimeout = null;
-}
-
-/**
- * Retrieve the block primitives implemented by this package.
- * @return {Object.<string, Function>} Mapping of opcode to Function.
- */
-WeDo2Blocks.prototype.getPrimitives = function() {
-    return {
-        'wedo_motorclockwise': this.motorClockwise,
-        'wedo_motorcounterclockwise': this.motorCounterClockwise,
-        'wedo_motorspeed': this.motorSpeed,
-        'wedo_setcolor': this.setColor,
-        'wedo_whendistanceclose': this.whenDistanceClose,
-        'wedo_whentilt': this.whenTilt
-    };
-};
-
-/**
- * Clamp a value between a minimum and maximum value.
- * @todo move this to a common utility class.
- * @param val The value to clamp.
- * @param min The minimum return value.
- * @param max The maximum return value.
- * @returns {number} The clamped value.
- * @private
- */
-WeDo2Blocks.prototype._clamp = function(val, min, max) {
-    return Math.max(min, Math.min(val, max));
-};
-
-/**
- * Common implementation for motor blocks.
- * @param direction The direction to turn ('left' or 'right').
- * @param durationSeconds The number of seconds to run.
- * @param util The util instance to use for yielding and finishing.
- * @private
- */
-WeDo2Blocks.prototype._motorOnFor = function(direction, durationSeconds, util) {
-    if (this._motorTimeout > 0) {
-        // @todo maybe this should go through util
-        YieldTimers.resolve(this._motorTimeout);
-        this._motorTimeout = null;
-    }
-    if (window.native) {
-        window.native.motorRun(direction, this._motorSpeed);
-    }
-
-    var instance = this;
-    var myTimeout = this._motorTimeout = util.timeout(function() {
-        if (instance._motorTimeout == myTimeout) {
-            instance._motorTimeout = null;
-        }
-        if (window.native) {
-            window.native.motorStop();
-        }
-        util.done();
-    }, 1000 * durationSeconds);
-
-    util.yield();
-};
-
-WeDo2Blocks.prototype.motorClockwise = function(argValues, util) {
-    this._motorOnFor('right', parseFloat(argValues[0]), util);
-};
-
-WeDo2Blocks.prototype.motorCounterClockwise = function(argValues, util) {
-    this._motorOnFor('left', parseFloat(argValues[0]), util);
-};
-
-WeDo2Blocks.prototype.motorSpeed = function(argValues) {
-    var speed = argValues[0];
-    switch (speed) {
-    case 'slow':
-        this._motorSpeed = 20;
-        break;
-    case 'medium':
-        this._motorSpeed = 50;
-        break;
-    case 'fast':
-        this._motorSpeed = 100;
-        break;
-    }
-};
-
-/**
- * Convert a color name to a WeDo color index.
- * Supports 'mystery' for a random hue.
- * @param colorName The color to retrieve.
- * @returns {number} The WeDo color index.
- * @private
- */
-WeDo2Blocks.prototype._getColor = function(colorName) {
-    var colors = {
-        'yellow': 7,
-        'orange': 8,
-        'coral': 9,
-        'magenta': 1,
-        'purple': 2,
-        'blue': 3,
-        'green': 6,
-        'white': 10
-    };
-
-    if (colorName == 'mystery') {
-        return Math.floor((Math.random() * 10) + 1);
-    }
-
-    return colors[colorName];
-};
-
-WeDo2Blocks.prototype.setColor = function(argValues, util) {
-    if (window.native) {
-        var colorIndex = this._getColor(argValues[0]);
-        window.native.setLedColor(colorIndex);
-    }
-    // Pause for quarter second
-    util.yield();
-    util.timeout(function() {
-        util.done();
-    }, 250);
-};
-
-WeDo2Blocks.prototype.whenDistanceClose = function() {
-    console.log('Running: wedo_whendistanceclose');
-};
-
-WeDo2Blocks.prototype.whenTilt = function() {
-    console.log('Running: wedo_whentilt');
-};
-
-module.exports = WeDo2Blocks;
diff --git a/src/engine/adapter.js b/src/engine/adapter.js
index 222273c5c..327aae5e3 100644
--- a/src/engine/adapter.js
+++ b/src/engine/adapter.js
@@ -1,87 +1,147 @@
+var mutationAdapter = require('./mutation-adapter');
 var html = require('htmlparser2');
-var memoize = require('memoizee');
-var parseDOM = memoize(html.parseDOM, {
-    length: 1,
-    resolvers: [String],
-    max: 200
-});
 
 /**
  * Adapter between block creation events and block representation which can be
  * used by the Scratch runtime.
- *
- * @param {Object} `Blockly.events.create`
- *
- * @return {Object}
+ * @param {Object} e `Blockly.events.create`
+ * @return {Array.<Object>} List of blocks from this CREATE event.
  */
 module.exports = function (e) {
     // Validate input
     if (typeof e !== 'object') return;
-    if (typeof e.blockId !== 'string') return;
     if (typeof e.xml !== 'object') return;
 
-    // Storage object
-    var obj = {
-        id: e.blockId,
-        opcode: null,
-        next: null,
-        fields: {}
-    };
-
-    // Set opcode
-    if (typeof e.xml.attributes === 'object') {
-        obj.opcode = e.xml.attributes.type.value;
-    }
-
-    // Extract fields from event's `innerHTML`
-    if (typeof e.xml.innerHTML !== 'string') return obj;
-    if (e.xml.innerHTML === '') return obj;
-    obj.fields = extract(parseDOM(e.xml.innerHTML));
-
-    return obj;
+    return domToBlocks(html.parseDOM(e.xml.outerHTML));
 };
 
 /**
- * Extracts fields from a block's innerHTML.
- * @todo Extend this to support vertical grammar / nested blocks.
- *
- * @param {Object} DOM representation of block's innerHTML
- *
- * @return {Object}
+ * Convert outer blocks DOM from a Blockly CREATE event
+ * to a usable form for the Scratch runtime.
+ * This structure is based on Blockly xml.js:`domToWorkspace` and `domToBlock`.
+ * @param {Element} blocksDOM DOM tree for this event.
+ * @return {Array.<Object>} Usable list of blocks from this CREATE event.
  */
-function extract (dom) {
-    // Storage object
-    var fields = {};
-
-    // Field
-    var field = dom[0];
-    var fieldName = field.attribs.name;
-    fields[fieldName] = {
-        name: fieldName,
-        value: null,
-        blocks: {}
-    };
-
-    // Shadow block
-    var shadow = field.children[0];
-    var shadowId = shadow.attribs.id;
-    var shadowOpcode = shadow.attribs.type;
-    fields[fieldName].blocks[shadowId] = {
-        id: shadowId,
-        opcode: shadowOpcode,
-        next: null,
-        fields: {}
-    };
-
-    // Primitive
-    var primitive = shadow.children[0];
-    var primitiveName = primitive.attribs.name;
-    var primitiveValue = primitive.children[0].data;
-    fields[fieldName].blocks[shadowId].fields[primitiveName] = {
-        name: primitiveName,
-        value: primitiveValue,
-        blocks: null
-    };
-
-    return fields;
+function domToBlocks (blocksDOM) {
+    // At this level, there could be multiple blocks adjacent in the DOM tree.
+    var blocks = {};
+    for (var i = 0; i < blocksDOM.length; i++) {
+        var block = blocksDOM[i];
+        if (!block.name || !block.attribs) {
+            continue;
+        }
+        var tagName = block.name.toLowerCase();
+        if (tagName == 'block' || tagName == 'shadow') {
+            domToBlock(block, blocks, true, null);
+        }
+    }
+    // Flatten blocks object into a list.
+    var blocksList = [];
+    for (var b in blocks) {
+        blocksList.push(blocks[b]);
+    }
+    return blocksList;
+}
+
+/**
+ * Convert and an individual block DOM to the representation tree.
+ * Based on Blockly's `domToBlockHeadless_`.
+ * @param {Element} blockDOM DOM tree for an individual block.
+ * @param {Object} blocks Collection of blocks to add to.
+ * @param {Boolean} isTopBlock Whether blocks at this level are "top blocks."
+ * @param {?string} parent Parent block ID.
+ */
+function domToBlock (blockDOM, blocks, isTopBlock, parent) {
+    // Block skeleton.
+    var block = {
+        id: blockDOM.attribs.id, // Block ID
+        opcode: blockDOM.attribs.type, // For execution, "event_whengreenflag".
+        inputs: {}, // Inputs to this block and the blocks they point to.
+        fields: {}, // Fields on this block and their values.
+        next: null, // Next block in the stack, if one exists.
+        topLevel: isTopBlock, // If this block starts a stack.
+        parent: parent, // Parent block ID, if available.
+        shadow: blockDOM.name == 'shadow', // If this represents a shadow/slot.
+        x: blockDOM.attribs.x, // X position of script, if top-level.
+        y: blockDOM.attribs.y // Y position of script, if top-level.
+    };
+
+    // Add the block to the representation tree.
+    blocks[block.id] = block;
+
+    // Process XML children and find enclosed blocks, fields, etc.
+    for (var i = 0; i < blockDOM.children.length; i++) {
+        var xmlChild = blockDOM.children[i];
+        // Enclosed blocks and shadows
+        var childBlockNode = null;
+        var childShadowNode = null;
+        for (var j = 0; j < xmlChild.children.length; j++) {
+            var grandChildNode = xmlChild.children[j];
+            if (!grandChildNode.name) {
+                // Non-XML tag node.
+                continue;
+            }
+            var grandChildNodeName = grandChildNode.name.toLowerCase();
+            if (grandChildNodeName == 'block') {
+                childBlockNode = grandChildNode;
+            } else if (grandChildNodeName == 'shadow') {
+                childShadowNode = grandChildNode;
+            }
+        }
+
+        // Use shadow block only if there's no real block node.
+        if (!childBlockNode && childShadowNode) {
+            childBlockNode = childShadowNode;
+        }
+
+        // Not all Blockly-type blocks are handled here,
+        // as we won't be using all of them for Scratch.
+        switch (xmlChild.name.toLowerCase()) {
+        case 'field':
+            // Add the field to this block.
+            var fieldName = xmlChild.attribs.name;
+            var fieldData = '';
+            if (xmlChild.children.length > 0 && xmlChild.children[0].data) {
+                fieldData = xmlChild.children[0].data;
+            } else {
+                // If the child of the field with a data property
+                // doesn't exist, set the data to an empty string.
+                fieldData = '';
+            }
+            block.fields[fieldName] = {
+                name: fieldName,
+                value: fieldData
+            };
+            break;
+        case 'value':
+        case 'statement':
+            // Recursively generate block structure for input block.
+            domToBlock(childBlockNode, blocks, false, block.id);
+            if (childShadowNode && childBlockNode != childShadowNode) {
+                // Also generate the shadow block.
+                domToBlock(childShadowNode, blocks, false, block.id);
+            }
+            // Link this block's input to the child block.
+            var inputName = xmlChild.attribs.name;
+            block.inputs[inputName] = {
+                name: inputName,
+                block: childBlockNode.attribs.id,
+                shadow: childShadowNode ? childShadowNode.attribs.id : null
+            };
+            break;
+        case 'next':
+            if (!childBlockNode || !childBlockNode.attribs) {
+                // Invalid child block.
+                continue;
+            }
+            // Recursively generate block structure for next block.
+            domToBlock(childBlockNode, blocks, false, block.id);
+            // Link next block to this block.
+            block.next = childBlockNode.attribs.id;
+            break;
+        case 'mutation':
+            block.mutation = mutationAdapter(xmlChild);
+            break;
+        }
+    }
 }
diff --git a/src/engine/blocks.js b/src/engine/blocks.js
new file mode 100644
index 000000000..0e89025e9
--- /dev/null
+++ b/src/engine/blocks.js
@@ -0,0 +1,494 @@
+var adapter = require('./adapter');
+var mutationAdapter = require('./mutation-adapter');
+var xmlEscape = require('../util/xml-escape');
+
+/**
+ * @fileoverview
+ * Store and mutate the VM block representation,
+ * and handle updates from Scratch Blocks events.
+ */
+
+function Blocks () {
+    /**
+     * All blocks in the workspace.
+     * Keys are block IDs, values are metadata about the block.
+     * @type {Object.<string, Object>}
+     */
+    this._blocks = {};
+
+    /**
+     * All top-level scripts in the workspace.
+     * A list of block IDs that represent scripts (i.e., first block in script).
+     * @type {Array.<String>}
+     */
+    this._scripts = [];
+}
+
+/**
+ * Blockly inputs that represent statements/branch.
+ * are prefixed with this string.
+ * @const{string}
+ */
+Blocks.BRANCH_INPUT_PREFIX = 'SUBSTACK';
+
+/**
+ * Provide an object with metadata for the requested block ID.
+ * @param {!string} blockId ID of block we have stored.
+ * @return {?Object} Metadata about the block, if it exists.
+ */
+Blocks.prototype.getBlock = function (blockId) {
+    return this._blocks[blockId];
+};
+
+/**
+ * Get all known top-level blocks that start scripts.
+ * @return {Array.<string>} List of block IDs.
+ */
+Blocks.prototype.getScripts = function () {
+    return this._scripts;
+};
+
+ /**
+  * Get the next block for a particular block
+  * @param {?string} id ID of block to get the next block for
+  * @return {?string} ID of next block in the sequence
+  */
+Blocks.prototype.getNextBlock = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    return this._blocks[id].next;
+};
+
+/**
+ * Get the branch for a particular C-shaped block.
+ * @param {?string} id ID for block to get the branch for.
+ * @param {?number} branchNum Which branch to select (e.g. for if-else).
+ * @return {?string} ID of block in the branch.
+ */
+Blocks.prototype.getBranch = function (id, branchNum) {
+    var block = this._blocks[id];
+    if (typeof block === 'undefined') return null;
+    if (!branchNum) branchNum = 1;
+
+    var inputName = Blocks.BRANCH_INPUT_PREFIX;
+    if (branchNum > 1) {
+        inputName += branchNum;
+    }
+
+    // Empty C-block?
+    if (!(inputName in block.inputs)) return null;
+    return block.inputs[inputName].block;
+};
+
+/**
+ * Get the opcode for a particular block
+ * @param {?string} id ID of block to query
+ * @return {?string} the opcode corresponding to that block
+ */
+Blocks.prototype.getOpcode = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    return this._blocks[id].opcode;
+};
+
+/**
+ * Get all fields and their values for a block.
+ * @param {?string} id ID of block to query.
+ * @return {!Object} All fields and their values.
+ */
+Blocks.prototype.getFields = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    return this._blocks[id].fields;
+};
+
+/**
+ * Get all non-branch inputs for a block.
+ * @param {?string} id ID of block to query.
+ * @return {!Object} All non-branch inputs and their associated blocks.
+ */
+Blocks.prototype.getInputs = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    var inputs = {};
+    for (var input in this._blocks[id].inputs) {
+        // Ignore blocks prefixed with branch prefix.
+        if (input.substring(0, Blocks.BRANCH_INPUT_PREFIX.length)
+            != Blocks.BRANCH_INPUT_PREFIX) {
+            inputs[input] = this._blocks[id].inputs[input];
+        }
+    }
+    return inputs;
+};
+
+/**
+ * Get mutation data for a block.
+ * @param {?string} id ID of block to query.
+ * @return {!Object} Mutation for the block.
+ */
+Blocks.prototype.getMutation = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    return this._blocks[id].mutation;
+};
+
+/**
+ * Get the top-level script for a given block.
+ * @param {?string} id ID of block to query.
+ * @return {?string} ID of top-level script block.
+ */
+Blocks.prototype.getTopLevelScript = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    var block = this._blocks[id];
+    while (block.parent !== null) {
+        block = this._blocks[block.parent];
+    }
+    return block.id;
+};
+
+/**
+ * Get the procedure definition for a given name.
+ * @param {?string} name Name of procedure to query.
+ * @return {?string} ID of procedure definition.
+ */
+Blocks.prototype.getProcedureDefinition = function (name) {
+    for (var id in this._blocks) {
+        var block = this._blocks[id];
+        if ((block.opcode == 'procedures_defnoreturn' ||
+            block.opcode == 'procedures_defreturn') &&
+            block.mutation.proccode == name) {
+            return id;
+        }
+    }
+    return null;
+};
+
+/**
+ * Get the procedure definition for a given name.
+ * @param {?string} name Name of procedure to query.
+ * @return {?string} ID of procedure definition.
+ */
+Blocks.prototype.getProcedureParamNames = function (name) {
+    for (var id in this._blocks) {
+        var block = this._blocks[id];
+        if ((block.opcode == 'procedures_defnoreturn' ||
+            block.opcode == 'procedures_defreturn') &&
+            block.mutation.proccode == name) {
+            return JSON.parse(block.mutation.argumentnames);
+        }
+    }
+    return null;
+};
+
+// ---------------------------------------------------------------------
+
+/**
+ * Create event listener for blocks. Handles validation and serves as a generic
+ * adapter between the blocks and the runtime interface.
+ * @param {Object} e Blockly "block" event
+ * @param {?Runtime} opt_runtime Optional runtime to forward click events to.
+ */
+
+Blocks.prototype.blocklyListen = function (e, opt_runtime) {
+    // Validate event
+    if (typeof e !== 'object') return;
+    if (typeof e.blockId !== 'string') return;
+
+    // UI event: clicked scripts toggle in the runtime.
+    if (e.element === 'stackclick') {
+        if (opt_runtime) {
+            opt_runtime.toggleScript(e.blockId);
+        }
+        return;
+    }
+
+    // Block create/update/destroy
+    switch (e.type) {
+    case 'create':
+        var newBlocks = adapter(e);
+        // A create event can create many blocks. Add them all.
+        for (var i = 0; i < newBlocks.length; i++) {
+            this.createBlock(newBlocks[i]);
+        }
+        break;
+    case 'change':
+        this.changeBlock({
+            id: e.blockId,
+            element: e.element,
+            name: e.name,
+            value: e.newValue
+        });
+        break;
+    case 'move':
+        this.moveBlock({
+            id: e.blockId,
+            oldParent: e.oldParentId,
+            oldInput: e.oldInputName,
+            newParent: e.newParentId,
+            newInput: e.newInputName,
+            newCoordinate: e.newCoordinate
+        });
+        break;
+    case 'delete':
+        // Don't accept delete events for missing blocks,
+        // or shadow blocks being obscured.
+        if (!this._blocks.hasOwnProperty(e.blockId) ||
+            this._blocks[e.blockId].shadow) {
+            return;
+        }
+        // Inform any runtime to forget about glows on this script.
+        if (opt_runtime && this._blocks[e.blockId].topLevel) {
+            opt_runtime.quietGlow(e.blockId);
+        }
+        this.deleteBlock({
+            id: e.blockId
+        });
+        break;
+    }
+};
+
+// ---------------------------------------------------------------------
+
+/**
+ * Block management: create blocks and scripts from a `create` event
+ * @param {!Object} block Blockly create event to be processed
+ */
+Blocks.prototype.createBlock = function (block) {
+    // Does the block already exist?
+    // Could happen, e.g., for an unobscured shadow.
+    if (this._blocks.hasOwnProperty(block.id)) {
+        return;
+    }
+    // Create new block.
+    this._blocks[block.id] = block;
+    // Push block id to scripts array.
+    // Blocks are added as a top-level stack if they are marked as a top-block
+    // (if they were top-level XML in the event).
+    if (block.topLevel) {
+        this._addScript(block.id);
+    }
+};
+
+/**
+ * Block management: change block field values
+ * @param {!Object} args Blockly change event to be processed
+ */
+Blocks.prototype.changeBlock = function (args) {
+    // Validate
+    if (args.element !== 'field' && args.element !== 'mutation') return;
+    if (typeof this._blocks[args.id] === 'undefined') return;
+
+    if (args.element == 'field') {
+        // Update block value
+        if (!this._blocks[args.id].fields[args.name]) return;
+        this._blocks[args.id].fields[args.name].value = args.value;
+    } else if (args.element == 'mutation') {
+        this._blocks[args.id].mutation = mutationAdapter(args.value);
+    }
+};
+
+/**
+ * Block management: move blocks from parent to parent
+ * @param {!Object} e Blockly move event to be processed
+ */
+Blocks.prototype.moveBlock = function (e) {
+    if (!this._blocks.hasOwnProperty(e.id)) {
+        return;
+    }
+
+    // Move coordinate changes.
+    if (e.newCoordinate) {
+        this._blocks[e.id].x = e.newCoordinate.x;
+        this._blocks[e.id].y = e.newCoordinate.y;
+    }
+
+    // Remove from any old parent.
+    if (e.oldParent !== undefined) {
+        var oldParent = this._blocks[e.oldParent];
+        if (e.oldInput !== undefined &&
+            oldParent.inputs[e.oldInput].block === e.id) {
+            // This block was connected to the old parent's input.
+            oldParent.inputs[e.oldInput].block = null;
+        } else if (oldParent.next === e.id) {
+            // This block was connected to the old parent's next connection.
+            oldParent.next = null;
+        }
+        this._blocks[e.id].parent = null;
+    }
+
+    // Has the block become a top-level block?
+    if (e.newParent === undefined) {
+        this._addScript(e.id);
+    } else {
+        // Remove script, if one exists.
+        this._deleteScript(e.id);
+        // Otherwise, try to connect it in its new place.
+        if (e.newInput !== undefined) {
+            // Moved to the new parent's input.
+            // Don't obscure the shadow block.
+            var oldShadow = null;
+            if (this._blocks[e.newParent].inputs.hasOwnProperty(e.newInput)) {
+                oldShadow = this._blocks[e.newParent].inputs[e.newInput].shadow;
+            }
+            this._blocks[e.newParent].inputs[e.newInput] = {
+                name: e.newInput,
+                block: e.id,
+                shadow: oldShadow
+            };
+        } else {
+            // Moved to the new parent's next connection.
+            this._blocks[e.newParent].next = e.id;
+        }
+        this._blocks[e.id].parent = e.newParent;
+    }
+};
+
+/**
+ * Block management: delete blocks and their associated scripts.
+ * @param {!Object} e Blockly delete event to be processed.
+ */
+Blocks.prototype.deleteBlock = function (e) {
+    // @todo In runtime, stop threads running on this script.
+
+    // Get block
+    var block = this._blocks[e.id];
+
+    // Delete children
+    if (block.next !== null) {
+        this.deleteBlock({id: block.next});
+    }
+
+    // Delete inputs (including branches)
+    for (var input in block.inputs) {
+        // If it's null, the block in this input moved away.
+        if (block.inputs[input].block !== null) {
+            this.deleteBlock({id: block.inputs[input].block});
+        }
+        // Delete obscured shadow blocks.
+        if (block.inputs[input].shadow !== null &&
+            block.inputs[input].shadow !== block.inputs[input].block) {
+            this.deleteBlock({id: block.inputs[input].shadow});
+        }
+    }
+
+    // Delete any script starting with this block.
+    this._deleteScript(e.id);
+
+    // Delete block itself.
+    delete this._blocks[e.id];
+};
+
+// ---------------------------------------------------------------------
+
+/**
+ * Encode all of `this._blocks` as an XML string usable
+ * by a Blockly/scratch-blocks workspace.
+ * @return {string} String of XML representing this object's blocks.
+ */
+Blocks.prototype.toXML = function () {
+    var xmlString = '<xml xmlns="http://www.w3.org/1999/xhtml">';
+    for (var i = 0; i < this._scripts.length; i++) {
+        xmlString += this.blockToXML(this._scripts[i]);
+    }
+    return xmlString + '</xml>';
+};
+
+/**
+ * Recursively encode an individual block and its children
+ * into a Blockly/scratch-blocks XML string.
+ * @param {!string} blockId ID of block to encode.
+ * @return {string} String of XML representing this block and any children.
+ */
+Blocks.prototype.blockToXML = function (blockId) {
+    var block = this._blocks[blockId];
+    // Encode properties of this block.
+    var tagName = (block.shadow) ? 'shadow' : 'block';
+    var xy = (block.topLevel) ?
+        ' x="' + block.x +'"' + ' y="' + block.y +'"' :
+        '';
+    var xmlString = '';
+    xmlString += '<' + tagName +
+        ' id="' + block.id + '"' +
+        ' type="' + block.opcode + '"' +
+        xy +
+        '>';
+    // Add any mutation. Must come before inputs.
+    if (block.mutation) {
+        xmlString += this.mutationToXML(block.mutation);
+    }
+    // Add any inputs on this block.
+    for (var input in block.inputs) {
+        var blockInput = block.inputs[input];
+        // Only encode a value tag if the value input is occupied.
+        if (blockInput.block || blockInput.shadow) {
+            xmlString += '<value name="' + blockInput.name + '">';
+            if (blockInput.block) {
+                xmlString += this.blockToXML(blockInput.block);
+            }
+            if (blockInput.shadow && blockInput.shadow != blockInput.block) {
+                // Obscured shadow.
+                xmlString += this.blockToXML(blockInput.shadow);
+            }
+            xmlString += '</value>';
+        }
+    }
+    // Add any fields on this block.
+    for (var field in block.fields) {
+        var blockField = block.fields[field];
+        var value = blockField.value;
+        if (typeof value === 'string') {
+            value = xmlEscape(blockField.value);
+        }
+        xmlString += '<field name="' + blockField.name + '">' +
+            value + '</field>';
+    }
+    // Add blocks connected to the next connection.
+    if (block.next) {
+        xmlString += '<next>' + this.blockToXML(block.next) + '</next>';
+    }
+    xmlString += '</' + tagName + '>';
+    return xmlString;
+};
+
+/**
+ * Recursively encode a mutation object to XML.
+ * @param {!Object} mutation Object representing a mutation.
+ * @return {string} XML string representing a mutation.
+ */
+Blocks.prototype.mutationToXML = function (mutation) {
+    var mutationString = '<' + mutation.tagName;
+    for (var prop in mutation) {
+        if (prop == 'children' || prop == 'tagName') continue;
+        var mutationValue = (typeof mutation[prop] === 'string') ?
+            xmlEscape(mutation[prop]) : mutation[prop];
+        mutationString += ' ' + prop + '="' + mutationValue + '"';
+    }
+    mutationString += '>';
+    for (var i = 0; i < mutation.children.length; i++) {
+        mutationString += this.mutationToXML(mutation.children[i]);
+    }
+    mutationString += '</' + mutation.tagName + '>';
+    return mutationString;
+};
+
+// ---------------------------------------------------------------------
+
+/**
+ * Helper to add a stack to `this._scripts`.
+ * @param {?string} topBlockId ID of block that starts the script.
+ */
+Blocks.prototype._addScript = function (topBlockId) {
+    var i = this._scripts.indexOf(topBlockId);
+    if (i > -1) return; // Already in scripts.
+    this._scripts.push(topBlockId);
+    // Update `topLevel` property on the top block.
+    this._blocks[topBlockId].topLevel = true;
+};
+
+/**
+ * Helper to remove a script from `this._scripts`.
+ * @param {?string} topBlockId ID of block that starts the script.
+ */
+Blocks.prototype._deleteScript = function (topBlockId) {
+    var i = this._scripts.indexOf(topBlockId);
+    if (i > -1) this._scripts.splice(i, 1);
+    // Update `topLevel` property on the top block.
+    if (this._blocks[topBlockId]) this._blocks[topBlockId].topLevel = false;
+};
+
+module.exports = Blocks;
diff --git a/src/engine/execute.js b/src/engine/execute.js
new file mode 100644
index 000000000..6ef0599de
--- /dev/null
+++ b/src/engine/execute.js
@@ -0,0 +1,248 @@
+var Thread = require('./thread');
+
+/**
+ * Utility function to determine if a value is a Promise.
+ * @param {*} value Value to check for a Promise.
+ * @return {Boolean} True if the value appears to be a Promise.
+ */
+var isPromise = function (value) {
+    return value && value.then && typeof value.then === 'function';
+};
+
+/**
+ * Execute a block.
+ * @param {!Sequencer} sequencer Which sequencer is executing.
+ * @param {!Thread} thread Thread which to read and execute.
+ */
+var execute = function (sequencer, thread) {
+    var runtime = sequencer.runtime;
+    var target = thread.target;
+
+    // Current block to execute is the one on the top of the stack.
+    var currentBlockId = thread.peekStack();
+    var currentStackFrame = thread.peekStackFrame();
+
+    // Check where the block lives: target blocks or flyout blocks.
+    var targetHasBlock = (
+        typeof target.blocks.getBlock(currentBlockId) !== 'undefined'
+    );
+    var flyoutHasBlock = (
+        typeof runtime.flyoutBlocks.getBlock(currentBlockId) !== 'undefined'
+    );
+
+    // Stop if block or target no longer exists.
+    if (!target || (!targetHasBlock && !flyoutHasBlock)) {
+        // No block found: stop the thread; script no longer exists.
+        sequencer.retireThread(thread);
+        return;
+    }
+
+    // Query info about the block.
+    var blockContainer = null;
+    if (targetHasBlock) {
+        blockContainer = target.blocks;
+    } else {
+        blockContainer = runtime.flyoutBlocks;
+    }
+    var opcode = blockContainer.getOpcode(currentBlockId);
+    var fields = blockContainer.getFields(currentBlockId);
+    var inputs = blockContainer.getInputs(currentBlockId);
+    var blockFunction = runtime.getOpcodeFunction(opcode);
+    var isHat = runtime.getIsHat(opcode);
+
+
+    if (!opcode) {
+        console.warn('Could not get opcode for block: ' + currentBlockId);
+        return;
+    }
+
+    /**
+     * Handle any reported value from the primitive, either directly returned
+     * or after a promise resolves.
+     * @param {*} resolvedValue Value eventually returned from the primitive.
+     */
+    var handleReport = function (resolvedValue) {
+        thread.pushReportedValue(resolvedValue);
+        if (isHat) {
+            // Hat predicate was evaluated.
+            if (runtime.getIsEdgeActivatedHat(opcode)) {
+                // If this is an edge-activated hat, only proceed if
+                // the value is true and used to be false.
+                var oldEdgeValue = runtime.updateEdgeActivatedValue(
+                    currentBlockId,
+                    resolvedValue
+                );
+                var edgeWasActivated = !oldEdgeValue && resolvedValue;
+                if (!edgeWasActivated) {
+                    sequencer.retireThread(thread);
+                }
+            } else {
+                // Not an edge-activated hat: retire the thread
+                // if predicate was false.
+                if (!resolvedValue) {
+                    sequencer.retireThread(thread);
+                }
+            }
+        } else {
+            // In a non-hat, report the value visually if necessary if
+            // at the top of the thread stack.
+            if (typeof resolvedValue !== 'undefined' && thread.atStackTop()) {
+                runtime.visualReport(currentBlockId, resolvedValue);
+            }
+            // Finished any yields.
+            thread.status = Thread.STATUS_RUNNING;
+        }
+    };
+
+    // Hats and single-field shadows are implemented slightly differently
+    // from regular blocks.
+    // For hats: if they have an associated block function,
+    // it's treated as a predicate; if not, execution will proceed as a no-op.
+    // For single-field shadows: If the block has a single field, and no inputs,
+    // immediately return the value of the field.
+    if (!blockFunction) {
+        if (isHat) {
+            // Skip through the block (hat with no predicate).
+            return;
+        } else {
+            if (Object.keys(fields).length == 1 &&
+                Object.keys(inputs).length == 0) {
+                // One field and no inputs - treat as arg.
+                for (var fieldKey in fields) { // One iteration.
+                    handleReport(fields[fieldKey].value);
+                }
+            } else {
+                console.warn('Could not get implementation for opcode: ' +
+                    opcode);
+            }
+            thread.requestScriptGlowInFrame = true;
+            return;
+        }
+    }
+
+    // Generate values for arguments (inputs).
+    var argValues = {};
+
+    // Add all fields on this block to the argValues.
+    for (var fieldName in fields) {
+        argValues[fieldName] = fields[fieldName].value;
+    }
+
+    // Recursively evaluate input blocks.
+    for (var inputName in inputs) {
+        var input = inputs[inputName];
+        var inputBlockId = input.block;
+        // Is there no value for this input waiting in the stack frame?
+        if (typeof currentStackFrame.reported[inputName] === 'undefined'
+            && inputBlockId) {
+            // If there's not, we need to evaluate the block.
+            // Push to the stack to evaluate the reporter block.
+            thread.pushStack(inputBlockId);
+            // Save name of input for `Thread.pushReportedValue`.
+            currentStackFrame.waitingReporter = inputName;
+            // Actually execute the block.
+            execute(sequencer, thread);
+            if (thread.status === Thread.STATUS_PROMISE_WAIT) {
+                return;
+            } else {
+                // Execution returned immediately,
+                // and presumably a value was reported, so pop the stack.
+                currentStackFrame.waitingReporter = null;
+                thread.popStack();
+            }
+        }
+        argValues[inputName] = currentStackFrame.reported[inputName];
+    }
+
+    // Add any mutation to args (e.g., for procedures).
+    var mutation = blockContainer.getMutation(currentBlockId);
+    if (mutation) {
+        argValues.mutation = mutation;
+    }
+
+    // If we've gotten this far, all of the input blocks are evaluated,
+    // and `argValues` is fully populated. So, execute the block primitive.
+    // First, clear `currentStackFrame.reported`, so any subsequent execution
+    // (e.g., on return from a branch) gets fresh inputs.
+    currentStackFrame.reported = {};
+
+    var primitiveReportedValue = null;
+    primitiveReportedValue = blockFunction(argValues, {
+        stackFrame: currentStackFrame.executionContext,
+        target: target,
+        yield: function() {
+            thread.status = Thread.STATUS_YIELD;
+        },
+        startBranch: function (branchNum, isLoop) {
+            sequencer.stepToBranch(thread, branchNum, isLoop);
+        },
+        stopAll: function () {
+            runtime.stopAll();
+        },
+        stopOtherTargetThreads: function() {
+            runtime.stopForTarget(target, thread);
+        },
+        stopThread: function() {
+            sequencer.retireThread(thread);
+        },
+        startProcedure: function (procedureCode) {
+            sequencer.stepToProcedure(thread, procedureCode);
+        },
+        getProcedureParamNames: function (procedureCode) {
+            return blockContainer.getProcedureParamNames(procedureCode);
+        },
+        pushParam: function (paramName, paramValue) {
+            thread.pushParam(paramName, paramValue);
+        },
+        getParam: function (paramName) {
+            return thread.getParam(paramName);
+        },
+        startHats: function(requestedHat, opt_matchFields, opt_target) {
+            return (
+                runtime.startHats(requestedHat, opt_matchFields, opt_target)
+            );
+        },
+        ioQuery: function (device, func, args) {
+            // Find the I/O device and execute the query/function call.
+            if (runtime.ioDevices[device] && runtime.ioDevices[device][func]) {
+                var devObject = runtime.ioDevices[device];
+                return devObject[func].call(devObject, args);
+            }
+        }
+    });
+
+    if (typeof primitiveReportedValue === 'undefined') {
+        // No value reported - potentially a command block.
+        // Edge-activated hats don't request a glow; all commands do.
+        thread.requestScriptGlowInFrame = true;
+    }
+
+    // If it's a promise, wait until promise resolves.
+    if (isPromise(primitiveReportedValue)) {
+        if (thread.status === Thread.STATUS_RUNNING) {
+            // Primitive returned a promise; automatically yield thread.
+            thread.status = Thread.STATUS_PROMISE_WAIT;
+        }
+        // Promise handlers
+        primitiveReportedValue.then(function(resolvedValue) {
+            handleReport(resolvedValue);
+            if (typeof resolvedValue !== 'undefined') {
+                thread.popStack();
+            } else {
+                var popped = thread.popStack();
+                var nextBlockId = thread.target.blocks.getNextBlock(popped);
+                thread.pushStack(nextBlockId);
+            }
+        }, function(rejectionReason) {
+            // Promise rejected: the primitive had some error.
+            // Log it and proceed.
+            console.warn('Primitive rejected promise: ', rejectionReason);
+            thread.status = Thread.STATUS_RUNNING;
+            thread.popStack();
+        });
+    } else if (thread.status === Thread.STATUS_RUNNING) {
+        handleReport(primitiveReportedValue);
+    }
+};
+
+module.exports = execute;
diff --git a/src/engine/list.js b/src/engine/list.js
new file mode 100644
index 000000000..8ef082cde
--- /dev/null
+++ b/src/engine/list.js
@@ -0,0 +1,16 @@
+/**
+ * @fileoverview
+ * Object representing a Scratch list.
+ */
+
+ /**
+  * @param {!string} name Name of the list.
+  * @param {Array} contents Contents of the list, as an array.
+  * @constructor
+  */
+function List (name, contents) {
+    this.name = name;
+    this.contents = contents;
+}
+
+module.exports = List;
diff --git a/src/engine/mutation-adapter.js b/src/engine/mutation-adapter.js
new file mode 100644
index 000000000..12dc123e1
--- /dev/null
+++ b/src/engine/mutation-adapter.js
@@ -0,0 +1,39 @@
+var html = require('htmlparser2');
+
+/**
+ * Adapter between mutator XML or DOM and block representation which can be
+ * used by the Scratch runtime.
+ * @param {(Object|string)} mutation Mutation XML string or DOM.
+ * @return {Object} Object representing the mutation.
+ */
+module.exports = function (mutation) {
+    var mutationParsed;
+    // Check if the mutation is already parsed; if not, parse it.
+    if (typeof mutation === 'object') {
+        mutationParsed = mutation;
+    } else {
+        mutationParsed = html.parseDOM(mutation)[0];
+    }
+    return mutatorTagToObject(mutationParsed);
+};
+
+/**
+ * Convert a part of a mutation DOM to a mutation VM object, recursively.
+ * @param {Object} dom DOM object for mutation tag.
+ * @return {Object} Object representing useful parts of this mutation.
+ */
+function mutatorTagToObject (dom) {
+    var obj = Object.create(null);
+    obj.tagName = dom.name;
+    obj.children = [];
+    for (var prop in dom.attribs) {
+        if (prop == 'xmlns') continue;
+        obj[prop] = dom.attribs[prop];
+    }
+    for (var i = 0; i < dom.children.length; i++) {
+        obj.children.push(
+            mutatorTagToObject(dom.children[i])
+        );
+    }
+    return obj;
+}
diff --git a/src/engine/runtime.js b/src/engine/runtime.js
index 0507b96b5..14df35528 100644
--- a/src/engine/runtime.js
+++ b/src/engine/runtime.js
@@ -1,34 +1,37 @@
 var EventEmitter = require('events');
 var Sequencer = require('./sequencer');
+var Blocks = require('./blocks');
 var Thread = require('./thread');
 var util = require('util');
 
+// Virtual I/O devices.
+var Clock = require('../io/clock');
+var Keyboard = require('../io/keyboard');
+var Mouse = require('../io/mouse');
+
 var defaultBlockPackages = {
-    'scratch3': require('../blocks/scratch3'),
-    'wedo2': require('../blocks/wedo2')
+    'scratch3_control': require('../blocks/scratch3_control'),
+    'scratch3_event': require('../blocks/scratch3_event'),
+    'scratch3_looks': require('../blocks/scratch3_looks'),
+    'scratch3_motion': require('../blocks/scratch3_motion'),
+    'scratch3_operators': require('../blocks/scratch3_operators'),
+    'scratch3_sensing': require('../blocks/scratch3_sensing'),
+    'scratch3_data': require('../blocks/scratch3_data'),
+    'scratch3_procedures': require('../blocks/scratch3_procedures')
 };
 
 /**
- * Manages blocks, stacks, and the sequencer.
+ * Manages targets, scripts, and the sequencer.
  */
 function Runtime () {
     // Bind event emitter
     EventEmitter.call(this);
 
-    // State for the runtime
     /**
-     * All blocks in the workspace.
-     * Keys are block IDs, values are metadata about the block.
-     * @type {Object.<string, Object>}
+     * Target management and storage.
+     * @type {Array.<!Target>}
      */
-    this.blocks = {};
-
-    /**
-     * All stacks in the workspace.
-     * A list of block IDs that represent stacks (first block in stack).
-     * @type {Array.<String>}
-     */
-    this.stacks = [];
+    this.targets = [];
 
     /**
      * A list of threads that are currently running in the VM.
@@ -40,161 +43,188 @@ function Runtime () {
     /** @type {!Sequencer} */
     this.sequencer = new Sequencer(this);
 
+    /**
+     * Storage container for flyout blocks.
+     * These will execute on `_editingTarget.`
+     * @type {!Blocks}
+     */
+    this.flyoutBlocks = new Blocks();
+
+    /**
+     * Currently known editing target for the VM.
+     * @type {?Target}
+     */
+    this._editingTarget = null;
+
     /**
      * Map to look up a block primitive's implementation function by its opcode.
      * This is a two-step lookup: package name first, then primitive name.
      * @type {Object.<string, Function>}
      */
     this._primitives = {};
+
+    /**
+     * Map to look up hat blocks' metadata.
+     * Keys are opcode for hat, values are metadata objects.
+     * @type {Object.<string, Object>}
+     */
+    this._hats = {};
+
+    /**
+     * Currently known values for edge-activated hats.
+     * Keys are block ID for the hat; values are the currently known values.
+     * @type {Object.<string, *>}
+     */
+    this._edgeActivatedHatValues = {};
+
+    /**
+     * A list of script block IDs that were glowing during the previous frame.
+     * @type {!Array.<!string>}
+     */
+    this._scriptGlowsPreviousFrame = [];
+
+    /**
+     * A list of block IDs that were glowing during the previous frame.
+     * @type {!Array.<!string>}
+     */
+    this._blockGlowsPreviousFrame = [];
+
+    /**
+     * Currently known number of clones, used to enforce clone limit.
+     * @type {number}
+     */
+    this._cloneCounter = 0;
+
+    /**
+     * Whether the project is in "turbo mode."
+     * @type {Boolean}
+     */
+    this.turboMode = false;
+
+    /**
+     * Whether the project is in "pause mode."
+     * @type {Boolean}
+     */
+    this.pauseMode = false;
+
+    /**
+     * Whether the project is in "compatibility mode" (30 TPS).
+     * @type {Boolean}
+     */
+    this.compatibilityMode = false;
+
+    /**
+     * Whether the project is in "single stepping mode."
+     * @type {Boolean}
+     */
+    this.singleStepping = false;
+
+    /**
+     * How fast in ms "single stepping mode" should run, in ms.
+     * Can be updated dynamically.
+     * @type {!number}
+     */
+    this.singleStepInterval = 1000 / 10;
+
+    /**
+     * A reference to the current runtime stepping interval, set
+     * by a `setInterval`.
+     * @type {!number}
+     */
+    this._steppingInterval = null;
+
+    /**
+     * Current length of a step.
+     * Changes as mode switches, and used by the sequencer to calculate
+     * WORK_TIME.
+     * @type {!number}
+     */
+    this.currentStepTime = null;
+
+    /**
+     * Whether any primitive has requested a redraw.
+     * Affects whether `Sequencer.stepThreads` will yield
+     * after stepping each thread.
+     * Reset on every frame.
+     * @type {boolean}
+     */
+    this.redrawRequested = false;
+
+    // Register all given block packages.
     this._registerBlockPackages();
+
+    // Register and initialize "IO devices", containers for processing
+    // I/O related data.
+    /** @type {Object.<string, Object>} */
+    this.ioDevices = {
+        'clock': new Clock(),
+        'keyboard': new Keyboard(this),
+        'mouse': new Mouse(this)
+    };
 }
 
-/**
- * Event name for glowing a stack
- * @const {string}
- */
-Runtime.STACK_GLOW_ON = 'STACK_GLOW_ON';
-
-/**
- * Event name for unglowing a stack
- * @const {string}
- */
-Runtime.STACK_GLOW_OFF = 'STACK_GLOW_OFF';
-
-/**
- * Event name for glowing a block
- * @const {string}
- */
-Runtime.BLOCK_GLOW_ON = 'BLOCK_GLOW_ON';
-
-/**
- * Event name for unglowing a block
- * @const {string}
- */
-Runtime.BLOCK_GLOW_OFF = 'BLOCK_GLOW_OFF';
-
 /**
  * Inherit from EventEmitter
  */
 util.inherits(Runtime, EventEmitter);
 
 /**
- * How rapidly we try to step threads, in ms.
+ * Width of the stage, in pixels.
+ * @const {number}
  */
-Runtime.THREAD_STEP_INTERVAL = 1000 / 30;
+Runtime.STAGE_WIDTH = 480;
 
 /**
- * Block management: create blocks and stacks from a `create` event
- * @param {!Object} block Blockly create event to be processed
+ * Height of the stage, in pixels.
+ * @const {number}
  */
-Runtime.prototype.createBlock = function (block, opt_isFlyoutBlock) {
-    // Create new block
-    this.blocks[block.id] = block;
-
-    // Walk each field and add any shadow blocks
-    // @todo Expand this to cover vertical / nested blocks
-    for (var i in block.fields) {
-        var shadows = block.fields[i].blocks;
-        for (var y in shadows) {
-            var shadow = shadows[y];
-            this.blocks[shadow.id] = shadow;
-        }
-    }
-
-    // Push block id to stacks array. New blocks are always a stack even if only
-    // momentary. If the new block is added to an existing stack this stack will
-    // be removed by the `moveBlock` method below.
-    if (!opt_isFlyoutBlock) {
-        this.stacks.push(block.id);
-    }
-};
+Runtime.STAGE_HEIGHT = 360;
 
 /**
- * Block management: change block field values
- * @param {!Object} args Blockly change event to be processed
+ * Event name for glowing a script.
+ * @const {string}
  */
-Runtime.prototype.changeBlock = function (args) {
-    // Validate
-    if (args.element !== 'field') return;
-    if (typeof this.blocks[args.id] === 'undefined') return;
-    if (typeof this.blocks[args.id].fields[args.name] === 'undefined') return;
-
-    // Update block value
-    this.blocks[args.id].fields[args.name].value = args.value;
-};
+Runtime.SCRIPT_GLOW_ON = 'STACK_GLOW_ON';
 
 /**
- * Block management: move blocks from parent to parent
- * @param {!Object} e Blockly move event to be processed
+ * Event name for unglowing a script.
+ * @const {string}
  */
-Runtime.prototype.moveBlock = function (e) {
-    var _this = this;
-
-    // Block was removed from parent
-    if (e.newParent === undefined && e.oldParent !== undefined) {
-        // Add stack
-        _this.stacks.push(e.id);
-
-        // Update old parent
-        if (e.oldField === undefined) {
-            _this.blocks[e.oldParent].next = null;
-        } else {
-            delete _this.blocks[e.oldParent].fields[e.oldField];
-        }
-    } else if (e.newParent !== undefined) {
-        // Block was moved to a new parent
-        // Either happens because it was previously parentless
-        // (e.oldParent === undefined)
-        // or because a block was moved in front of it.
-
-        // Remove stack
-        _this._deleteStack(e.id);
-
-        // Update new parent
-        if (e.newField === undefined) {
-            _this.blocks[e.newParent].next = e.id;
-        } else {
-            _this.blocks[e.newParent].fields[e.newField] = {
-                name: e.newField,
-                value: e.id,
-                blocks: {}
-            };
-        }
-    }
-};
+Runtime.SCRIPT_GLOW_OFF = 'STACK_GLOW_OFF';
 
 /**
- * Block management: delete blocks and their associated stacks
- * @param {!Object} e Blockly delete event to be processed
+ * Event name for glowing a block.
+ * @const {string}
  */
-Runtime.prototype.deleteBlock = function (e) {
-    // @todo Stop threads running on this stack
+Runtime.BLOCK_GLOW_ON = 'BLOCK_GLOW_ON';
 
-    // Get block
-    var block = this.blocks[e.id];
+/**
+ * Event name for unglowing a block.
+ * @const {string}
+ */
+Runtime.BLOCK_GLOW_OFF = 'BLOCK_GLOW_OFF';
 
-    // Delete children
-    if (block.next !== null) {
-        this.deleteBlock({id: block.next});
-    }
+/**
+ * Event name for visual value report.
+ * @const {string}
+ */
+Runtime.VISUAL_REPORT = 'VISUAL_REPORT';
 
-    // Delete substacks and fields
-    for (var field in block.fields) {
-        if (field === 'SUBSTACK') {
-            this.deleteBlock({id: block.fields[field].value});
-        } else {
-            for (var shadow in block.fields[field].blocks) {
-                this.deleteBlock({id: shadow});
-            }
-        }
-    }
+/**
+ * How rapidly we try to step threads by default, in ms.
+ */
+Runtime.THREAD_STEP_INTERVAL = 1000 / 60;
 
-    // Delete stack
-    this._deleteStack(e.id);
+/**
+ * In compatibility mode, how rapidly we try to step threads, in ms.
+ */
+Runtime.THREAD_STEP_INTERVAL_COMPATIBILITY = 1000 / 30;
 
-    // Delete block
-    delete this.blocks[e.id];
-};
+/**
+ * How many clones can be created at a time.
+ * @const {number}
+ */
+Runtime.MAX_CLONES = 300;
 
 // -----------------------------------------------------------------------------
 // -----------------------------------------------------------------------------
@@ -209,11 +239,23 @@ Runtime.prototype._registerBlockPackages = function () {
         if (defaultBlockPackages.hasOwnProperty(packageName)) {
             // @todo pass a different runtime depending on package privilege?
             var packageObject = new (defaultBlockPackages[packageName])(this);
-            var packageContents = packageObject.getPrimitives();
-            for (var op in packageContents) {
-                if (packageContents.hasOwnProperty(op)) {
-                    this._primitives[op] =
-                        packageContents[op].bind(packageObject);
+            // Collect primitives from package.
+            if (packageObject.getPrimitives) {
+                var packagePrimitives = packageObject.getPrimitives();
+                for (var op in packagePrimitives) {
+                    if (packagePrimitives.hasOwnProperty(op)) {
+                        this._primitives[op] =
+                            packagePrimitives[op].bind(packageObject);
+                    }
+                }
+            }
+            // Collect hat metadata from package.
+            if (packageObject.getHats) {
+                var packageHats = packageObject.getHats();
+                for (var hatName in packageHats) {
+                    if (packageHats.hasOwnProperty(hatName)) {
+                        this._hats[hatName] = packageHats[hatName];
+                    }
                 }
             }
         }
@@ -229,17 +271,67 @@ Runtime.prototype.getOpcodeFunction = function (opcode) {
     return this._primitives[opcode];
 };
 
+/**
+ * Return whether an opcode represents a hat block.
+ * @param {!string} opcode The opcode to look up.
+ * @return {Boolean} True if the op is known to be a hat.
+ */
+Runtime.prototype.getIsHat = function (opcode) {
+    return this._hats.hasOwnProperty(opcode);
+};
+
+/**
+ * Return whether an opcode represents an edge-activated hat block.
+ * @param {!string} opcode The opcode to look up.
+ * @return {Boolean} True if the op is known to be a edge-activated hat.
+ */
+Runtime.prototype.getIsEdgeActivatedHat = function (opcode) {
+    return this._hats.hasOwnProperty(opcode) &&
+        this._hats[opcode].edgeActivated;
+};
+
+/**
+ * Update an edge-activated hat block value.
+ * @param {!string} blockId ID of hat to store value for.
+ * @param {*} newValue Value to store for edge-activated hat.
+ * @return {*} The old value for the edge-activated hat.
+ */
+Runtime.prototype.updateEdgeActivatedValue = function (blockId, newValue) {
+    var oldValue = this._edgeActivatedHatValues[blockId];
+    this._edgeActivatedHatValues[blockId] = newValue;
+    return oldValue;
+};
+
+/**
+ * Clear all edge-activaed hat values.
+ */
+Runtime.prototype.clearEdgeActivatedValues = function () {
+    this._edgeActivatedHatValues = {};
+};
+
+/**
+ * Attach the renderer
+ * @param {!RenderWebGL} renderer The renderer to attach
+ */
+Runtime.prototype.attachRenderer = function (renderer) {
+    this.renderer = renderer;
+};
+
 // -----------------------------------------------------------------------------
 // -----------------------------------------------------------------------------
 
 /**
  * Create a thread and push it to the list of threads.
- * @param {!string} id ID of block that starts the stack
+ * @param {!string} id ID of block that starts the stack.
+ * @param {!Target} target Target to run thread on.
+ * @return {!Thread} The newly created thread.
  */
-Runtime.prototype._pushThread = function (id) {
-    this.emit(Runtime.STACK_GLOW_ON, id);
+Runtime.prototype._pushThread = function (id, target) {
     var thread = new Thread(id);
+    thread.target = target;
+    thread.pushStack(id);
     this.threads.push(thread);
+    return thread;
 };
 
 /**
@@ -247,79 +339,201 @@ Runtime.prototype._pushThread = function (id) {
  * @param {?Thread} thread Thread object to remove from actives
  */
 Runtime.prototype._removeThread = function (thread) {
+    // Inform sequencer to stop executing that thread.
+    this.sequencer.retireThread(thread);
+    // Remove from the list.
     var i = this.threads.indexOf(thread);
     if (i > -1) {
-        this.emit(Runtime.STACK_GLOW_OFF, thread.topBlock);
         this.threads.splice(i, 1);
     }
 };
 
 /**
- * Toggle a stack
- * @param {!string} stackId ID of block that starts the stack
+ * Return whether a thread is currently active/running.
+ * @param {?Thread} thread Thread object to check.
+ * @return {Boolean} True if the thread is active/running.
  */
-Runtime.prototype.toggleStack = function (stackId) {
-    // Remove any existing thread
+Runtime.prototype.isActiveThread = function (thread) {
+    return this.threads.indexOf(thread) > -1;
+};
+
+/**
+ * Toggle a script.
+ * @param {!string} topBlockId ID of block that starts the script.
+ */
+Runtime.prototype.toggleScript = function (topBlockId) {
+    // Remove any existing thread.
     for (var i = 0; i < this.threads.length; i++) {
-        if (this.threads[i].topBlock == stackId) {
+        if (this.threads[i].topBlock == topBlockId) {
             this._removeThread(this.threads[i]);
             return;
         }
     }
-    // Otherwise add it
-    this._pushThread(stackId);
+    // Otherwise add it.
+    this._pushThread(topBlockId, this._editingTarget);
 };
 
 /**
- * Green flag, which stops currently running threads
- * and adds all top-level stacks that start with the green flag
+ * Run a function `f` for all scripts in a workspace.
+ * `f` will be called with two parameters:
+ *  - the top block ID of the script.
+ *  - the target that owns the script.
+ * @param {!Function} f Function to call for each script.
+ * @param {Target=} opt_target Optionally, a target to restrict to.
  */
-Runtime.prototype.greenFlag = function () {
-    // Remove all existing threads
-    for (var i = 0; i < this.threads.length; i++) {
-        this._removeThread(this.threads[i]);
+Runtime.prototype.allScriptsDo = function (f, opt_target) {
+    var targets = this.targets;
+    if (opt_target) {
+        targets = [opt_target];
     }
-    // Add all top stacks with green flag
-    for (var j = 0; j < this.stacks.length; j++) {
-        var topBlock = this.stacks[j];
-        if (this.blocks[topBlock].opcode === 'event_whenflagclicked') {
-            this._pushThread(this.stacks[j]);
+    for (var t = 0; t < targets.length; t++) {
+        var target = targets[t];
+        var scripts = target.blocks.getScripts();
+        for (var j = 0; j < scripts.length; j++) {
+            var topBlockId = scripts[j];
+            f(topBlockId, target);
         }
     }
 };
 
 /**
- * Distance sensor hack
+ * Start all relevant hats.
+ * @param {!string} requestedHatOpcode Opcode of hats to start.
+ * @param {Object=} opt_matchFields Optionally, fields to match on the hat.
+ * @param {Target=} opt_target Optionally, a target to restrict to.
+ * @return {Array.<Thread>} List of threads started by this function.
  */
-Runtime.prototype.startDistanceSensors = function () {
-    // Add all top stacks with distance sensor
-    for (var j = 0; j < this.stacks.length; j++) {
-        var topBlock = this.stacks[j];
-        if (this.blocks[topBlock].opcode === 'wedo_whendistanceclose') {
-            var alreadyRunning = false;
-            for (var k = 0; k < this.threads.length; k++) {
-                if (this.threads[k].topBlock === topBlock) {
-                    alreadyRunning = true;
+Runtime.prototype.startHats = function (requestedHatOpcode,
+    opt_matchFields, opt_target) {
+    if (!this._hats.hasOwnProperty(requestedHatOpcode)) {
+        // No known hat with this opcode.
+        return;
+    }
+    var instance = this;
+    var newThreads = [];
+    // Consider all scripts, looking for hats with opcode `requestedHatOpcode`.
+    this.allScriptsDo(function(topBlockId, target) {
+        var potentialHatOpcode = target.blocks.getBlock(topBlockId).opcode;
+        if (potentialHatOpcode !== requestedHatOpcode) {
+            // Not the right hat.
+            return;
+        }
+        // Match any requested fields.
+        // For example: ensures that broadcasts match.
+        // This needs to happen before the block is evaluated
+        // (i.e., before the predicate can be run) because "broadcast and wait"
+        // needs to have a precise collection of started threads.
+        var hatFields = target.blocks.getFields(topBlockId);
+        if (opt_matchFields) {
+            for (var matchField in opt_matchFields) {
+                if (hatFields[matchField].value !==
+                    opt_matchFields[matchField]) {
+                    // Field mismatch.
+                    return;
                 }
             }
-            if (!alreadyRunning) {
-                this._pushThread(this.stacks[j]);
+        }
+        // Look up metadata for the relevant hat.
+        var hatMeta = instance._hats[requestedHatOpcode];
+        if (hatMeta.restartExistingThreads) {
+            // If `restartExistingThreads` is true, we should stop
+            // any existing threads starting with the top block.
+            for (var i = 0; i < instance.threads.length; i++) {
+                if (instance.threads[i].topBlock === topBlockId &&
+                    instance.threads[i].target == target) {
+                    instance._removeThread(instance.threads[i]);
+                }
             }
+        } else {
+            // If `restartExistingThreads` is false, we should
+            // give up if any threads with the top block are running.
+            for (var j = 0; j < instance.threads.length; j++) {
+                if (instance.threads[j].topBlock === topBlockId &&
+                    instance.threads[j].target == target) {
+                    // Some thread is already running.
+                    return;
+                }
+            }
+        }
+        // Start the thread with this top block.
+        newThreads.push(instance._pushThread(topBlockId, target));
+    }, opt_target);
+    return newThreads;
+};
+
+/**
+ * Dispose all targets. Return to clean state.
+ */
+Runtime.prototype.dispose = function () {
+    this.stopAll();
+    this.targets.map(this.disposeTarget, this);
+};
+
+/**
+ * Dispose of a target.
+ * @param {!Target} disposingTarget Target to dispose of.
+ */
+Runtime.prototype.disposeTarget = function (disposingTarget) {
+    this.targets = this.targets.filter(function (target) {
+        if (disposingTarget !== target) return true;
+        // Allow target to do dispose actions.
+        target.dispose();
+        // Remove from list of targets.
+        return false;
+    });
+};
+
+/**
+ * Stop any threads acting on the target.
+ * @param {!Target} target Target to stop threads for.
+ * @param {Thread=} opt_threadException Optional thread to skip.
+ */
+Runtime.prototype.stopForTarget = function (target, opt_threadException) {
+    // Stop any threads on the target.
+    for (var i = 0; i < this.threads.length; i++) {
+        if (this.threads[i] === opt_threadException) {
+            continue;
+        }
+        if (this.threads[i].target == target) {
+            this._removeThread(this.threads[i]);
         }
     }
 };
 
 /**
- * Stop "everything"
+ * Start all threads that start with the green flag.
+ */
+Runtime.prototype.greenFlag = function () {
+    this.stopAll();
+    this.ioDevices.clock.resetProjectTimer();
+    this.clearEdgeActivatedValues();
+    // Inform all targets of the green flag.
+    for (var i = 0; i < this.targets.length; i++) {
+        this.targets[i].onGreenFlag();
+    }
+    this.startHats('event_whenflagclicked');
+};
+
+/**
+ * Stop "everything."
  */
 Runtime.prototype.stopAll = function () {
+    // Dispose all clones.
+    var newTargets = [];
+    for (var i = 0; i < this.targets.length; i++) {
+        if (this.targets[i].hasOwnProperty('isOriginal') &&
+            !this.targets[i].isOriginal) {
+            this.targets[i].dispose();
+        } else {
+            newTargets.push(this.targets[i]);
+        }
+    }
+    this.targets = newTargets;
+    // Dispose all threads.
     var threadsCopy = this.threads.slice();
     while (threadsCopy.length > 0) {
-        this._removeThread(threadsCopy.pop());
-    }
-    // @todo call stop function in all extensions/packages/WeDo stub
-    if (window.native) {
-        window.native.motorStop();
+        var poppedThread = threadsCopy.pop();
+        this._removeThread(poppedThread);
     }
 };
 
@@ -328,9 +542,182 @@ Runtime.prototype.stopAll = function () {
  * inactive threads after each iteration.
  */
 Runtime.prototype._step = function () {
-    var inactiveThreads = this.sequencer.stepThreads(this.threads);
-    for (var i = 0; i < inactiveThreads.length; i++) {
-        this._removeThread(inactiveThreads[i]);
+    if (this.pauseMode) {
+        // Don't do any execution while in pause mode.
+        return;
+    }
+    // Find all edge-activated hats, and add them to threads to be evaluated.
+    for (var hatType in this._hats) {
+        var hat = this._hats[hatType];
+        if (hat.edgeActivated) {
+            this.startHats(hatType);
+        }
+    }
+    this.redrawRequested = false;
+    var inactiveThreads = this.sequencer.stepThreads();
+    this._updateGlows(inactiveThreads);
+};
+
+/**
+ * Set the current editing target known by the runtime.
+ * @param {!Target} editingTarget New editing target.
+ */
+Runtime.prototype.setEditingTarget = function (editingTarget) {
+    this._editingTarget = editingTarget;
+    // Script glows must be cleared.
+    this._scriptGlowsPreviousFrame = [];
+    this._updateGlows();
+};
+
+/**
+ * Set whether we are in pause mode.
+ * @param {boolean} pauseModeOn True iff in pause mode.
+ */
+Runtime.prototype.setPauseMode = function (pauseModeOn) {
+    // Inform the project clock/timer to pause/resume its time.
+    if (this.ioDevices.clock) {
+        if (pauseModeOn && !this.pauseMode) {
+            this.ioDevices.clock.pause();
+        }
+        if (!pauseModeOn && this.pauseMode) {
+            this.ioDevices.clock.resume();
+        }
+    }
+    this.pauseMode = pauseModeOn;
+};
+
+/**
+ * Set whether we are in 30 TPS compatibility mode.
+ * @param {boolean} compatibilityModeOn True iff in compatibility mode.
+ */
+Runtime.prototype.setCompatibilityMode = function (compatibilityModeOn) {
+    this.compatibilityMode = compatibilityModeOn;
+    if (this._steppingInterval) {
+        self.clearInterval(this._steppingInterval);
+        this.start();
+    }
+};
+
+/**
+ * Set whether we are in single-stepping mode.
+ * @param {boolean} singleSteppingOn True iff in single-stepping mode.
+ */
+Runtime.prototype.setSingleSteppingMode = function (singleSteppingOn) {
+    this.singleStepping = singleSteppingOn;
+    if (this._steppingInterval) {
+        self.clearInterval(this._steppingInterval);
+        this.start();
+    }
+};
+
+/**
+ * Set the speed during single-stepping mode.
+ * @param {number} speed Interval length to step threads, in ms.
+ */
+Runtime.prototype.setSingleSteppingSpeed = function (speed) {
+    this.singleStepInterval = 1000 / speed;
+    if (this._steppingInterval) {
+        self.clearInterval(this._steppingInterval);
+        this.start();
+    }
+};
+
+/**
+ * Emit glows/glow clears for blocks and scripts after a single tick.
+ * Looks at `this.threads` and notices which have turned on/off new glows.
+ * @param {Array.<Thread>=} opt_extraThreads Optional list of inactive threads.
+ */
+Runtime.prototype._updateGlows = function (opt_extraThreads) {
+    var searchThreads = [];
+    searchThreads.push.apply(searchThreads, this.threads);
+    if (opt_extraThreads) {
+        searchThreads.push.apply(searchThreads, opt_extraThreads);
+    }
+    // Set of scripts that request a glow this frame.
+    var requestedGlowsThisFrame = [];
+    var requestedBlockGlowsThisFrame = [];
+    // Final set of scripts glowing during this frame.
+    var finalScriptGlows = [];
+    var finalBlockGlows = [];
+    // Find all scripts that should be glowing.
+    for (var i = 0; i < searchThreads.length; i++) {
+        var thread = searchThreads[i];
+        var target = thread.target;
+        if (target == this._editingTarget) {
+            var blockForThread = thread.blockGlowInFrame;
+            if (thread.requestScriptGlowInFrame) {
+                var script = target.blocks.getTopLevelScript(blockForThread);
+                if (!script) {
+                    // Attempt to find in flyout blocks.
+                    script = this.flyoutBlocks.getTopLevelScript(
+                        blockForThread
+                    );
+                }
+                if (script) {
+                    requestedGlowsThisFrame.push(script);
+                }
+            }
+            // Only show block glows in single-stepping mode.
+            if (this.singleStepping && blockForThread) {
+                requestedBlockGlowsThisFrame.push(blockForThread);
+            }
+        }
+    }
+    // Compare to previous frame.
+    for (var j = 0; j < this._scriptGlowsPreviousFrame.length; j++) {
+        var previousFrameGlow = this._scriptGlowsPreviousFrame[j];
+        if (requestedGlowsThisFrame.indexOf(previousFrameGlow) < 0) {
+            // Glow turned off.
+            this.glowScript(previousFrameGlow, false);
+        } else {
+            // Still glowing.
+            finalScriptGlows.push(previousFrameGlow);
+        }
+    }
+    for (var k = 0; k < requestedGlowsThisFrame.length; k++) {
+        var currentFrameGlow = requestedGlowsThisFrame[k];
+        if (this._scriptGlowsPreviousFrame.indexOf(currentFrameGlow) < 0) {
+            // Glow turned on.
+            this.glowScript(currentFrameGlow, true);
+            finalScriptGlows.push(currentFrameGlow);
+        }
+    }
+    for (var m = 0; m < this._blockGlowsPreviousFrame.length; m++) {
+        var previousBlockGlow = this._blockGlowsPreviousFrame[m];
+        if (requestedBlockGlowsThisFrame.indexOf(previousBlockGlow) < 0) {
+            // Glow turned off.
+            try {
+                this.glowBlock(previousBlockGlow, false);
+            } catch (e) {
+                // Block has been removed.
+            }
+        } else {
+            // Still glowing.
+            finalBlockGlows.push(previousBlockGlow);
+        }
+    }
+    for (var p = 0; p < requestedBlockGlowsThisFrame.length; p++) {
+        var currentBlockFrameGlow = requestedBlockGlowsThisFrame[p];
+        if (this._blockGlowsPreviousFrame.indexOf(currentBlockFrameGlow) < 0) {
+            // Glow turned on.
+            this.glowBlock(currentBlockFrameGlow, true);
+            finalBlockGlows.push(currentBlockFrameGlow);
+        }
+    }
+    this._scriptGlowsPreviousFrame = finalScriptGlows;
+    this._blockGlowsPreviousFrame = finalBlockGlows;
+};
+
+/**
+ * "Quiet" a script's glow: stop the VM from generating glow/unglow events
+ * about that script. Use when a script has just been deleted, but we may
+ * still be tracking glow data about it.
+ * @param {!string} scriptBlockId Id of top-level block in script to quiet.
+ */
+Runtime.prototype.quietGlow = function (scriptBlockId) {
+    var index = this._scriptGlowsPreviousFrame.indexOf(scriptBlockId);
+    if (index > -1) {
+        this._scriptGlowsPreviousFrame.splice(index, 1);
     }
 };
 
@@ -348,55 +735,116 @@ Runtime.prototype.glowBlock = function (blockId, isGlowing) {
 };
 
 /**
- * Set up timers to repeatedly step in a browser
+ * Emit feedback for script glowing.
+ * @param {?string} topBlockId ID for the top block to update glow
+ * @param {boolean} isGlowing True to turn on glow; false to turn off.
+ */
+Runtime.prototype.glowScript = function (topBlockId, isGlowing) {
+    if (isGlowing) {
+        this.emit(Runtime.SCRIPT_GLOW_ON, topBlockId);
+    } else {
+        this.emit(Runtime.SCRIPT_GLOW_OFF, topBlockId);
+    }
+};
+
+/**
+ * Emit value for reporter to show in the blocks.
+ * @param {string} blockId ID for the block.
+ * @param {string} value Value to show associated with the block.
+ */
+Runtime.prototype.visualReport = function (blockId, value) {
+    this.emit(Runtime.VISUAL_REPORT, blockId, String(value));
+};
+
+/**
+ * Get a target by its id.
+ * @param {string} targetId Id of target to find.
+ * @return {?Target} The target, if found.
+ */
+Runtime.prototype.getTargetById = function (targetId) {
+    for (var i = 0; i < this.targets.length; i++) {
+        var target = this.targets[i];
+        if (target.id == targetId) {
+            return target;
+        }
+    }
+};
+
+/**
+ * Get the first original (non-clone-block-created) sprite given a name.
+ * @param {string} spriteName Name of sprite to look for.
+ * @return {?Target} Target representing a sprite of the given name.
+ */
+Runtime.prototype.getSpriteTargetByName = function (spriteName) {
+    for (var i = 0; i < this.targets.length; i++) {
+        var target = this.targets[i];
+        if (target.sprite && target.sprite.name == spriteName) {
+            return target;
+        }
+    }
+};
+
+/**
+ * Update the clone counter to track how many clones are created.
+ * @param {number} changeAmount How many clones have been created/destroyed.
+ */
+Runtime.prototype.changeCloneCounter = function (changeAmount) {
+    this._cloneCounter += changeAmount;
+};
+
+/**
+ * Return whether there are clones available.
+ * @return {boolean} True until the number of clones hits Runtime.MAX_CLONES.
+ */
+Runtime.prototype.clonesAvailable = function () {
+    return this._cloneCounter < Runtime.MAX_CLONES;
+};
+
+/**
+ * Get a target representing the Scratch stage, if one exists.
+ * @return {?Target} The target, if found.
+ */
+Runtime.prototype.getTargetForStage = function () {
+    for (var i = 0; i < this.targets.length; i++) {
+        var target = this.targets[i];
+        if (target.isStage) {
+            return target;
+        }
+    }
+};
+
+/**
+ * Tell the runtime to request a redraw.
+ * Use after a clone/sprite has completed some visible operation on the stage.
+ */
+Runtime.prototype.requestRedraw = function () {
+    this.redrawRequested = true;
+};
+
+/**
+ * Handle an animation frame from the main thread.
+ */
+Runtime.prototype.animationFrame = function () {
+    if (this.renderer) {
+        // @todo: Only render when this.redrawRequested or clones rendered.
+        this.renderer.draw();
+    }
+};
+
+/**
+ * Set up timers to repeatedly step in a browser.
  */
 Runtime.prototype.start = function () {
-    if (!window.setInterval) return;
-    window.setInterval(function() {
+    var interval = Runtime.THREAD_STEP_INTERVAL;
+    if (this.singleStepping) {
+        interval = this.singleStepInterval;
+    } else if (this.compatibilityMode) {
+        interval = Runtime.THREAD_STEP_INTERVAL_COMPATIBILITY;
+    }
+    this.currentStepTime = interval;
+    this._steppingInterval = self.setInterval(function() {
         this._step();
-    }.bind(this), Runtime.THREAD_STEP_INTERVAL);
-};
-
-// -----------------------------------------------------------------------------
-// -----------------------------------------------------------------------------
-
-/**
- * Helper to remove a stack from `this.stacks`
- * @param {?string} id ID of block that starts the stack
- */
-Runtime.prototype._deleteStack = function (id) {
-    var i = this.stacks.indexOf(id);
-    if (i > -1) this.stacks.splice(i, 1);
-};
-
-/**
- * Helper to get the next block for a particular block
- * @param {?string} id ID of block to get the next block for
- * @return {?string} ID of next block in the sequence
- */
-Runtime.prototype._getNextBlock = function (id) {
-    if (typeof this.blocks[id] === 'undefined') return null;
-    return this.blocks[id].next;
-};
-
-/**
- * Helper to get the substack for a particular C-shaped block
- * @param {?string} id ID for block to get the substack for
- * @return {?string} ID of block in the substack
- */
-Runtime.prototype._getSubstack = function (id) {
-    if (typeof this.blocks[id] === 'undefined') return null;
-    return this.blocks[id].fields['SUBSTACK'];
-};
-
-/**
- * Helper to get the opcode for a particular block
- * @param {?string} id ID of block to query
- * @return {?string} the opcode corresponding to that block
- */
-Runtime.prototype._getOpcode = function (id) {
-    if (typeof this.blocks[id] === 'undefined') return null;
-    return this.blocks[id].opcode;
+    }.bind(this), interval);
 };
 
 module.exports = Runtime;
diff --git a/src/engine/sequencer.js b/src/engine/sequencer.js
index f495264c8..182b9ee65 100644
--- a/src/engine/sequencer.js
+++ b/src/engine/sequencer.js
@@ -1,6 +1,6 @@
 var Timer = require('../util/timer');
 var Thread = require('./thread');
-var YieldTimers = require('../util/yieldtimers.js');
+var execute = require('./execute.js');
 
 function Sequencer (runtime) {
     /**
@@ -17,225 +17,238 @@ function Sequencer (runtime) {
 }
 
 /**
- * The sequencer does as much work as it can within WORK_TIME milliseconds,
- * then yields. This is essentially a rate-limiter for blocks.
- * In Scratch 2.0, this is set to 75% of the target stage frame-rate (30fps).
- * @const {!number}
+ * Time to run a warp-mode thread, in ms.
+ * @type {number}
  */
-Sequencer.WORK_TIME = 10;
+Sequencer.WARP_TIME = 500;
 
 /**
- * Step through all threads in `this.threads`, running them in order.
- * @return {Array.<Thread>} All threads which have finished in this iteration.
+ * Step through all threads in `this.runtime.threads`, running them in order.
+ * @return {Array.<!Thread>} List of inactive threads after stepping.
  */
-Sequencer.prototype.stepThreads = function (threads) {
-    // Start counting toward WORK_TIME
+Sequencer.prototype.stepThreads = function () {
+    // Work time is 75% of the thread stepping interval.
+    var WORK_TIME = 0.75 * this.runtime.currentStepTime;
+    // Start counting toward WORK_TIME.
     this.timer.start();
-    // List of threads which have been killed by this step.
+    // Count of active threads.
+    var numActiveThreads = Infinity;
+    // Whether `stepThreads` has run through a full single tick.
+    var ranFirstTick = false;
     var inactiveThreads = [];
-    // If all of the threads are yielding, we should yield.
-    var numYieldingThreads = 0;
-    // While there are still threads to run and we are within WORK_TIME,
-    // continue executing threads.
-    while (threads.length > 0 &&
-           threads.length > numYieldingThreads &&
-           this.timer.timeElapsed() < Sequencer.WORK_TIME) {
-        // New threads at the end of the iteration.
-        var newThreads = [];
-        // Attempt to run each thread one time
-        for (var i = 0; i < threads.length; i++) {
-            var activeThread = threads[i];
-            if (activeThread.status === Thread.STATUS_RUNNING) {
+    // Conditions for continuing to stepping threads:
+    // 1. We must have threads in the list, and some must be active.
+    // 2. Time elapsed must be less than WORK_TIME.
+    // 3. Either turbo mode, or no redraw has been requested by a primitive.
+    while (this.runtime.threads.length > 0 &&
+           numActiveThreads > 0 &&
+           this.timer.timeElapsed() < WORK_TIME &&
+           (this.runtime.turboMode || !this.runtime.redrawRequested)) {
+        numActiveThreads = 0;
+        // Inline copy of the threads, updated on each step.
+        var threadsCopy = this.runtime.threads.slice();
+        // Attempt to run each thread one time.
+        for (var i = 0; i < threadsCopy.length; i++) {
+            var activeThread = threadsCopy[i];
+            if (activeThread.stack.length === 0 ||
+                activeThread.status === Thread.STATUS_DONE) {
+                // Finished with this thread.
+                if (inactiveThreads.indexOf(activeThread) < 0) {
+                    inactiveThreads.push(activeThread);
+                }
+                continue;
+            }
+            if (activeThread.status === Thread.STATUS_YIELD_TICK &&
+                !ranFirstTick) {
+                // Clear single-tick yield from the last call of `stepThreads`.
+                activeThread.status = Thread.STATUS_RUNNING;
+            }
+            if (activeThread.status === Thread.STATUS_RUNNING ||
+                activeThread.status === Thread.STATUS_YIELD) {
                 // Normal-mode thread: step.
                 this.stepThread(activeThread);
-            } else if (activeThread.status === Thread.STATUS_YIELD) {
-                // Yield-mode thread: check if the time has passed.
-                YieldTimers.resolve(activeThread.yieldTimerId);
-                numYieldingThreads++;
-            } else if (activeThread.status === Thread.STATUS_DONE) {
-                // Moved to a done state - finish up
-                activeThread.status = Thread.STATUS_RUNNING;
-                // @todo Deal with the return value
+                activeThread.warpTimer = null;
             }
-            // First attempt to pop from the stack
-            if (activeThread.stack.length > 0 &&
-                activeThread.nextBlock === null &&
-                activeThread.status === Thread.STATUS_DONE) {
-                activeThread.nextBlock = activeThread.stack.pop();
-                // Don't pop stack frame - we need the data.
-                // A new one won't be created when we execute.
-                if (activeThread.nextBlock !== null) {
-                    activeThread.status === Thread.STATUS_RUNNING;
+            if (activeThread.status === Thread.STATUS_RUNNING) {
+                // After stepping, status is still running.
+                // If we're in single-stepping mode, mark the thread as
+                // a single-tick yield so it doesn't re-execute
+                // until the next frame.
+                if (this.runtime.singleStepping) {
+                    activeThread.status = Thread.STATUS_YIELD_TICK;
                 }
-            }
-            if (activeThread.nextBlock === null &&
-                activeThread.status === Thread.STATUS_DONE) {
-                // Finished with this thread - tell runtime to clean it up.
-                inactiveThreads.push(activeThread);
-            } else {
-                // Keep this thead in the loop.
-                newThreads.push(activeThread);
+                numActiveThreads++;
             }
         }
-        // Effectively filters out threads that have stopped.
-        threads = newThreads;
+        // We successfully ticked once. Prevents running STATUS_YIELD_TICK
+        // threads on the next tick.
+        ranFirstTick = true;
     }
+    // Filter inactive threads from `this.runtime.threads`.
+    this.runtime.threads = this.runtime.threads.filter(function(thread) {
+        if (inactiveThreads.indexOf(thread) > -1) {
+            return false;
+        }
+        return true;
+    });
     return inactiveThreads;
 };
 
 /**
- * Step the requested thread
- * @param {!Thread} thread Thread object to step
+ * Step the requested thread for as long as necessary.
+ * @param {!Thread} thread Thread object to step.
  */
 Sequencer.prototype.stepThread = function (thread) {
-    // Save the yield timer ID, in case a primitive makes a new one
-    // @todo hack - perhaps patch this to allow more than one timer per
-    // primitive, for example...
-    var oldYieldTimerId = YieldTimers.timerId;
+    var currentBlockId = thread.peekStack();
+    if (!currentBlockId) {
+        // A "null block" - empty branch.
+        thread.popStack();
+    }
+    while (thread.peekStack()) {
+        var isWarpMode = thread.peekStackFrame().warpMode;
+        if (isWarpMode && !thread.warpTimer) {
+            // Initialize warp-mode timer if it hasn't been already.
+            // This will start counting the thread toward `Sequencer.WARP_TIME`.
+            thread.warpTimer = new Timer();
+            thread.warpTimer.start();
+        }
+        // Execute the current block.
+        // Save the current block ID to notice if we did control flow.
+        currentBlockId = thread.peekStack();
+        execute(this, thread);
+        thread.blockGlowInFrame = currentBlockId;
+        // If the thread has yielded or is waiting, yield to other threads.
+        if (thread.status === Thread.STATUS_YIELD) {
+            // Mark as running for next iteration.
+            thread.status = Thread.STATUS_RUNNING;
+            // In warp mode, yielded blocks are re-executed immediately.
+            if (isWarpMode &&
+                thread.warpTimer.timeElapsed() <= Sequencer.WARP_TIME) {
+                continue;
+            }
+            return;
+        } else if (thread.status === Thread.STATUS_PROMISE_WAIT) {
+            // A promise was returned by the primitive. Yield the thread
+            // until the promise resolves. Promise resolution should reset
+            // thread.status to Thread.STATUS_RUNNING.
+            return;
+        }
+        // If no control flow has happened, switch to next block.
+        if (thread.peekStack() === currentBlockId) {
+            thread.goToNextBlock();
+        }
+        // If no next block has been found at this point, look on the stack.
+        while (!thread.peekStack()) {
+            thread.popStack();
+            if (thread.stack.length === 0) {
+                // No more stack to run!
+                thread.status = Thread.STATUS_DONE;
+                return;
+            }
+            if (thread.peekStackFrame().isLoop) {
+                // The current level of the stack is marked as a loop.
+                // Return to yield for the frame/tick in general.
+                // Unless we're in warp mode - then only return if the
+                // warp timer is up.
+                if (!isWarpMode ||
+                    thread.warpTimer.timeElapsed() > Sequencer.WARP_TIME) {
+                    // Don't do anything to the stack, since loops need
+                    // to be re-executed.
+                    return;
+                } else {
+                    // Don't go to the next block for this level of the stack,
+                    // since loops need to be re-executed.
+                    continue;
+                }
+            } else if (thread.peekStackFrame().waitingReporter) {
+                // This level of the stack was waiting for a value.
+                // This means a reporter has just returned - so don't go
+                // to the next block for this level of the stack.
+                return;
+            }
+            // Get next block of existing block on the stack.
+            thread.goToNextBlock();
+        }
+        // In single-stepping mode, force `stepThread` to only run one block
+        // at a time.
+        if (this.runtime.singleStepping) {
+            return;
+        }
+    }
+};
 
-    // Save the current block and set the nextBlock.
-    // If the primitive would like to do control flow,
-    // it can overwrite nextBlock.
-    var currentBlock = thread.nextBlock;
-    if (!currentBlock || !this.runtime.blocks[currentBlock]) {
-        thread.status = Thread.STATUS_DONE;
+/**
+ * Step a thread into a block's branch.
+ * @param {!Thread} thread Thread object to step to branch.
+ * @param {Number} branchNum Which branch to step to (i.e., 1, 2).
+ * @param {Boolean} isLoop Whether this block is a loop.
+ */
+Sequencer.prototype.stepToBranch = function (thread, branchNum, isLoop) {
+    if (!branchNum) {
+        branchNum = 1;
+    }
+    var currentBlockId = thread.peekStack();
+    var branchId = thread.target.blocks.getBranch(
+        currentBlockId,
+        branchNum
+    );
+    thread.peekStackFrame().isLoop = isLoop;
+    if (branchId) {
+        // Push branch ID to the thread's stack.
+        thread.pushStack(branchId);
+    } else {
+        thread.pushStack(null);
+    }
+};
+
+/**
+ * Step a procedure.
+ * @param {!Thread} thread Thread object to step to procedure.
+ * @param {!string} procedureCode Procedure code of procedure to step to.
+ */
+Sequencer.prototype.stepToProcedure = function (thread, procedureCode) {
+    var definition = thread.target.blocks.getProcedureDefinition(procedureCode);
+    if (!definition) {
         return;
     }
-    thread.nextBlock = this.runtime._getNextBlock(currentBlock);
-
-    var opcode = this.runtime._getOpcode(currentBlock);
-
-    // Push the current block to the stack
-    thread.stack.push(currentBlock);
-    // Push an empty stack frame, if we need one.
-    // Might not, if we just popped the stack.
-    if (thread.stack.length > thread.stackFrames.length) {
-        thread.stackFrames.push({});
-    }
-    var currentStackFrame = thread.stackFrames[thread.stackFrames.length - 1];
-
-    /**
-     * A callback for the primitive to indicate its thread should yield.
-     * @type {Function}
-     */
-    var threadYieldCallback = function () {
+    // Check if the call is recursive.
+    // If so, set the thread to yield after pushing.
+    var isRecursive = thread.isRecursiveCall(procedureCode);
+    // To step to a procedure, we put its definition on the stack.
+    // Execution for the thread will proceed through the definition hat
+    // and on to the main definition of the procedure.
+    // When that set of blocks finishes executing, it will be popped
+    // from the stack by the sequencer, returning control to the caller.
+    thread.pushStack(definition);
+    // In known warp-mode threads, only yield when time is up.
+    if (thread.peekStackFrame().warpMode &&
+        thread.warpTimer.timeElapsed() > Sequencer.WARP_TIME) {
         thread.status = Thread.STATUS_YIELD;
-    };
-
-    /**
-     * A callback for the primitive to indicate its thread is finished
-     * @type {Function}
-     */
-    var instance = this;
-    var threadDoneCallback = function () {
-        thread.status = Thread.STATUS_DONE;
-        // Refresh nextBlock in case it has changed during a yield.
-        thread.nextBlock = instance.runtime._getNextBlock(currentBlock);
-        // Pop the stack and stack frame
-        thread.stack.pop();
-        thread.stackFrames.pop();
-    };
-
-    /**
-     * A callback for the primitive to start hats.
-     * @todo very hacked...
-     */
-    var startHats = function(callback) {
-        for (var i = 0; i < instance.runtime.stacks.length; i++) {
-            var stack = instance.runtime.stacks[i];
-            var stackBlock = instance.runtime.blocks[stack];
-            var result = callback(stackBlock);
-            if (result) {
-                // Check if the stack is already running
-                var stackRunning = false;
-
-                for (var j = 0; j < instance.runtime.threads.length; j++) {
-                    if (instance.runtime.threads[j].topBlock == stack) {
-                        stackRunning = true;
-                        break;
-                    }
-                }
-                if (!stackRunning) {
-                    instance.runtime._pushThread(stack);
-                }
-            }
-        }
-    };
-
-    /**
-     * Record whether we have switched stack,
-     * to avoid proceeding the thread automatically.
-     * @type {boolean}
-     */
-    var switchedStack = false;
-    /**
-     * A callback for a primitive to start a substack.
-     * @type {Function}
-     */
-    var threadStartSubstack = function () {
-        // Set nextBlock to the start of the substack
-        var substack = instance.runtime._getSubstack(currentBlock);
-        if (substack && substack.value) {
-            thread.nextBlock = substack.value;
+    } else {
+        // Look for warp-mode flag on definition, and set the thread
+        // to warp-mode if needed.
+        var definitionBlock = thread.target.blocks.getBlock(definition);
+        var doWarp = definitionBlock.mutation.warp;
+        if (doWarp) {
+            thread.peekStackFrame().warpMode = true;
         } else {
-            thread.nextBlock = null;
-        }
-        switchedStack = true;
-    };
-
-    // @todo extreme hack to get the single argument value for prototype
-    var argValues = [];
-    var blockInputs = this.runtime.blocks[currentBlock].fields;
-    for (var bi in blockInputs) {
-        var outer = blockInputs[bi];
-        for (var b in outer.blocks) {
-            var block = outer.blocks[b];
-            var fields = block.fields;
-            for (var f in fields) {
-                var field = fields[f];
-                argValues.push(field.value);
-            }
-        }
-    }
-
-    if (!opcode) {
-        console.warn('Could not get opcode for block: ' + currentBlock);
-    }
-    else {
-        var blockFunction = this.runtime.getOpcodeFunction(opcode);
-        if (!blockFunction) {
-            console.warn('Could not get implementation for opcode: ' + opcode);
-        }
-        else {
-            try {
-                // @todo deal with the return value
-                blockFunction(argValues, {
-                    yield: threadYieldCallback,
-                    done: threadDoneCallback,
-                    timeout: YieldTimers.timeout,
-                    stackFrame: currentStackFrame,
-                    startSubstack: threadStartSubstack,
-                    startHats: startHats
-                });
-            }
-            catch(e) {
-                console.error(
-                    'Exception calling block function for opcode: ' +
-                    opcode + '\n' + e);
-            } finally {
-                // Update if the thread has set a yield timer ID
-                // @todo hack
-                if (YieldTimers.timerId > oldYieldTimerId) {
-                    thread.yieldTimerId = YieldTimers.timerId;
-                }
-                if (thread.status === Thread.STATUS_RUNNING && !switchedStack) {
-                    // Thread executed without yielding - move to done
-                    threadDoneCallback();
-                }
+            // In normal-mode threads, yield any time we have a recursive call.
+            if (isRecursive) {
+                thread.status = Thread.STATUS_YIELD;
             }
         }
     }
+};
 
+/**
+ * Retire a thread in the middle, without considering further blocks.
+ * @param {!Thread} thread Thread object to retire.
+ */
+Sequencer.prototype.retireThread = function (thread) {
+    thread.stack = [];
+    thread.stackFrame = [];
+    thread.requestScriptGlowInFrame = false;
+    thread.status = Thread.STATUS_DONE;
 };
 
 module.exports = Sequencer;
diff --git a/src/engine/target.js b/src/engine/target.js
new file mode 100644
index 000000000..d5a59b47a
--- /dev/null
+++ b/src/engine/target.js
@@ -0,0 +1,116 @@
+var Blocks = require('./blocks');
+var Variable = require('../engine/variable');
+var List = require('../engine/list');
+var uid = require('../util/uid');
+
+/**
+ * @fileoverview
+ * A Target is an abstract "code-running" object for the Scratch VM.
+ * Examples include sprites/clones or potentially physical-world devices.
+ */
+
+/**
+ * @param {?Blocks} blocks Blocks instance for the blocks owned by this target.
+ * @constructor
+ */
+function Target (blocks) {
+    if (!blocks) {
+        blocks = new Blocks(this);
+    }
+    /**
+     * A unique ID for this target.
+     * @type {string}
+     */
+    this.id = uid();
+    /**
+     * Blocks run as code for this target.
+     * @type {!Blocks}
+     */
+    this.blocks = blocks;
+    /**
+     * Dictionary of variables and their values for this target.
+     * Key is the variable name.
+     * @type {Object.<string,*>}
+     */
+    this.variables = {};
+    /**
+     * Dictionary of lists and their contents for this target.
+     * Key is the list name.
+     * @type {Object.<string,*>}
+     */
+    this.lists = {};
+}
+
+/**
+ * Called when the project receives a "green flag."
+ * @abstract
+ */
+Target.prototype.onGreenFlag = function () {};
+
+/**
+ * Return a human-readable name for this target.
+ * Target implementations should override this.
+ * @abstract
+ * @returns {string} Human-readable name for the target.
+ */
+Target.prototype.getName = function () {
+    return this.id;
+};
+
+/**
+ * Look up a variable object, and create it if one doesn't exist.
+ * Search begins for local variables; then look for globals.
+ * @param {!string} name Name of the variable.
+ * @return {!Variable} Variable object.
+ */
+Target.prototype.lookupOrCreateVariable = function (name) {
+    // If we have a local copy, return it.
+    if (this.variables.hasOwnProperty(name)) {
+        return this.variables[name];
+    }
+    // If the stage has a global copy, return it.
+    if (this.runtime && !this.isStage) {
+        var stage = this.runtime.getTargetForStage();
+        if (stage.variables.hasOwnProperty(name)) {
+            return stage.variables[name];
+        }
+    }
+    // No variable with this name exists - create it locally.
+    var newVariable = new Variable(name, 0, false);
+    this.variables[name] = newVariable;
+    return newVariable;
+};
+
+/**
+* Look up a list object for this target, and create it if one doesn't exist.
+* Search begins for local lists; then look for globals.
+* @param {!string} name Name of the list.
+* @return {!List} List object.
+ */
+Target.prototype.lookupOrCreateList = function (name) {
+    // If we have a local copy, return it.
+    if (this.lists.hasOwnProperty(name)) {
+        return this.lists[name];
+    }
+    // If the stage has a global copy, return it.
+    if (this.runtime && !this.isStage) {
+        var stage = this.runtime.getTargetForStage();
+        if (stage.lists.hasOwnProperty(name)) {
+            return stage.lists[name];
+        }
+    }
+    // No list with this name exists - create it locally.
+    var newList = new List(name, []);
+    this.lists[name] = newList;
+    return newList;
+};
+
+/**
+ * Call to destroy a target.
+ * @abstract
+ */
+Target.prototype.dispose = function () {
+
+};
+
+module.exports = Target;
diff --git a/src/engine/thread.js b/src/engine/thread.js
index 07ceaca35..9aeb559f3 100644
--- a/src/engine/thread.js
+++ b/src/engine/thread.js
@@ -9,11 +9,7 @@ function Thread (firstBlock) {
      * @type {!string}
      */
     this.topBlock = firstBlock;
-    /**
-     * ID of next block that the thread will execute, or null if none.
-     * @type {?string}
-     */
-    this.nextBlock = firstBlock;
+
     /**
      * Stack for the thread. When the sequencer enters a control structure,
      * the block is pushed onto the stack so we know where to exit.
@@ -34,32 +30,208 @@ function Thread (firstBlock) {
     this.status = 0; /* Thread.STATUS_RUNNING */
 
     /**
-     * Yield timer ID (for checking when the thread should unyield).
-     * @type {number}
+     * Target of this thread.
+     * @type {?Target}
      */
-    this.yieldTimerId = -1;
+    this.target = null;
+
+    /**
+     * Whether the thread requests its script to glow during this frame.
+     * @type {boolean}
+     */
+    this.requestScriptGlowInFrame = false;
+
+    /**
+     * Which block ID should glow during this frame, if any.
+     * @type {?string}
+     */
+    this.blockGlowInFrame = null;
+
+    /**
+     * A timer for when the thread enters warp mode.
+     * Substitutes the sequencer's count toward WORK_TIME on a per-thread basis.
+     * @type {?Timer}
+     */
+    this.warpTimer = null;
 }
 
 /**
  * Thread status for initialized or running thread.
- * Threads are in this state when the primitive is called for the first time.
+ * This is the default state for a thread - execution should run normally,
+ * stepping from block to block.
  * @const
  */
 Thread.STATUS_RUNNING = 0;
 
 /**
- * Thread status for a yielded thread.
- * Threads are in this state when a primitive has yielded.
+ * Threads are in this state when a primitive is waiting on a promise;
+ * execution is paused until the promise changes thread status.
  * @const
  */
-Thread.STATUS_YIELD = 1;
+Thread.STATUS_PROMISE_WAIT = 1;
+
+/**
+ * Thread status for yield.
+ * @const
+ */
+Thread.STATUS_YIELD = 2;
+
+/**
+ * Thread status for a single-tick yield. This will be cleared when the
+ * thread is resumed.
+ * @const
+ */
+Thread.STATUS_YIELD_TICK = 3;
 
 /**
  * Thread status for a finished/done thread.
- * Thread is moved to this state when the interpreter
- * can proceed with execution.
+ * Thread is in this state when there are no more blocks to execute.
  * @const
  */
-Thread.STATUS_DONE = 2;
+Thread.STATUS_DONE = 4;
+
+/**
+ * Push stack and update stack frames appropriately.
+ * @param {string} blockId Block ID to push to stack.
+ */
+Thread.prototype.pushStack = function (blockId) {
+    this.stack.push(blockId);
+    // Push an empty stack frame, if we need one.
+    // Might not, if we just popped the stack.
+    if (this.stack.length > this.stackFrames.length) {
+        // Copy warp mode from any higher level.
+        var warpMode = false;
+        if (this.stackFrames[this.stackFrames.length - 1]) {
+            warpMode = this.stackFrames[this.stackFrames.length - 1].warpMode;
+        }
+        this.stackFrames.push({
+            isLoop: false, // Whether this level of the stack is a loop.
+            warpMode: warpMode, // Whether this level is in warp mode.
+            reported: {}, // Collects reported input values.
+            waitingReporter: null, // Name of waiting reporter.
+            params: {}, // Procedure parameters.
+            executionContext: {} // A context passed to block implementations.
+        });
+    }
+};
+
+/**
+ * Pop last block on the stack and its stack frame.
+ * @return {string} Block ID popped from the stack.
+ */
+Thread.prototype.popStack = function () {
+    this.stackFrames.pop();
+    return this.stack.pop();
+};
+
+/**
+ * Get top stack item.
+ * @return {?string} Block ID on top of stack.
+ */
+Thread.prototype.peekStack = function () {
+    return this.stack[this.stack.length - 1];
+};
+
+
+/**
+ * Get top stack frame.
+ * @return {?Object} Last stack frame stored on this thread.
+ */
+Thread.prototype.peekStackFrame = function () {
+    return this.stackFrames[this.stackFrames.length - 1];
+};
+
+/**
+ * Get stack frame above the current top.
+ * @return {?Object} Second to last stack frame stored on this thread.
+ */
+Thread.prototype.peekParentStackFrame = function () {
+    return this.stackFrames[this.stackFrames.length - 2];
+};
+
+/**
+ * Push a reported value to the parent of the current stack frame.
+ * @param {*} value Reported value to push.
+ */
+Thread.prototype.pushReportedValue = function (value) {
+    var parentStackFrame = this.peekParentStackFrame();
+    if (parentStackFrame) {
+        var waitingReporter = parentStackFrame.waitingReporter;
+        parentStackFrame.reported[waitingReporter] = value;
+    }
+};
+
+/**
+ * Add a parameter to the stack frame.
+ * Use when calling a procedure with parameter values.
+ * @param {!string} paramName Name of parameter.
+ * @param {*} value Value to set for parameter.
+ */
+Thread.prototype.pushParam = function (paramName, value) {
+    var stackFrame = this.peekStackFrame();
+    stackFrame.params[paramName] = value;
+};
+
+/**
+ * Get a parameter at the lowest possible level of the stack.
+ * @param {!string} paramName Name of parameter.
+ * @return {*} value Value for parameter.
+ */
+Thread.prototype.getParam = function (paramName) {
+    for (var i = this.stackFrames.length - 1; i >= 0; i--) {
+        var frame = this.stackFrames[i];
+        if (frame.params.hasOwnProperty(paramName)) {
+            return frame.params[paramName];
+        }
+    }
+    return null;
+};
+
+/**
+ * Whether the current execution of a thread is at the top of the stack.
+ * @return {Boolean} True if execution is at top of the stack.
+ */
+Thread.prototype.atStackTop = function () {
+    return this.peekStack() === this.topBlock;
+};
+
+
+/**
+ * Switch the thread to the next block at the current level of the stack.
+ * For example, this is used in a standard sequence of blocks,
+ * where execution proceeds from one block to the next.
+ */
+Thread.prototype.goToNextBlock = function () {
+    var nextBlockId = this.target.blocks.getNextBlock(this.peekStack());
+    // Copy warp mode to next block.
+    var warpMode = this.peekStackFrame().warpMode;
+    // The current block is on the stack - pop it and push the next.
+    // Note that this could push `null` - that is handled by the sequencer.
+    this.popStack();
+    this.pushStack(nextBlockId);
+    if (this.peekStackFrame()) {
+        this.peekStackFrame().warpMode = warpMode;
+    }
+};
+
+/**
+ * Attempt to determine whether a procedure call is recursive,
+ * by examining the stack.
+ * @param {!string} procedureCode Procedure code of procedure being called.
+ * @return {boolean} True if the call appears recursive.
+ */
+Thread.prototype.isRecursiveCall = function (procedureCode) {
+    var callCount = 5; // Max number of enclosing procedure calls to examine.
+    var sp = this.stack.length - 1;
+    for (var i = sp - 1; i >= 0; i--) {
+        var block = this.target.blocks.getBlock(this.stack[i]);
+        if (block.opcode == 'procedures_callnoreturn' &&
+            block.mutation.proccode == procedureCode)  {
+            return true;
+        }
+        if (--callCount < 0) return false;
+    }
+    return false;
+};
 
 module.exports = Thread;
diff --git a/src/engine/variable.js b/src/engine/variable.js
new file mode 100644
index 000000000..4e5e5e6e3
--- /dev/null
+++ b/src/engine/variable.js
@@ -0,0 +1,18 @@
+/**
+ * @fileoverview
+ * Object representing a Scratch variable.
+ */
+
+/**
+ * @param {!string} name Name of the variable.
+ * @param {(string|Number)} value Value of the variable.
+ * @param {boolean} isCloud Whether the variable is stored in the cloud.
+ * @constructor
+ */
+function Variable (name, value, isCloud) {
+    this.name = name;
+    this.value = value;
+    this.isCloud = isCloud;
+}
+
+module.exports = Variable;
diff --git a/src/import/sb2import.js b/src/import/sb2import.js
new file mode 100644
index 000000000..b97144d20
--- /dev/null
+++ b/src/import/sb2import.js
@@ -0,0 +1,418 @@
+/**
+ * @fileoverview
+ * Partial implementation of an SB2 JSON importer.
+ * Parses provided JSON and then generates all needed
+ * scratch-vm runtime structures.
+ */
+
+var Blocks = require('../engine/blocks');
+var Clone = require('../sprites/clone');
+var Sprite = require('../sprites/sprite');
+var Color = require('../util/color.js');
+var uid = require('../util/uid');
+var specMap = require('./sb2specmap');
+var Variable = require('../engine/variable');
+var List = require('../engine/list');
+
+/**
+ * Top-level handler. Parse provided JSON,
+ * and process the top-level object (the stage object).
+ * @param {!string} json SB2-format JSON to load.
+ * @param {!Runtime} runtime Runtime object to load all structures into.
+ */
+function sb2import (json, runtime) {
+    parseScratchObject(
+        JSON.parse(json),
+        runtime,
+        true
+    );
+}
+
+/**
+ * Parse a single "Scratch object" and create all its in-memory VM objects.
+ * @param {!Object} object From-JSON "Scratch object:" sprite, stage, watcher.
+ * @param {!Runtime} runtime Runtime object to load all structures into.
+ * @param {boolean} topLevel Whether this is the top-level object (stage).
+ */
+function parseScratchObject (object, runtime, topLevel) {
+    if (!object.hasOwnProperty('objName')) {
+        // Watcher/monitor - skip this object until those are implemented in VM.
+        // @todo
+        return;
+    }
+    // Blocks container for this object.
+    var blocks = new Blocks();
+    // @todo: For now, load all Scratch objects (stage/sprites) as a Sprite.
+    var sprite = new Sprite(blocks, runtime);
+    // Sprite/stage name from JSON.
+    if (object.hasOwnProperty('objName')) {
+        sprite.name = object.objName;
+    }
+    // Costumes from JSON.
+    if (object.hasOwnProperty('costumes')) {
+        for (var i = 0; i < object.costumes.length; i++) {
+            var costume = object.costumes[i];
+            // @todo: Make sure all the relevant metadata is being pulled out.
+            sprite.costumes.push({
+                skin: 'https://cdn.assets.scratch.mit.edu/internalapi/asset/'
+                    + costume.baseLayerMD5 + '/get/',
+                name: costume.costumeName,
+                bitmapResolution: costume.bitmapResolution,
+                rotationCenterX: costume.rotationCenterX,
+                rotationCenterY: costume.rotationCenterY
+            });
+        }
+    }
+    // If included, parse any and all scripts/blocks on the object.
+    if (object.hasOwnProperty('scripts')) {
+        parseScripts(object.scripts, blocks);
+    }
+    // Create the first clone, and load its run-state from JSON.
+    var target = sprite.createClone();
+    // Add it to the runtime's list of targets.
+    runtime.targets.push(target);
+    // Load target properties from JSON.
+    if (object.hasOwnProperty('variables')) {
+        for (var j = 0; j < object.variables.length; j++) {
+            var variable = object.variables[j];
+            target.variables[variable.name] = new Variable(
+                variable.name,
+                variable.value,
+                variable.isPersistent
+            );
+        }
+    }
+    if (object.hasOwnProperty('lists')) {
+        for (var k = 0; k < object.lists.length; k++) {
+            var list = object.lists[k];
+            // @todo: monitor properties.
+            target.lists[list.listName] = new List(
+                list.listName,
+                list.contents
+            );
+        }
+    }
+    if (object.hasOwnProperty('scratchX')) {
+        target.x = object.scratchX;
+    }
+    if (object.hasOwnProperty('scratchY')) {
+        target.y = object.scratchY;
+    }
+    if (object.hasOwnProperty('direction')) {
+        target.direction = object.direction;
+    }
+    if (object.hasOwnProperty('scale')) {
+        // SB2 stores as 1.0 = 100%; we use % in the VM.
+        target.size = object.scale * 100;
+    }
+    if (object.hasOwnProperty('visible')) {
+        target.visible = object.visible;
+    }
+    if (object.hasOwnProperty('currentCostumeIndex')) {
+        target.currentCostume = Math.round(object.currentCostumeIndex);
+    }
+    if (object.hasOwnProperty('rotationStyle')) {
+        if (object.rotationStyle == 'none') {
+            target.rotationStyle = Clone.ROTATION_STYLE_NONE;
+        } else if (object.rotationStyle == 'leftRight') {
+            target.rotationStyle = Clone.ROTATION_STYLE_LEFT_RIGHT;
+        } else if (object.rotationStyle == 'normal') {
+            target.rotationStyle = Clone.ROTATION_STYLE_ALL_AROUND;
+        }
+    }
+    target.isStage = topLevel;
+    target.updateAllDrawableProperties();
+    // The stage will have child objects; recursively process them.
+    if (object.children) {
+        for (var m = 0; m < object.children.length; m++) {
+            parseScratchObject(object.children[m], runtime, false);
+        }
+    }
+}
+
+/**
+ * Parse a Scratch object's scripts into VM blocks.
+ * This should only handle top-level scripts that include X, Y coordinates.
+ * @param {!Object} scripts Scripts object from SB2 JSON.
+ * @param {!Blocks} blocks Blocks object to load parsed blocks into.
+ */
+function parseScripts (scripts, blocks) {
+    for (var i = 0; i < scripts.length; i++) {
+        var script = scripts[i];
+        var scriptX = script[0];
+        var scriptY = script[1];
+        var blockList = script[2];
+        var parsedBlockList = parseBlockList(blockList);
+        if (parsedBlockList[0]) {
+            // Adjust script coordinates to account for
+            // larger block size in scratch-blocks.
+            // @todo: Determine more precisely the right formulas here.
+            parsedBlockList[0].x = scriptX * 1.1;
+            parsedBlockList[0].y = scriptY * 1.1;
+            parsedBlockList[0].topLevel = true;
+            parsedBlockList[0].parent = null;
+        }
+        // Flatten children and create add the blocks.
+        var convertedBlocks = flatten(parsedBlockList);
+        for (var j = 0; j < convertedBlocks.length; j++) {
+            blocks.createBlock(convertedBlocks[j]);
+        }
+    }
+}
+
+/**
+ * Parse any list of blocks from SB2 JSON into a list of VM-format blocks.
+ * Could be used to parse a top-level script,
+ * a list of blocks in a branch (e.g., in forever),
+ * or a list of blocks in an argument (e.g., move [pick random...]).
+ * @param {Array.<Object>} blockList SB2 JSON-format block list.
+ * @return {Array.<Object>} Scratch VM-format block list.
+ */
+function parseBlockList (blockList) {
+    var resultingList = [];
+    var previousBlock = null; // For setting next.
+    for (var i = 0; i < blockList.length; i++) {
+        var block = blockList[i];
+        var parsedBlock = parseBlock(block);
+        if (previousBlock) {
+            parsedBlock.parent = previousBlock.id;
+            previousBlock.next = parsedBlock.id;
+        }
+        previousBlock = parsedBlock;
+        resultingList.push(parsedBlock);
+    }
+    return resultingList;
+}
+
+/**
+ * Flatten a block tree into a block list.
+ * Children are temporarily stored on the `block.children` property.
+ * @param {Array.<Object>} blocks list generated by `parseBlockList`.
+ * @return {Array.<Object>} Flattened list to be passed to `blocks.createBlock`.
+ */
+function flatten (blocks) {
+    var finalBlocks = [];
+    for (var i = 0; i < blocks.length; i++) {
+        var block = blocks[i];
+        finalBlocks.push(block);
+        if (block.children) {
+            finalBlocks = finalBlocks.concat(flatten(block.children));
+        }
+        delete block.children;
+    }
+    return finalBlocks;
+}
+
+/**
+ * Convert a Scratch 2.0 procedure string (e.g., "my_procedure %s %b %n")
+ * into an argument map. This allows us to provide the expected inputs
+ * to a mutated procedure call.
+ * @param {string} procCode Scratch 2.0 procedure string.
+ * @return {Object} Argument map compatible with those in sb2specmap.
+ */
+function parseProcedureArgMap (procCode) {
+    var argMap = [
+        {} // First item in list is op string.
+    ];
+    var INPUT_PREFIX = 'input';
+    var inputCount = 0;
+    // Split by %n, %b, %s.
+    var parts = procCode.split(/(?=[^\\]\%[nbs])/);
+    for (var i = 0; i < parts.length; i++) {
+        var part = parts[i].trim();
+        if (part.substring(0, 1) == '%') {
+            var argType = part.substring(1, 2);
+            var arg = {
+                type: 'input',
+                inputName: INPUT_PREFIX + (inputCount++)
+            };
+            if (argType == 'n') {
+                arg.inputOp = 'math_number';
+            } else if (argType == 's') {
+                arg.inputOp = 'text';
+            }
+            argMap.push(arg);
+        }
+    }
+    return argMap;
+}
+
+/**
+ * Parse a single SB2 JSON-formatted block and its children.
+ * @param {!Object} sb2block SB2 JSON-formatted block.
+ * @return {Object} Scratch VM format block.
+ */
+function parseBlock (sb2block) {
+    // First item in block object is the old opcode (e.g., 'forward:').
+    var oldOpcode = sb2block[0];
+    // Convert the block using the specMap. See sb2specmap.js.
+    if (!oldOpcode || !specMap[oldOpcode]) {
+        console.warn('Couldn\'t find SB2 block: ', oldOpcode);
+        return;
+    }
+    var blockMetadata = specMap[oldOpcode];
+    // Block skeleton.
+    var activeBlock = {
+        id: uid(), // Generate a new block unique ID.
+        opcode: blockMetadata.opcode, // Converted, e.g. "motion_movesteps".
+        inputs: {}, // Inputs to this block and the blocks they point to.
+        fields: {}, // Fields on this block and their values.
+        next: null, // Next block.
+        shadow: false, // No shadow blocks in an SB2 by default.
+        children: [] // Store any generated children, flattened in `flatten`.
+    };
+    // For a procedure call, generate argument map from proc string.
+    if (oldOpcode == 'call') {
+        blockMetadata.argMap = parseProcedureArgMap(sb2block[1]);
+    }
+    // Look at the expected arguments in `blockMetadata.argMap.`
+    // The basic problem here is to turn positional SB2 arguments into
+    // non-positional named Scratch VM arguments.
+    for (var i = 0; i < blockMetadata.argMap.length; i++) {
+        var expectedArg = blockMetadata.argMap[i];
+        var providedArg = sb2block[i + 1]; // (i = 0 is opcode)
+        // Whether the input is obscuring a shadow.
+        var shadowObscured = false;
+        // Positional argument is an input.
+        if (expectedArg.type == 'input') {
+            // Create a new block and input metadata.
+            var inputUid = uid();
+            activeBlock.inputs[expectedArg.inputName] = {
+                name: expectedArg.inputName,
+                block: null,
+                shadow: null
+            };
+            if (typeof providedArg == 'object' && providedArg) {
+                // Block or block list occupies the input.
+                var innerBlocks;
+                if (typeof providedArg[0] == 'object' && providedArg[0]) {
+                    // Block list occupies the input.
+                    innerBlocks = parseBlockList(providedArg);
+                } else {
+                    // Single block occupies the input.
+                    innerBlocks = [parseBlock(providedArg)];
+                }
+                var previousBlock = null;
+                for (var j = 0; j < innerBlocks.length; j++) {
+                    if (j == 0) {
+                        innerBlocks[j].parent = activeBlock.id;
+                    } else {
+                        innerBlocks[j].parent = previousBlock;
+                    }
+                    previousBlock = innerBlocks[j].id;
+                }
+                // Obscures any shadow.
+                shadowObscured = true;
+                activeBlock.inputs[expectedArg.inputName].block = (
+                    innerBlocks[0].id
+                );
+                activeBlock.children = (
+                    activeBlock.children.concat(innerBlocks)
+                );
+            }
+            // Generate a shadow block to occupy the input.
+            if (!expectedArg.inputOp) {
+                // No editable shadow input; e.g., for a boolean.
+                continue;
+            }
+            // Each shadow has a field generated for it automatically.
+            // Value to be filled in the field.
+            var fieldValue = providedArg;
+            // Shadows' field names match the input name, except for these:
+            var fieldName = expectedArg.inputName;
+            if (expectedArg.inputOp == 'math_number' ||
+                expectedArg.inputOp == 'math_whole_number' ||
+                expectedArg.inputOp == 'math_positive_number' ||
+                expectedArg.inputOp == 'math_integer' ||
+                expectedArg.inputOp == 'math_angle') {
+                fieldName = 'NUM';
+                // Fields are given Scratch 2.0 default values if obscured.
+                if (shadowObscured) {
+                    fieldValue = 10;
+                }
+            } else if (expectedArg.inputOp == 'text') {
+                fieldName = 'TEXT';
+                if (shadowObscured) {
+                    fieldValue = '';
+                }
+            } else if (expectedArg.inputOp == 'colour_picker') {
+                // Convert SB2 color to hex.
+                fieldValue = Color.decimalToHex(providedArg);
+                fieldName = 'COLOUR';
+                if (shadowObscured) {
+                    fieldValue = '#990000';
+                }
+            }
+            var fields = {};
+            fields[fieldName] = {
+                name: fieldName,
+                value: fieldValue
+            };
+            activeBlock.children.push({
+                id: inputUid,
+                opcode: expectedArg.inputOp,
+                inputs: {},
+                fields: fields,
+                next: null,
+                topLevel: false,
+                parent: activeBlock.id,
+                shadow: true
+            });
+            activeBlock.inputs[expectedArg.inputName].shadow = inputUid;
+            // If no block occupying the input, alias to the shadow.
+            if (!activeBlock.inputs[expectedArg.inputName].block) {
+                activeBlock.inputs[expectedArg.inputName].block = inputUid;
+            }
+        } else if (expectedArg.type == 'field') {
+            // Add as a field on this block.
+            activeBlock.fields[expectedArg.fieldName] = {
+                name: expectedArg.fieldName,
+                value: providedArg
+            };
+        }
+    }
+    // Special cases to generate mutations.
+    if (oldOpcode == 'stopScripts') {
+        // Mutation for stop block: if the argument is 'other scripts',
+        // the block needs a next connection.
+        if (sb2block[1] == 'other scripts in sprite' ||
+            sb2block[1] == 'other scripts in stage') {
+            activeBlock.mutation = {
+                tagName: 'mutation',
+                hasnext: 'true',
+                children: []
+            };
+        }
+    } else if (oldOpcode == 'procDef') {
+        // Mutation for procedure definition:
+        // store all 2.0 proc data.
+        var procData = sb2block.slice(1);
+        activeBlock.mutation = {
+            tagName: 'mutation',
+            proccode: procData[0], // e.g., "abc %n %b %s"
+            argumentnames: JSON.stringify(procData[1]), // e.g. ['arg1', 'arg2']
+            argumentdefaults: JSON.stringify(procData[2]), // e.g., [1, 'abc']
+            warp: procData[3], // Warp mode, e.g., true/false.
+            children: []
+        };
+    } else if (oldOpcode == 'call') {
+        // Mutation for procedure call:
+        // string for proc code (e.g., "abc %n %b %s").
+        activeBlock.mutation = {
+            tagName: 'mutation',
+            children: [],
+            proccode: sb2block[1]
+        };
+    } else if (oldOpcode == 'getParam') {
+        // Mutation for procedure parameter.
+        activeBlock.mutation = {
+            tagName: 'mutation',
+            children: [],
+            paramname: sb2block[1], // Name of parameter.
+            shape: sb2block[2] // Shape - in 2.0, 'r' or 'b'.
+        };
+    }
+    return activeBlock;
+}
+
+module.exports = sb2import;
diff --git a/src/import/sb2specmap.js b/src/import/sb2specmap.js
new file mode 100644
index 000000000..1cf0620fc
--- /dev/null
+++ b/src/import/sb2specmap.js
@@ -0,0 +1,1388 @@
+/**
+ * @fileoverview
+ * The specMap below handles a few pieces of "translation" work between
+ * the SB2 JSON format and the data we need to run a project
+ * in the Scratch 3.0 VM.
+ * Notably:
+ *  - Map 2.0 and 1.4 opcodes (forward:) into 3.0-format (motion_movesteps).
+ *  - Map ordered, unnamed args to unordered, named inputs and fields.
+ * Keep this up-to-date as 3.0 blocks are renamed, changed, etc.
+ * Originally this was generated largely by a hand-guided scripting process.
+ * The relevant data lives here:
+ * https://github.com/LLK/scratch-flash/blob/master/src/Specs.as
+ * (for the old opcode and argument order).
+ * and here:
+ * https://github.com/LLK/scratch-blocks/tree/develop/blocks_vertical
+ * (for the new opcodes and argument names).
+ * and here:
+ * https://github.com/LLK/scratch-blocks/blob/develop/tests/
+ * (for the shadow blocks created for each block).
+ * I started with the `commands` array in Specs.as, and discarded irrelevant
+ * properties. By hand, I matched the opcode name to the 3.0 opcode.
+ * Finally, I filled in the expected arguments as below.
+ */
+var specMap = {
+    'forward:':{
+        'opcode':'motion_movesteps',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'STEPS'
+            }
+        ]
+    },
+    'turnRight:':{
+        'opcode':'motion_turnright',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'DEGREES'
+            }
+        ]
+    },
+    'turnLeft:':{
+        'opcode':'motion_turnleft',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'DEGREES'
+            }
+        ]
+    },
+    'heading:':{
+        'opcode':'motion_pointindirection',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_angle',
+                'inputName':'DIRECTION'
+            }
+        ]
+    },
+    'pointTowards:':{
+        'opcode':'motion_pointtowards',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'motion_pointtowards_menu',
+                'inputName':'TOWARDS'
+            }
+        ]
+    },
+    'gotoX:y:':{
+        'opcode':'motion_gotoxy',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'X'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'Y'
+            }
+        ]
+    },
+    'gotoSpriteOrMouse:':{
+        'opcode':'motion_goto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'motion_goto_menu',
+                'inputName':'TO'
+            }
+        ]
+    },
+    'glideSecs:toX:y:elapsed:from:':{
+        'opcode':'motion_glidesecstoxy',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SECS'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'X'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'Y'
+            }
+        ]
+    },
+    'changeXposBy:':{
+        'opcode':'motion_changexby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'DX'
+            }
+        ]
+    },
+    'xpos:':{
+        'opcode':'motion_setx',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'X'
+            }
+        ]
+    },
+    'changeYposBy:':{
+        'opcode':'motion_changeyby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'DY'
+            }
+        ]
+    },
+    'ypos:':{
+        'opcode':'motion_sety',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'Y'
+            }
+        ]
+    },
+    'bounceOffEdge':{
+        'opcode':'motion_ifonedgebounce',
+        'argMap':[
+        ]
+    },
+    'setRotationStyle':{
+        'opcode':'motion_setrotationstyle',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'motion_setrotationstyle_menu',
+                'inputName':'STYLE'
+            }
+        ]
+    },
+    'xpos':{
+        'opcode':'motion_xposition',
+        'argMap':[
+        ]
+    },
+    'ypos':{
+        'opcode':'motion_yposition',
+        'argMap':[
+        ]
+    },
+    'heading':{
+        'opcode':'motion_direction',
+        'argMap':[
+        ]
+    },
+    'say:duration:elapsed:from:':{
+        'opcode':'looks_sayforsecs',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'MESSAGE'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SECS'
+            }
+        ]
+    },
+    'say:':{
+        'opcode':'looks_say',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'MESSAGE'
+            }
+        ]
+    },
+    'think:duration:elapsed:from:':{
+        'opcode':'looks_thinkforsecs',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'MESSAGE'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SECS'
+            }
+        ]
+    },
+    'think:':{
+        'opcode':'looks_think',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'MESSAGE'
+            }
+        ]
+    },
+    'show':{
+        'opcode':'looks_show',
+        'argMap':[
+        ]
+    },
+    'hide':{
+        'opcode':'looks_hide',
+        'argMap':[
+        ]
+    },
+    'lookLike:':{
+        'opcode':'looks_switchcostumeto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'looks_costume',
+                'inputName':'COSTUME'
+            }
+        ]
+    },
+    'nextCostume':{
+        'opcode':'looks_nextcostume',
+        'argMap':[
+        ]
+    },
+    'startScene':{
+        'opcode':'looks_switchbackdropto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'looks_backdrops',
+                'inputName':'BACKDROP'
+            }
+        ]
+    },
+    'changeGraphicEffect:by:':{
+        'opcode':'looks_changeeffectby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'looks_effectmenu',
+                'inputName':'EFFECT'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'CHANGE'
+            }
+        ]
+    },
+    'setGraphicEffect:to:':{
+        'opcode':'looks_seteffectto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'looks_effectmenu',
+                'inputName':'EFFECT'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'VALUE'
+            }
+        ]
+    },
+    'filterReset':{
+        'opcode':'looks_cleargraphiceffects',
+        'argMap':[
+        ]
+    },
+    'changeSizeBy:':{
+        'opcode':'looks_changesizeby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'CHANGE'
+            }
+        ]
+    },
+    'setSizeTo:':{
+        'opcode':'looks_setsizeto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SIZE'
+            }
+        ]
+    },
+    'comeToFront':{
+        'opcode':'looks_gotofront',
+        'argMap':[
+        ]
+    },
+    'goBackByLayers:':{
+        'opcode':'looks_gobacklayers',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_integer',
+                'inputName':'NUM'
+            }
+        ]
+    },
+    'costumeIndex':{
+        'opcode':'looks_costumeorder',
+        'argMap':[
+        ]
+    },
+    'sceneName':{
+        'opcode':'looks_backdropname',
+        'argMap':[
+        ]
+    },
+    'scale':{
+        'opcode':'looks_size',
+        'argMap':[
+        ]
+    },
+    'startSceneAndWait':{
+        'opcode':'looks_switchbackdroptoandwait',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'looks_backdrops',
+                'inputName':'BACKDROP'
+            }
+        ]
+    },
+    'nextScene':{
+        'opcode':'looks_nextbackdrop',
+        'argMap':[
+        ]
+    },
+    'backgroundIndex':{
+        'opcode':'looks_backdroporder',
+        'argMap':[
+        ]
+    },
+    'playSound:':{
+        'opcode':'sound_play',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sound_sounds_option',
+                'inputName':'SOUND_MENU'
+            }
+        ]
+    },
+    'doPlaySoundAndWait':{
+        'opcode':'sound_playuntildone',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sound_sounds_option',
+                'inputName':'SOUND_MENU'
+            }
+        ]
+    },
+    'stopAllSounds':{
+        'opcode':'sound_stopallsounds',
+        'argMap':[
+        ]
+    },
+    'playDrum':{
+        'opcode':'sound_playdrumforbeats',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'DRUMTYPE'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'BEATS'
+            }
+        ]
+    },
+    'rest:elapsed:from:':{
+        'opcode':'sound_restforbeats',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'BEATS'
+            }
+        ]
+    },
+    'noteOn:duration:elapsed:from:':{
+        'opcode':'sound_playnoteforbeats',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NOTE'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'BEATS'
+            }
+        ]
+    },
+    'instrument:':{
+        'opcode':'sound_setinstrumentto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'INSTRUMENT'
+            }
+        ]
+    },
+    'changeVolumeBy:':{
+        'opcode':'sound_changevolumeby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'VOLUME'
+            }
+        ]
+    },
+    'setVolumeTo:':{
+        'opcode':'sound_setvolumeto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'VOLUME'
+            }
+        ]
+    },
+    'volume':{
+        'opcode':'sound_volume',
+        'argMap':[
+        ]
+    },
+    'changeTempoBy:':{
+        'opcode':'sound_changetempoby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'TEMPO'
+            }
+        ]
+    },
+    'setTempoTo:':{
+        'opcode':'sound_settempotobpm',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'TEMPO'
+            }
+        ]
+    },
+    'tempo':{
+        'opcode':'sound_tempo',
+        'argMap':[
+        ]
+    },
+    'clearPenTrails':{
+        'opcode':'pen_clear',
+        'argMap':[
+        ]
+    },
+    'stampCostume':{
+        'opcode':'pen_stamp',
+        'argMap':[
+        ]
+    },
+    'putPenDown':{
+        'opcode':'pen_pendown',
+        'argMap':[
+        ]
+    },
+    'putPenUp':{
+        'opcode':'pen_penup',
+        'argMap':[
+        ]
+    },
+    'penColor:':{
+        'opcode':'pen_setpencolortocolor',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'colour_picker',
+                'inputName':'COLOR'
+            }
+        ]
+    },
+    'changePenHueBy:':{
+        'opcode':'pen_changepencolorby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'COLOR'
+            }
+        ]
+    },
+    'setPenHueTo:':{
+        'opcode':'pen_setpencolortonum',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'COLOR'
+            }
+        ]
+    },
+    'changePenShadeBy:':{
+        'opcode':'pen_changepenshadeby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SHADE'
+            }
+        ]
+    },
+    'setPenShadeTo:':{
+        'opcode':'pen_changepenshadeby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SHADE'
+            }
+        ]
+    },
+    'changePenSizeBy:':{
+        'opcode':'pen_changepensizeby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SIZE'
+            }
+        ]
+    },
+    'penSize:':{
+        'opcode':'pen_setpensizeto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'SIZE'
+            }
+        ]
+    },
+    'whenGreenFlag':{
+        'opcode':'event_whenflagclicked',
+        'argMap':[
+        ]
+    },
+    'whenKeyPressed':{
+        'opcode':'event_whenkeypressed',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'KEY_OPTION'
+            }
+        ]
+    },
+    'whenClicked':{
+        'opcode':'event_whenthisspriteclicked',
+        'argMap':[
+        ]
+    },
+    'whenSceneStarts':{
+        'opcode':'event_whenbackdropswitchesto',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'BACKDROP'
+            }
+        ]
+    },
+    'whenSensorGreaterThan':{
+        'opcode':'event_whengreaterthan',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'WHENGREATERTHANMENU'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'VALUE'
+            }
+        ]
+    },
+    'whenIReceive':{
+        'opcode':'event_whenbroadcastreceived',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'BROADCAST_OPTION'
+            }
+        ]
+    },
+    'broadcast:':{
+        'opcode':'event_broadcast',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'event_broadcast_menu',
+                'inputName':'BROADCAST_OPTION'
+            }
+        ]
+    },
+    'doBroadcastAndWait':{
+        'opcode':'event_broadcastandwait',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'event_broadcast_menu',
+                'inputName':'BROADCAST_OPTION'
+            }
+        ]
+    },
+    'wait:elapsed:from:':{
+        'opcode':'control_wait',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_positive_number',
+                'inputName':'DURATION'
+            }
+        ]
+    },
+    'doRepeat':{
+        'opcode':'control_repeat',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_whole_number',
+                'inputName':'TIMES'
+            },
+            {
+                'type':'input',
+                'inputName': 'SUBSTACK'
+            }
+        ]
+    },
+    'doForever':{
+        'opcode':'control_forever',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'SUBSTACK'
+            }
+        ]
+    },
+    'doIf':{
+        'opcode':'control_if',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'CONDITION'
+            },
+            {
+                'type':'input',
+                'inputName':'SUBSTACK'
+            }
+        ]
+    },
+    'doIfElse':{
+        'opcode':'control_if_else',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'CONDITION'
+            },
+            {
+                'type':'input',
+                'inputName':'SUBSTACK'
+            },
+            {
+                'type':'input',
+                'inputName':'SUBSTACK2'
+            }
+        ]
+    },
+    'doWaitUntil':{
+        'opcode':'control_wait_until',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'CONDITION'
+            }
+        ]
+    },
+    'doUntil':{
+        'opcode':'control_repeat_until',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'CONDITION'
+            },
+            {
+                'type':'input',
+                'inputName':'SUBSTACK'
+            }
+        ]
+    },
+    'stopScripts':{
+        'opcode':'control_stop',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'STOP_OPTION'
+            }
+        ]
+    },
+    'whenCloned':{
+        'opcode':'control_start_as_clone',
+        'argMap':[
+        ]
+    },
+    'createCloneOf':{
+        'opcode':'control_create_clone_of',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'control_create_clone_of_menu',
+                'inputName':'CLONE_OPTION'
+            }
+        ]
+    },
+    'deleteClone':{
+        'opcode':'control_delete_this_clone',
+        'argMap':[
+        ]
+    },
+    'touching:':{
+        'opcode':'sensing_touchingobject',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sensing_touchingobjectmenu',
+                'inputName':'TOUCHINGOBJECTMENU'
+            }
+        ]
+    },
+    'touchingColor:':{
+        'opcode':'sensing_touchingcolor',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'colour_picker',
+                'inputName':'COLOR'
+            }
+        ]
+    },
+    'color:sees:':{
+        'opcode':'sensing_coloristouchingcolor',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'colour_picker',
+                'inputName':'COLOR'
+            },
+            {
+                'type':'input',
+                'inputOp':'colour_picker',
+                'inputName':'COLOR2'
+            }
+        ]
+    },
+    'distanceTo:':{
+        'opcode':'sensing_distanceto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sensing_distancetomenu',
+                'inputName':'DISTANCETOMENU'
+            }
+        ]
+    },
+    'doAsk':{
+        'opcode':'sensing_askandwait',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'QUESTION'
+            }
+        ]
+    },
+    'answer':{
+        'opcode':'sensing_answer',
+        'argMap':[
+        ]
+    },
+    'keyPressed:':{
+        'opcode':'sensing_keypressed',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sensing_keyoptions',
+                'inputName':'KEY_OPTION'
+            }
+        ]
+    },
+    'mousePressed':{
+        'opcode':'sensing_mousedown',
+        'argMap':[
+        ]
+    },
+    'mouseX':{
+        'opcode':'sensing_mousex',
+        'argMap':[
+        ]
+    },
+    'mouseY':{
+        'opcode':'sensing_mousey',
+        'argMap':[
+        ]
+    },
+    'soundLevel':{
+        'opcode':'sensing_loudness',
+        'argMap':[
+        ]
+    },
+    'senseVideoMotion':{
+        'opcode':'sensing_videoon',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sensing_videoonmenuone',
+                'inputName':'VIDEOONMENU1'
+            },
+            {
+                'type':'input',
+                'inputOp':'sensing_videoonmenutwo',
+                'inputName':'VIDEOONMENU2'
+            }
+        ]
+    },
+    'setVideoState':{
+        'opcode':'sensing_videotoggle',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sensing_videotogglemenu',
+                'inputName':'VIDEOTOGGLEMENU'
+            }
+        ]
+    },
+    'setVideoTransparency':{
+        'opcode':'sensing_setvideotransparency',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'TRANSPARENCY'
+            }
+        ]
+    },
+    'timer':{
+        'opcode':'sensing_timer',
+        'argMap':[
+        ]
+    },
+    'timerReset':{
+        'opcode':'sensing_resettimer',
+        'argMap':[
+        ]
+    },
+    'getAttribute:of:':{
+        'opcode':'sensing_of',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sensing_of_property_menu',
+                'inputName':'PROPERTY'
+            },
+            {
+                'type':'input',
+                'inputOp':'sensing_of_object_menu',
+                'inputName':'OBJECT'
+            }
+        ]
+    },
+    'timeAndDate':{
+        'opcode':'sensing_current',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'sensing_currentmenu',
+                'inputName':'CURRENTMENU'
+            }
+        ]
+    },
+    'timestamp':{
+        'opcode':'sensing_dayssince2000',
+        'argMap':[
+        ]
+    },
+    'getUserName':{
+        'opcode':'sensing_username',
+        'argMap':[
+        ]
+    },
+    '+':{
+        'opcode':'operator_add',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM1'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM2'
+            }
+        ]
+    },
+    '-':{
+        'opcode':'operator_subtract',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM1'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM2'
+            }
+        ]
+    },
+    '*':{
+        'opcode':'operator_multiply',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM1'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM2'
+            }
+        ]
+    },
+    '/':{
+        'opcode':'operator_divide',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM1'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM2'
+            }
+        ]
+    },
+    'randomFrom:to:':{
+        'opcode':'operator_random',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'FROM'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'TO'
+            }
+        ]
+    },
+    '<':{
+        'opcode':'operator_lt',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'OPERAND1'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'OPERAND2'
+            }
+        ]
+    },
+    '=':{
+        'opcode':'operator_equals',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'OPERAND1'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'OPERAND2'
+            }
+        ]
+    },
+    '>':{
+        'opcode':'operator_gt',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'OPERAND1'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'OPERAND2'
+            }
+        ]
+    },
+    '&':{
+        'opcode':'operator_and',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'OPERAND1'
+            },
+            {
+                'type':'input',
+                'inputName':'OPERAND2'
+            }
+        ]
+    },
+    '|':{
+        'opcode':'operator_or',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'OPERAND1'
+            },
+            {
+                'type':'input',
+                'inputName':'OPERAND2'
+            }
+        ]
+    },
+    'not':{
+        'opcode':'operator_not',
+        'argMap':[
+            {
+                'type':'input',
+                'inputName':'OPERAND'
+            }
+        ]
+    },
+    'concatenate:with:':{
+        'opcode':'operator_join',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'STRING1'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'STRING2'
+            }
+        ]
+    },
+    'letter:of:':{
+        'opcode':'operator_letter_of',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_whole_number',
+                'inputName':'LETTER'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'STRING'
+            }
+        ]
+    },
+    'stringLength:':{
+        'opcode':'operator_length',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'STRING'
+            }
+        ]
+    },
+    '%':{
+        'opcode':'operator_mod',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM1'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM2'
+            }
+        ]
+    },
+    'rounded':{
+        'opcode':'operator_round',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM'
+            }
+        ]
+    },
+    'computeFunction:of:':{
+        'opcode':'operator_mathop',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'operator_mathop_menu',
+                'inputName':'OPERATOR'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'NUM'
+            }
+        ]
+    },
+    'readVariable':{
+        'opcode':'data_variable',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'data_variablemenu',
+                'inputName':'VARIABLE'
+            }
+        ]
+    },
+    'setVar:to:':{
+        'opcode':'data_setvariableto',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'data_variablemenu',
+                'inputName':'VARIABLE'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'VALUE'
+            }
+        ]
+    },
+    'changeVar:by:':{
+        'opcode':'data_changevariableby',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'data_variablemenu',
+                'inputName':'VARIABLE'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_number',
+                'inputName':'VALUE'
+            }
+        ]
+    },
+    'showVariable:':{
+        'opcode':'data_showvariable',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'data_variablemenu',
+                'inputName':'VARIABLE'
+            }
+        ]
+    },
+    'hideVariable:':{
+        'opcode':'data_hidevariable',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'data_variablemenu',
+                'inputName':'VARIABLE'
+            }
+        ]
+    },
+    'contentsOfList:':{
+        'opcode':'data_list',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'append:toList:':{
+        'opcode':'data_addtolist',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'ITEM'
+            },
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'deleteLine:ofList:':{
+        'opcode':'data_deleteoflist',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_integer',
+                'inputName':'INDEX'
+            },
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'insert:at:ofList:':{
+        'opcode':'data_insertatlist',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'ITEM'
+            },
+            {
+                'type':'input',
+                'inputOp':'math_integer',
+                'inputName':'INDEX'
+            },
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'setLine:ofList:to:':{
+        'opcode':'data_replaceitemoflist',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_integer',
+                'inputName':'INDEX'
+            },
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'ITEM'
+            }
+        ]
+    },
+    'getLine:ofList:':{
+        'opcode':'data_itemoflist',
+        'argMap':[
+            {
+                'type':'input',
+                'inputOp':'math_integer',
+                'inputName':'INDEX'
+            },
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'lineCountOfList:':{
+        'opcode':'data_lengthoflist',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'list:contains:':{
+        'opcode':'data_listcontainsitem',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            },
+            {
+                'type':'input',
+                'inputOp':'text',
+                'inputName':'ITEM'
+            }
+        ]
+    },
+    'showList:':{
+        'opcode':'data_showlist',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'hideList:':{
+        'opcode':'data_hidelist',
+        'argMap':[
+            {
+                'type':'field',
+                'fieldName':'LIST'
+            }
+        ]
+    },
+    'procDef':{
+        'opcode':'procedures_defnoreturn',
+        'argMap':[]
+    },
+    'getParam':{
+        'opcode':'procedures_param',
+        'argMap':[]
+    },
+    'call':{
+        'opcode':'procedures_callnoreturn',
+        'argMap':[]
+    }
+};
+module.exports = specMap;
diff --git a/src/index.js b/src/index.js
index d6e05e970..014dc2b23 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,7 +2,9 @@ var EventEmitter = require('events');
 var util = require('util');
 
 var Runtime = require('./engine/runtime');
-var adapter = require('./engine/adapter');
+var sb2import = require('./import/sb2import');
+var Sprite = require('./sprites/sprite');
+var Blocks = require('./engine/blocks');
 
 /**
  * Handles connections between blocks, stage, and extensions.
@@ -11,73 +13,38 @@ var adapter = require('./engine/adapter');
  */
 function VirtualMachine () {
     var instance = this;
-
     // Bind event emitter and runtime to VM instance
-    // @todo Post message (Web Worker) polyfill
     EventEmitter.call(instance);
-    instance.runtime = new Runtime();
-
     /**
-     * Event listener for blocks. Handles validation and serves as a generic
-     * adapter between the blocks and the runtime interface.
-     *
-     * @param {Object} Blockly "block" event
+     * VM runtime, to store blocks, I/O devices, sprites/targets, etc.
+     * @type {!Runtime}
      */
-    instance.blockListener = function (e) {
-        // Validate event
-        if (typeof e !== 'object') return;
-        if (typeof e.blockId !== 'string') return;
+    instance.runtime = new Runtime();
+    /**
+     * The "currently editing"/selected target ID for the VM.
+     * Block events from any Blockly workspace are routed to this target.
+     * @type {!string}
+     */
+    instance.editingTarget = null;
+    // Runtime emits are passed along as VM emits.
+    instance.runtime.on(Runtime.SCRIPT_GLOW_ON, function (id) {
+        instance.emit(Runtime.SCRIPT_GLOW_ON, {id: id});
+    });
+    instance.runtime.on(Runtime.SCRIPT_GLOW_OFF, function (id) {
+        instance.emit(Runtime.SCRIPT_GLOW_OFF, {id: id});
+    });
+    instance.runtime.on(Runtime.BLOCK_GLOW_ON, function (id) {
+        instance.emit(Runtime.BLOCK_GLOW_ON, {id: id});
+    });
+    instance.runtime.on(Runtime.BLOCK_GLOW_OFF, function (id) {
+        instance.emit(Runtime.BLOCK_GLOW_OFF, {id: id});
+    });
+    instance.runtime.on(Runtime.VISUAL_REPORT, function (id, value) {
+        instance.emit(Runtime.VISUAL_REPORT, {id: id, value: value});
+    });
 
-        // Blocks
-        switch (e.type) {
-        case 'create':
-            instance.runtime.createBlock(adapter(e), false);
-            break;
-        case 'change':
-            instance.runtime.changeBlock({
-                id: e.blockId,
-                element: e.element,
-                name: e.name,
-                value: e.newValue
-            });
-            break;
-        case 'move':
-            instance.runtime.moveBlock({
-                id: e.blockId,
-                oldParent: e.oldParentId,
-                oldField: e.oldInputName,
-                newParent: e.newParentId,
-                newField: e.newInputName
-            });
-            break;
-        case 'delete':
-            instance.runtime.deleteBlock({
-                id: e.blockId
-            });
-            break;
-        }
-    };
-
-    instance.flyoutBlockListener = function (e) {
-        switch (e.type) {
-        case 'create':
-            instance.runtime.createBlock(adapter(e), true);
-            break;
-        case 'change':
-            instance.runtime.changeBlock({
-                id: e.blockId,
-                element: e.element,
-                name: e.name,
-                value: e.newValue
-            });
-            break;
-        case 'delete':
-            instance.runtime.deleteBlock({
-                id: e.blockId
-            });
-            break;
-        }
-    };
+    this.blockListener = this.blockListener.bind(this);
+    this.flyoutBlockListener = this.flyoutBlockListener.bind(this);
 }
 
 /**
@@ -86,7 +53,259 @@ function VirtualMachine () {
 util.inherits(VirtualMachine, EventEmitter);
 
 /**
- * Export and bind to `window`
+ * Start running the VM - do this before anything else.
  */
+VirtualMachine.prototype.start = function () {
+    this.runtime.start();
+};
+
+/**
+ * "Green flag" handler - start all threads starting with a green flag.
+ */
+VirtualMachine.prototype.greenFlag = function () {
+    this.runtime.greenFlag();
+};
+
+/**
+ * Set whether the VM is in "turbo mode."
+ * When true, loops don't yield to redraw.
+ * @param {Boolean} turboModeOn Whether turbo mode should be set.
+ */
+VirtualMachine.prototype.setTurboMode = function (turboModeOn) {
+    this.runtime.turboMode = !!turboModeOn;
+};
+
+/**
+ * Set whether the VM is in "pause mode."
+ * When true, nothing is stepped.
+ * @param {Boolean} pauseModeOn Whether pause mode should be set.
+ */
+VirtualMachine.prototype.setPauseMode = function (pauseModeOn) {
+    this.runtime.setPauseMode(!!pauseModeOn);
+};
+
+/**
+ * Set whether the VM is in 2.0 "compatibility mode."
+ * When true, ticks go at 2.0 speed (30 TPS).
+ * @param {Boolean} compatibilityModeOn Whether compatibility mode is set.
+ */
+VirtualMachine.prototype.setCompatibilityMode = function (compatibilityModeOn) {
+    this.runtime.setCompatibilityMode(!!compatibilityModeOn);
+};
+
+/**
+ * Set whether the VM is in "single stepping mode."
+ * When true, blocks execute slowly and are highlighted visually.
+ * @param {Boolean} singleSteppingOn Whether single-stepping mode is set.
+ */
+VirtualMachine.prototype.setSingleSteppingMode = function (singleSteppingOn) {
+    this.runtime.setSingleSteppingMode(!!singleSteppingOn);
+};
+
+
+/**
+ * Set single-stepping mode speed.
+ * When in single-stepping mode, adjusts the speed of execution.
+ * @param {Number} speed Interval length in ms.
+ */
+VirtualMachine.prototype.setSingleSteppingSpeed = function (speed) {
+    this.runtime.setSingleSteppingSpeed(speed);
+};
+
+
+/**
+ * Stop all threads and running activities.
+ */
+VirtualMachine.prototype.stopAll = function () {
+    this.runtime.stopAll();
+};
+
+/**
+ * Clear out current running project data.
+ */
+VirtualMachine.prototype.clear = function () {
+    this.runtime.dispose();
+    this.editingTarget = null;
+    this.emitTargetsUpdate();
+};
+
+/**
+ * Get data for playground. Data comes back in an emitted event.
+ */
+VirtualMachine.prototype.getPlaygroundData = function () {
+    var instance = this;
+    // Only send back thread data for the current editingTarget.
+    var threadData = this.runtime.threads.filter(function(thread) {
+        return thread.target == instance.editingTarget;
+    });
+    // Remove the target key, since it's a circular reference.
+    var filteredThreadData = JSON.stringify(threadData, function(key, value) {
+        if (key == 'target') return undefined;
+        return value;
+    }, 2);
+    this.emit('playgroundData', {
+        blocks: this.editingTarget.blocks,
+        threads: filteredThreadData
+    });
+};
+
+/**
+ * Handle an animation frame.
+ */
+VirtualMachine.prototype.animationFrame = function () {
+    this.runtime.animationFrame();
+};
+
+/**
+ * Post I/O data to the virtual devices.
+ * @param {?string} device Name of virtual I/O device.
+ * @param {Object} data Any data object to post to the I/O device.
+ */
+VirtualMachine.prototype.postIOData = function (device, data) {
+    if (this.runtime.ioDevices[device]) {
+        this.runtime.ioDevices[device].postData(data);
+    }
+};
+
+/**
+ * Load a project from a Scratch 2.0 JSON representation.
+ * @param {?string} json JSON string representing the project.
+ */
+VirtualMachine.prototype.loadProject = function (json) {
+    this.clear();
+    // @todo: Handle other formats, e.g., Scratch 1.4, Scratch 3.0.
+    sb2import(json, this.runtime);
+    // Select the first target for editing, e.g., the stage.
+    this.editingTarget = this.runtime.targets[0];
+    // Update the VM user's knowledge of targets and blocks on the workspace.
+    this.emitTargetsUpdate();
+    this.emitWorkspaceUpdate();
+    this.runtime.setEditingTarget(this.editingTarget);
+};
+
+/**
+ * Temporary way to make an empty project, in case the desired project
+ * cannot be loaded from the online server.
+ */
+VirtualMachine.prototype.createEmptyProject = function () {
+    // Stage.
+    var blocks2 = new Blocks();
+    var stage = new Sprite(blocks2, this.runtime);
+    stage.name = 'Stage';
+    stage.costumes.push({
+        skin: './assets/stage.png',
+        name: 'backdrop1',
+        bitmapResolution: 2,
+        rotationCenterX: 480,
+        rotationCenterY: 360
+    });
+    var target2 = stage.createClone();
+    this.runtime.targets.push(target2);
+    target2.x = 0;
+    target2.y = 0;
+    target2.direction = 90;
+    target2.size = 200;
+    target2.visible = true;
+    target2.isStage = true;
+    // Sprite1 (cat).
+    var blocks1 = new Blocks();
+    var sprite = new Sprite(blocks1, this.runtime);
+    sprite.name = 'Sprite1';
+    sprite.costumes.push({
+        skin: './assets/scratch_cat.svg',
+        name: 'costume1',
+        bitmapResolution: 1,
+        rotationCenterX: 47,
+        rotationCenterY: 55
+    });
+    var target1 = sprite.createClone();
+    this.runtime.targets.push(target1);
+    target1.x = 0;
+    target1.y = 0;
+    target1.direction = 90;
+    target1.size = 100;
+    target1.visible = true;
+    this.editingTarget = this.runtime.targets[0];
+    this.emitTargetsUpdate();
+    this.emitWorkspaceUpdate();
+};
+
+/**
+ * Set the renderer for the VM/runtime
+ * @param {!RenderWebGL} renderer The renderer to attach
+ */
+VirtualMachine.prototype.attachRenderer = function (renderer) {
+    this.runtime.attachRenderer(renderer);
+};
+
+/**
+ * Handle a Blockly event for the current editing target.
+ * @param {!Blockly.Event} e Any Blockly event.
+ */
+VirtualMachine.prototype.blockListener = function (e) {
+    if (this.editingTarget) {
+        this.editingTarget.blocks.blocklyListen(e, this.runtime);
+    }
+};
+
+/**
+ * Handle a Blockly event for the flyout.
+ * @param {!Blockly.Event} e Any Blockly event.
+ */
+VirtualMachine.prototype.flyoutBlockListener = function (e) {
+    this.runtime.flyoutBlocks.blocklyListen(e, this.runtime);
+};
+
+/**
+ * Set an editing target. An editor UI can use this function to switch
+ * between editing different targets, sprites, etc.
+ * After switching the editing target, the VM may emit updates
+ * to the list of targets and any attached workspace blocks
+ * (see `emitTargetsUpdate` and `emitWorkspaceUpdate`).
+ * @param {string} targetId Id of target to set as editing.
+ */
+VirtualMachine.prototype.setEditingTarget = function (targetId) {
+    // Has the target id changed? If not, exit.
+    if (targetId == this.editingTarget.id) {
+        return;
+    }
+    var target = this.runtime.getTargetById(targetId);
+    if (target) {
+        this.editingTarget = target;
+        // Emit appropriate UI updates.
+        this.emitTargetsUpdate();
+        this.emitWorkspaceUpdate();
+        this.runtime.setEditingTarget(target);
+    }
+};
+
+/**
+ * Emit metadata about available targets.
+ * An editor UI could use this to display a list of targets and show
+ * the currently editing one.
+ */
+VirtualMachine.prototype.emitTargetsUpdate = function () {
+    this.emit('targetsUpdate', {
+        // [[target id, human readable target name], ...].
+        targetList: this.runtime.targets.filter(function (target) {
+            // Don't report clones.
+            return !target.hasOwnProperty('isOriginal') || target.isOriginal;
+        }).map(function(target) {
+            return [target.id, target.getName()];
+        }),
+        // Currently editing target id.
+        editingTarget: this.editingTarget ? this.editingTarget.id : null
+    });
+};
+
+/**
+ * Emit an Blockly/scratch-blocks compatible XML representation
+ * of the current editing target's blocks.
+ */
+VirtualMachine.prototype.emitWorkspaceUpdate = function () {
+    this.emit('workspaceUpdate', {
+        'xml': this.editingTarget.blocks.toXML()
+    });
+};
+
 module.exports = VirtualMachine;
-if (typeof window !== 'undefined') window.VirtualMachine = module.exports;
diff --git a/src/io/clock.js b/src/io/clock.js
new file mode 100644
index 000000000..ce4c8f553
--- /dev/null
+++ b/src/io/clock.js
@@ -0,0 +1,37 @@
+var Timer = require('../util/timer');
+
+function Clock (runtime) {
+    this._projectTimer = new Timer();
+    this._projectTimer.start();
+    this._pausedTime = null;
+    this._paused = false;
+    /**
+     * Reference to the owning Runtime.
+     * @type{!Runtime}
+     */
+    this.runtime = runtime;
+}
+
+Clock.prototype.projectTimer = function () {
+    if (this._paused) {
+        return this._pausedTime / 1000;
+    }
+    return this._projectTimer.timeElapsed() / 1000;
+};
+
+Clock.prototype.pause = function () {
+    this._paused = true;
+    this._pausedTime = this._projectTimer.timeElapsed();
+};
+
+Clock.prototype.resume = function () {
+    this._paused = false;
+    var dt = this._projectTimer.timeElapsed() - this._pausedTime;
+    this._projectTimer.startTime += dt;
+};
+
+Clock.prototype.resetProjectTimer = function () {
+    this._projectTimer.start();
+};
+
+module.exports = Clock;
diff --git a/src/io/keyboard.js b/src/io/keyboard.js
new file mode 100644
index 000000000..ea423fd40
--- /dev/null
+++ b/src/io/keyboard.js
@@ -0,0 +1,85 @@
+var Cast = require('../util/cast');
+
+function Keyboard (runtime) {
+    /**
+     * List of currently pressed keys.
+     * @type{Array.<number>}
+     */
+    this._keysPressed = [];
+    /**
+     * Reference to the owning Runtime.
+     * Can be used, for example, to activate hats.
+     * @type{!Runtime}
+     */
+    this.runtime = runtime;
+}
+
+/**
+ * Convert a Scratch key name to a DOM keyCode.
+ * @param {Any} keyName Scratch key argument.
+ * @return {number} Key code corresponding to a DOM event.
+ */
+Keyboard.prototype._scratchKeyToKeyCode = function (keyName) {
+    if (typeof keyName == 'number') {
+        // Key codes placed in with number blocks.
+        return keyName;
+    }
+    var keyString = Cast.toString(keyName);
+    switch (keyString) {
+    case 'space': return 32;
+    case 'left arrow': return 37;
+    case 'up arrow': return 38;
+    case 'right arrow': return 39;
+    case 'down arrow': return 40;
+    // @todo: Consider adding other special keys here.
+    }
+    // Keys reported by DOM keyCode are upper case.
+    return keyString.toUpperCase().charCodeAt(0);
+};
+
+Keyboard.prototype._keyCodeToScratchKey = function (keyCode) {
+    if (keyCode >= 48 && keyCode <= 90) {
+        // Standard letter.
+        return String.fromCharCode(keyCode).toLowerCase();
+    }
+    switch (keyCode) {
+    case 32: return 'space';
+    case 37: return 'left arrow';
+    case 38: return 'up arrow';
+    case 39: return 'right arrow';
+    case 40: return 'down arrow';
+    }
+    return null;
+};
+
+Keyboard.prototype.postData = function (data) {
+    if (data.keyCode) {
+        var index = this._keysPressed.indexOf(data.keyCode);
+        if (data.isDown) {
+            // If not already present, add to the list.
+            if (index < 0) {
+                this._keysPressed.push(data.keyCode);
+            }
+            // Always trigger hats, even if it was already pressed.
+            this.runtime.startHats('event_whenkeypressed', {
+                'KEY_OPTION': this._keyCodeToScratchKey(data.keyCode)
+            });
+            this.runtime.startHats('event_whenkeypressed', {
+                'KEY_OPTION': 'any'
+            });
+        } else if (index > -1) {
+            // If already present, remove from the list.
+            this._keysPressed.splice(index, 1);
+        }
+    }
+};
+
+Keyboard.prototype.getKeyIsDown = function (key) {
+    if (key == 'any') {
+        return this._keysPressed.length > 0;
+    }
+    var keyCode = this._scratchKeyToKeyCode(key);
+    return this._keysPressed.indexOf(keyCode) > -1;
+};
+
+module.exports = Keyboard;
diff --git a/src/io/mouse.js b/src/io/mouse.js
new file mode 100644
index 000000000..6b9860ee7
--- /dev/null
+++ b/src/io/mouse.js
@@ -0,0 +1,57 @@
+var MathUtil = require('../util/math-util');
+
+function Mouse (runtime) {
+    this._x = 0;
+    this._y = 0;
+    this._isDown = false;
+    /**
+     * Reference to the owning Runtime.
+     * Can be used, for example, to activate hats.
+     * @type{!Runtime}
+     */
+    this.runtime = runtime;
+}
+
+Mouse.prototype.postData = function(data) {
+    if (data.x) {
+        this._x = data.x - data.canvasWidth / 2;
+    }
+    if (data.y) {
+        this._y = data.y - data.canvasHeight / 2;
+    }
+    if (typeof data.isDown !== 'undefined') {
+        this._isDown = data.isDown;
+        if (this._isDown) {
+            this._activateClickHats(data.x, data.y);
+        }
+    }
+};
+
+Mouse.prototype._activateClickHats = function (x, y) {
+    if (this.runtime.renderer) {
+        var drawableID = this.runtime.renderer.pick(x, y);
+        for (var i = 0; i < this.runtime.targets.length; i++) {
+            var target = this.runtime.targets[i];
+            if (target.hasOwnProperty('drawableID') &&
+                target.drawableID == drawableID) {
+                this.runtime.startHats('event_whenthisspriteclicked',
+                    null, target);
+                return;
+            }
+        }
+    }
+};
+
+Mouse.prototype.getX = function () {
+    return MathUtil.clamp(this._x, -240, 240);
+};
+
+Mouse.prototype.getY = function () {
+    return MathUtil.clamp(-this._y, -180, 180);
+};
+
+Mouse.prototype.getIsDown = function () {
+    return this._isDown;
+};
+
+module.exports = Mouse;
diff --git a/src/sprites/clone.js b/src/sprites/clone.js
new file mode 100644
index 000000000..13d9434a9
--- /dev/null
+++ b/src/sprites/clone.js
@@ -0,0 +1,588 @@
+var util = require('util');
+var MathUtil = require('../util/math-util');
+var Target = require('../engine/target');
+
+/**
+ * Clone (instance) of a sprite.
+ * @param {!Sprite} sprite Reference to the sprite.
+ * @param {Runtime} runtime Reference to the runtime.
+ * @constructor
+ */
+function Clone(sprite, runtime) {
+    Target.call(this, sprite.blocks);
+    this.runtime = runtime;
+    /**
+     * Reference to the sprite that this is a clone of.
+     * @type {!Sprite}
+     */
+    this.sprite = sprite;
+    /**
+     * Reference to the global renderer for this VM, if one exists.
+     * @type {?RenderWebGLWorker}
+     */
+    this.renderer = null;
+    if (this.runtime) {
+        this.renderer = this.runtime.renderer;
+    }
+    /**
+     * ID of the drawable for this clone returned by the renderer, if rendered.
+     * @type {?Number}
+     */
+    this.drawableID = null;
+
+    /**
+     * Map of current graphic effect values.
+     * @type {!Object.<string, number>}
+     */
+    this.effects = {
+        'color': 0,
+        'fisheye': 0,
+        'whirl': 0,
+        'pixelate': 0,
+        'mosaic': 0,
+        'brightness': 0,
+        'ghost': 0
+    };
+}
+util.inherits(Clone, Target);
+
+/**
+ * Create a clone's drawable with the this.renderer.
+ */
+Clone.prototype.initDrawable = function () {
+    if (this.renderer) {
+        this.drawableID = this.renderer.createDrawable();
+    }
+    // If we're a clone, start the hats.
+    if (!this.isOriginal) {
+        this.runtime.startHats(
+            'control_start_as_clone', null, this
+        );
+    }
+};
+
+// Clone-level properties.
+/**
+ * Whether this represents an "original" clone, i.e., created by the editor
+ * and not clone blocks. In interface terms, this true for a "sprite."
+ * @type {boolean}
+ */
+Clone.prototype.isOriginal = true;
+
+/**
+ * Whether this clone represents the Scratch stage.
+ * @type {boolean}
+ */
+Clone.prototype.isStage = false;
+
+/**
+ * Scratch X coordinate. Currently should range from -240 to 240.
+ * @type {Number}
+ */
+Clone.prototype.x = 0;
+
+/**
+ * Scratch Y coordinate. Currently should range from -180 to 180.
+ * @type {number}
+ */
+Clone.prototype.y = 0;
+
+/**
+ * Scratch direction. Currently should range from -179 to 180.
+ * @type {number}
+ */
+Clone.prototype.direction = 90;
+
+/**
+ * Whether the clone is currently visible.
+ * @type {boolean}
+ */
+Clone.prototype.visible = true;
+
+/**
+ * Size of clone as a percent of costume size. Ranges from 5% to 535%.
+ * @type {number}
+ */
+Clone.prototype.size = 100;
+
+/**
+ * Currently selected costume index.
+ * @type {number}
+ */
+Clone.prototype.currentCostume = 0;
+
+/**
+ * Rotation style for "all around"/spinning.
+ * @enum
+ */
+Clone.ROTATION_STYLE_ALL_AROUND = 'all around';
+
+/**
+ * Rotation style for "left-right"/flipping.
+ * @enum
+ */
+Clone.ROTATION_STYLE_LEFT_RIGHT = 'left-right';
+
+/**
+ * Rotation style for "no rotation."
+ * @enum
+ */
+Clone.ROTATION_STYLE_NONE = 'don\'t rotate';
+
+/**
+ * Current rotation style.
+ * @type {!string}
+ */
+Clone.prototype.rotationStyle = Clone.ROTATION_STYLE_ALL_AROUND;
+
+// End clone-level properties.
+
+/**
+ * Set the X and Y coordinates of a clone.
+ * @param {!number} x New X coordinate of clone, in Scratch coordinates.
+ * @param {!number} y New Y coordinate of clone, in Scratch coordinates.
+ */
+Clone.prototype.setXY = function (x, y) {
+    if (this.isStage) {
+        return;
+    }
+    this.x = x;
+    this.y = y;
+    if (this.renderer) {
+        this.renderer.updateDrawableProperties(this.drawableID, {
+            position: [this.x, this.y]
+        });
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Get the rendered direction and scale, after applying rotation style.
+ * @return {Object<string, number>} Direction and scale to render.
+ */
+Clone.prototype._getRenderedDirectionAndScale = function () {
+    // Default: no changes to `this.direction` or `this.scale`.
+    var finalDirection = this.direction;
+    var finalScale = [this.size, this.size];
+    if (this.rotationStyle == Clone.ROTATION_STYLE_NONE) {
+        // Force rendered direction to be 90.
+        finalDirection = 90;
+    } else if (this.rotationStyle === Clone.ROTATION_STYLE_LEFT_RIGHT) {
+        // Force rendered direction to be 90, and flip drawable if needed.
+        finalDirection = 90;
+        var scaleFlip = (this.direction < 0) ? -1 : 1;
+        finalScale = [scaleFlip * this.size, this.size];
+    }
+    return {direction: finalDirection, scale: finalScale};
+};
+
+/**
+ * Set the direction of a clone.
+ * @param {!number} direction New direction of clone.
+ */
+Clone.prototype.setDirection = function (direction) {
+    if (this.isStage) {
+        return;
+    }
+    // Keep direction between -179 and +180.
+    this.direction = MathUtil.wrapClamp(direction, -179, 180);
+    if (this.renderer) {
+        var renderedDirectionScale = this._getRenderedDirectionAndScale();
+        this.renderer.updateDrawableProperties(this.drawableID, {
+            direction: renderedDirectionScale.direction,
+            scale: renderedDirectionScale.scale
+        });
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Set a say bubble on this clone.
+ * @param {?string} type Type of say bubble: "say", "think", or null.
+ * @param {?string} message Message to put in say bubble.
+ */
+Clone.prototype.setSay = function (type, message) {
+    if (this.isStage) {
+        return;
+    }
+    // @todo: Render to stage.
+    if (!type || !message) {
+        console.log('Clearing say bubble');
+        return;
+    }
+    console.log('Setting say bubble:', type, message);
+};
+
+/**
+ * Set visibility of the clone; i.e., whether it's shown or hidden.
+ * @param {!boolean} visible True if the sprite should be shown.
+ */
+Clone.prototype.setVisible = function (visible) {
+    if (this.isStage) {
+        return;
+    }
+    this.visible = visible;
+    if (this.renderer) {
+        this.renderer.updateDrawableProperties(this.drawableID, {
+            visible: this.visible
+        });
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Set size of the clone, as a percentage of the costume size.
+ * @param {!number} size Size of clone, from 5 to 535.
+ */
+Clone.prototype.setSize = function (size) {
+    if (this.isStage) {
+        return;
+    }
+    // Keep size between 5% and 535%.
+    this.size = MathUtil.clamp(size, 5, 535);
+    if (this.renderer) {
+        var renderedDirectionScale = this._getRenderedDirectionAndScale();
+        this.renderer.updateDrawableProperties(this.drawableID, {
+            direction: renderedDirectionScale.direction,
+            scale: renderedDirectionScale.scale
+        });
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Set a particular graphic effect on this clone.
+ * @param {!string} effectName Name of effect (see `Clone.prototype.effects`).
+ * @param {!number} value Numerical magnitude of effect.
+ */
+Clone.prototype.setEffect = function (effectName, value) {
+    if (!this.effects.hasOwnProperty(effectName)) return;
+    this.effects[effectName] = value;
+    if (this.renderer) {
+        var props = {};
+        props[effectName] = this.effects[effectName];
+        this.renderer.updateDrawableProperties(this.drawableID, props);
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Clear all graphic effects on this clone.
+ */
+Clone.prototype.clearEffects = function () {
+    for (var effectName in this.effects) {
+        this.effects[effectName] = 0;
+    }
+    if (this.renderer) {
+        this.renderer.updateDrawableProperties(this.drawableID, this.effects);
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Set the current costume of this clone.
+ * @param {number} index New index of costume.
+ */
+Clone.prototype.setCostume = function (index) {
+    // Keep the costume index within possible values.
+    index = Math.round(index);
+    this.currentCostume = MathUtil.wrapClamp(
+        index, 0, this.sprite.costumes.length - 1
+    );
+    if (this.renderer) {
+        this.renderer.updateDrawableProperties(this.drawableID, {
+            skin: this.sprite.costumes[this.currentCostume].skin
+        });
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Update the rotation style for this clone.
+ * @param {!string} rotationStyle New rotation style.
+ */
+Clone.prototype.setRotationStyle = function (rotationStyle) {
+    if (rotationStyle == Clone.ROTATION_STYLE_NONE) {
+        this.rotationStyle = Clone.ROTATION_STYLE_NONE;
+    } else if (rotationStyle == Clone.ROTATION_STYLE_ALL_AROUND) {
+        this.rotationStyle = Clone.ROTATION_STYLE_ALL_AROUND;
+    } else if (rotationStyle == Clone.ROTATION_STYLE_LEFT_RIGHT) {
+        this.rotationStyle = Clone.ROTATION_STYLE_LEFT_RIGHT;
+    }
+    if (this.renderer) {
+        var renderedDirectionScale = this._getRenderedDirectionAndScale();
+        this.renderer.updateDrawableProperties(this.drawableID, {
+            direction: renderedDirectionScale.direction,
+            scale: renderedDirectionScale.scale
+        });
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Get a costume index of this clone, by name of the costume.
+ * @param {?string} costumeName Name of a costume.
+ * @return {number} Index of the named costume, or -1 if not present.
+ */
+Clone.prototype.getCostumeIndexByName = function (costumeName) {
+    for (var i = 0; i < this.sprite.costumes.length; i++) {
+        if (this.sprite.costumes[i].name == costumeName) {
+            return i;
+        }
+    }
+    return -1;
+};
+
+/**
+ * Update all drawable properties for this clone.
+ * Use when a batch has changed, e.g., when the drawable is first created.
+ */
+Clone.prototype.updateAllDrawableProperties = function () {
+    if (this.renderer) {
+        var renderedDirectionScale = this._getRenderedDirectionAndScale();
+        this.renderer.updateDrawableProperties(this.drawableID, {
+            position: [this.x, this.y],
+            direction: renderedDirectionScale.direction,
+            scale: renderedDirectionScale.scale,
+            visible: this.visible,
+            skin: this.sprite.costumes[this.currentCostume].skin
+        });
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+/**
+ * Return the human-readable name for this clone, i.e., the sprite's name.
+ * @override
+ * @returns {string} Human-readable name for the clone.
+ */
+Clone.prototype.getName = function () {
+    return this.sprite.name;
+};
+
+/**
+ * Return the clone's tight bounding box.
+ * Includes top, left, bottom, right attributes in Scratch coordinates.
+ * @return {?Object} Tight bounding box of clone, or null.
+ */
+Clone.prototype.getBounds = function () {
+    if (this.renderer) {
+        return this.runtime.renderer.getBounds(this.drawableID);
+    }
+    return null;
+};
+
+/**
+ * Return whether the clone is touching a point.
+ * @param {number} x X coordinate of test point.
+ * @param {number} y Y coordinate of test point.
+ * @return {Boolean} True iff the clone is touching the point.
+ */
+Clone.prototype.isTouchingPoint = function (x, y) {
+    if (this.renderer) {
+        // @todo: Update once pick is in Scratch coordinates.
+        // Limits test to this Drawable, so this will return true
+        // even if the clone is obscured by another Drawable.
+        var pickResult = this.runtime.renderer.pick(
+            x + this.runtime.constructor.STAGE_WIDTH / 2,
+            -y + this.runtime.constructor.STAGE_HEIGHT / 2,
+            null, null,
+            [this.drawableID]
+        );
+        return pickResult === this.drawableID;
+    }
+    return false;
+};
+
+/**
+ * Return whether the clone is touching a stage edge.
+ * @return {Boolean} True iff the clone is touching the stage edge.
+ */
+Clone.prototype.isTouchingEdge = function () {
+    if (this.renderer) {
+        var stageWidth = this.runtime.constructor.STAGE_WIDTH;
+        var stageHeight = this.runtime.constructor.STAGE_HEIGHT;
+        var bounds = this.getBounds();
+        if (bounds.left < -stageWidth / 2 ||
+            bounds.right > stageWidth / 2 ||
+            bounds.top > stageHeight / 2 ||
+            bounds.bottom < -stageHeight / 2) {
+            return true;
+        }
+    }
+    return false;
+};
+
+/**
+ * Return whether the clone is touching a named sprite.
+ * @param {string} spriteName Name fo the sprite.
+ * @return {Boolean} True iff the clone is touching a clone of the sprite.
+ */
+Clone.prototype.isTouchingSprite = function (spriteName) {
+    var firstClone = this.runtime.getSpriteTargetByName(spriteName);
+    if (!firstClone || !this.renderer) {
+        return false;
+    }
+    var drawableCandidates = firstClone.sprite.clones.map(function(clone) {
+        return clone.drawableID;
+    });
+    return this.renderer.isTouchingDrawables(
+        this.drawableID, drawableCandidates);
+};
+
+/**
+ * Return whether the clone is touching a color.
+ * @param {Array.<number>} rgb [r,g,b], values between 0-255.
+ * @return {Promise.<Boolean>} True iff the clone is touching the color.
+ */
+Clone.prototype.isTouchingColor = function (rgb) {
+    if (this.renderer) {
+        return this.renderer.isTouchingColor(this.drawableID, rgb);
+    }
+    return false;
+};
+
+/**
+ * Return whether the clone's color is touching a color.
+ * @param {Object} targetRgb {Array.<number>} [r,g,b], values between 0-255.
+ * @param {Object} maskRgb {Array.<number>} [r,g,b], values between 0-255.
+ * @return {Promise.<Boolean>} True iff the clone's color is touching the color.
+ */
+Clone.prototype.colorIsTouchingColor = function (targetRgb, maskRgb) {
+    if (this.renderer) {
+        return this.renderer.isTouchingColor(
+            this.drawableID,
+            targetRgb,
+            maskRgb
+        );
+    }
+    return false;
+};
+
+/**
+ * Move clone to the front layer.
+ */
+Clone.prototype.goToFront = function () {
+    if (this.renderer) {
+        this.renderer.setDrawableOrder(this.drawableID, Infinity);
+    }
+};
+
+/**
+ * Move clone back a number of layers.
+ * @param {number} nLayers How many layers to go back.
+ */
+Clone.prototype.goBackLayers = function (nLayers) {
+    if (this.renderer) {
+        this.renderer.setDrawableOrder(this.drawableID, -nLayers, true, 1);
+    }
+};
+
+/**
+ * Keep a desired position within a fence.
+ * @param {number} newX New desired X position.
+ * @param {number} newY New desired Y position.
+ * @param {Object=} opt_fence Optional fence with left, right, top bottom.
+ * @return {Array.<number>} Fenced X and Y coordinates.
+ */
+Clone.prototype.keepInFence = function (newX, newY, opt_fence) {
+    var fence = opt_fence;
+    if (!fence) {
+        fence = {
+            left: -this.runtime.constructor.STAGE_WIDTH / 2,
+            right: this.runtime.constructor.STAGE_WIDTH / 2,
+            top: this.runtime.constructor.STAGE_HEIGHT / 2,
+            bottom: -this.runtime.constructor.STAGE_HEIGHT / 2
+        };
+    }
+    var bounds = this.getBounds();
+    if (!bounds) return;
+    // Adjust the known bounds to the target position.
+    bounds.left += (newX - this.x);
+    bounds.right += (newX - this.x);
+    bounds.top += (newY - this.y);
+    bounds.bottom += (newY - this.y);
+    // Find how far we need to move the target position.
+    var dx = 0;
+    var dy = 0;
+    if (bounds.left < fence.left) {
+        dx += fence.left - bounds.left;
+    }
+    if (bounds.right > fence.right) {
+        dx += fence.right - bounds.right;
+    }
+    if (bounds.top > fence.top) {
+        dy += fence.top - bounds.top;
+    }
+    if (bounds.bottom < fence.bottom) {
+        dy += fence.bottom - bounds.bottom;
+    }
+    return [newX + dx, newY + dy];
+};
+
+/**
+ * Make a clone of this clone, copying any run-time properties.
+ * If we've hit the global clone limit, returns null.
+ * @return {!Clone} New clone object.
+ */
+Clone.prototype.makeClone = function () {
+    if (!this.runtime.clonesAvailable()) {
+        return; // Hit max clone limit.
+    }
+    this.runtime.changeCloneCounter(1);
+    var newClone = this.sprite.createClone();
+    newClone.x = this.x;
+    newClone.y = this.y;
+    newClone.direction = this.direction;
+    newClone.visible = this.visible;
+    newClone.size = this.size;
+    newClone.currentCostume = this.currentCostume;
+    newClone.rotationStyle = this.rotationStyle;
+    newClone.effects = JSON.parse(JSON.stringify(this.effects));
+    newClone.variables = JSON.parse(JSON.stringify(this.variables));
+    newClone.lists = JSON.parse(JSON.stringify(this.lists));
+    newClone.initDrawable();
+    newClone.updateAllDrawableProperties();
+    return newClone;
+};
+
+/**
+ * Called when the project receives a "green flag."
+ * For a clone, this clears graphic effects.
+ */
+Clone.prototype.onGreenFlag = function () {
+    this.clearEffects();
+};
+
+/**
+ * Dispose of this clone, destroying any run-time properties.
+ */
+Clone.prototype.dispose = function () {
+    this.runtime.changeCloneCounter(-1);
+    if (this.renderer && this.drawableID !== null) {
+        this.renderer.destroyDrawable(this.drawableID);
+        if (this.visible) {
+            this.runtime.requestRedraw();
+        }
+    }
+};
+
+module.exports = Clone;
diff --git a/src/sprites/sprite.js b/src/sprites/sprite.js
new file mode 100644
index 000000000..2afb25e5e
--- /dev/null
+++ b/src/sprites/sprite.js
@@ -0,0 +1,57 @@
+var Clone = require('./clone');
+var Blocks = require('../engine/blocks');
+
+/**
+ * Sprite to be used on the Scratch stage.
+ * All clones of a sprite have shared blocks, shared costumes, shared variables.
+ * @param {?Blocks} blocks Shared blocks object for all clones of sprite.
+ * @param {Runtime} runtime Reference to the runtime.
+ * @constructor
+ */
+function Sprite (blocks, runtime) {
+    this.runtime = runtime;
+    if (!blocks) {
+        // Shared set of blocks for all clones.
+        blocks = new Blocks();
+    }
+    this.blocks = blocks;
+    /**
+     * Human-readable name for this sprite (and all clones).
+     * @type {string}
+     */
+    this.name = '';
+    /**
+     * List of costumes for this sprite.
+     * Each entry is an object, e.g.,
+     * {
+     *      skin: "costume.svg",
+     *      name: "Costume Name",
+     *      bitmapResolution: 2,
+     *      rotationCenterX: 0,
+     *      rotationCenterY: 0
+     * }
+     * @type {Array.<!Object>}
+     */
+    this.costumes = [];
+    /**
+     * List of clones for this sprite, including the original.
+     * @type {Array.<!Clone>}
+     */
+    this.clones = [];
+}
+
+/**
+ * Create a clone of this sprite.
+ * @returns {!Clone} Newly created clone.
+ */
+Sprite.prototype.createClone = function () {
+    var newClone = new Clone(this, this.runtime);
+    newClone.isOriginal = this.clones.length == 0;
+    this.clones.push(newClone);
+    if (newClone.isOriginal) {
+        newClone.initDrawable();
+    }
+    return newClone;
+};
+
+module.exports = Sprite;
diff --git a/src/util/cast.js b/src/util/cast.js
new file mode 100644
index 000000000..dda55bf8e
--- /dev/null
+++ b/src/util/cast.js
@@ -0,0 +1,163 @@
+var Color = require('../util/color');
+
+function Cast () {}
+
+/**
+ * @fileoverview
+ * Utilities for casting and comparing Scratch data-types.
+ * Scratch behaves slightly differently from JavaScript in many respects,
+ * and these differences should be encapsulated below.
+ * For example, in Scratch, add(1, join("hello", world")) -> 1.
+ * This is because "hello world" is cast to 0.
+ * In JavaScript, 1 + Number("hello" + "world") would give you NaN.
+ * Use when coercing a value before computation.
+ */
+
+/**
+ * Scratch cast to number.
+ * Treats NaN as 0.
+ * In Scratch 2.0, this is captured by `interp.numArg.`
+ * @param {*} value Value to cast to number.
+ * @return {number} The Scratch-casted number value.
+ */
+Cast.toNumber = function (value) {
+    var n = Number(value);
+    if (isNaN(n)) {
+        // Scratch treats NaN as 0, when needed as a number.
+        // E.g., 0 + NaN -> 0.
+        return 0;
+    }
+    return n;
+};
+
+/**
+ * Scratch cast to boolean.
+ * In Scratch 2.0, this is captured by `interp.boolArg.`
+ * Treats some string values differently from JavaScript.
+ * @param {*} value Value to cast to boolean.
+ * @return {boolean} The Scratch-casted boolean value.
+ */
+Cast.toBoolean = function (value) {
+    // Already a boolean?
+    if (typeof value === 'boolean') {
+        return value;
+    }
+    if (typeof value === 'string') {
+        // These specific strings are treated as false in Scratch.
+        if ((value == '') ||
+            (value == '0') ||
+            (value.toLowerCase() == 'false')) {
+            return false;
+        }
+        // All other strings treated as true.
+        return true;
+    }
+    // Coerce other values and numbers.
+    return Boolean(value);
+};
+
+/**
+ * Scratch cast to string.
+ * @param {*} value Value to cast to string.
+ * @return {string} The Scratch-casted string value.
+ */
+Cast.toString = function (value) {
+    return String(value);
+};
+
+/**
+ * Cast any Scratch argument to an RGB color object to be used for the renderer.
+ * @param {*} value Value to convert to RGB color object.
+ * @return {Array.<number>} [r,g,b], values between 0-255.
+ */
+Cast.toRgbColorList = function (value) {
+    var color;
+    if (typeof value == 'string' && value.substring(0, 1) == '#') {
+        color = Color.hexToRgb(value);
+    } else {
+        color = Color.decimalToRgb(Cast.toNumber(value));
+    }
+    return [color.r, color.g, color.b];
+};
+
+/**
+ * Compare two values, using Scratch cast, case-insensitive string compare, etc.
+ * In Scratch 2.0, this is captured by `interp.compare.`
+ * @param {*} v1 First value to compare.
+ * @param {*} v2 Second value to compare.
+ * @returns {Number} Negative number if v1 < v2; 0 if equal; positive otherwise.
+ */
+Cast.compare = function (v1, v2) {
+    var n1 = Number(v1);
+    var n2 = Number(v2);
+    if (isNaN(n1) || isNaN(n2)) {
+        // At least one argument can't be converted to a number.
+        // Scratch compares strings as case insensitive.
+        var s1 = String(v1).toLowerCase();
+        var s2 = String(v2).toLowerCase();
+        return s1.localeCompare(s2);
+    } else {
+        // Compare as numbers.
+        return n1 - n2;
+    }
+};
+
+/**
+ * Determine if a Scratch argument number represents a round integer.
+ * @param {*} val Value to check.
+ * @return {boolean} True if number looks like an integer.
+ */
+Cast.isInt = function (val) {
+    // Values that are already numbers.
+    if (typeof val === 'number') {
+        if (isNaN(val)) { // NaN is considered an integer.
+            return true;
+        }
+        // True if it's "round" (e.g., 2.0 and 2).
+        return val == parseInt(val);
+    } else if (typeof val === 'boolean') {
+        // `True` and `false` always represent integer after Scratch cast.
+        return true;
+    } else if (typeof val === 'string') {
+        // If it contains a decimal point, don't consider it an int.
+        return val.indexOf('.') < 0;
+    }
+    return false;
+};
+
+Cast.LIST_INVALID = 'INVALID';
+Cast.LIST_ALL = 'ALL';
+/**
+ * Compute a 1-based index into a list, based on a Scratch argument.
+ * Two special cases may be returned:
+ * LIST_ALL: if the block is referring to all of the items in the list.
+ * LIST_INVALID: if the index was invalid in any way.
+ * @param {*} index Scratch arg, including 1-based numbers or special cases.
+ * @param {number} length Length of the list.
+ * @return {(number|string)} 1-based index for list, LIST_ALL, or LIST_INVALID.
+ */
+Cast.toListIndex = function (index, length) {
+    if (typeof index !== 'number') {
+        if (index == 'all') {
+            return Cast.LIST_ALL;
+        }
+        if (index == 'last') {
+            if (length > 0) {
+                return length;
+            }
+            return Cast.LIST_INVALID;
+        } else if (index == 'random' || index == 'any') {
+            if (length > 0) {
+                return 1 + Math.floor(Math.random() * length);
+            }
+            return Cast.LIST_INVALID;
+        }
+    }
+    index = Math.floor(Cast.toNumber(index));
+    if (index < 1 || index > length) {
+        return Cast.LIST_INVALID;
+    }
+    return index;
+};
+
+module.exports = Cast;
diff --git a/src/util/color.js b/src/util/color.js
new file mode 100644
index 000000000..2635c1b6c
--- /dev/null
+++ b/src/util/color.js
@@ -0,0 +1,76 @@
+function Color () {}
+
+/**
+ * Convert a Scratch decimal color to a hex string, #RRGGBB.
+ * @param {number} decimal RGB color as a decimal.
+ * @return {string} RGB color as #RRGGBB hex string.
+ */
+Color.decimalToHex = function (decimal) {
+    if (decimal < 0) {
+        decimal += 0xFFFFFF + 1;
+    }
+    var hex = Number(decimal).toString(16);
+    hex = '#' + '000000'.substr(0, 6 - hex.length) + hex;
+    return hex;
+};
+
+/**
+ * Convert a Scratch decimal color to an RGB color object.
+ * @param {number} decimal RGB color as decimal.
+ * @returns {Object} {r: R, g: G, b: B}, values between 0-255
+ */
+Color.decimalToRgb = function (decimal) {
+    var r = (decimal >> 16) & 0xFF;
+    var g = (decimal >> 8) & 0xFF;
+    var b = decimal & 0xFF;
+    return {r: r, g: g, b: b};
+};
+
+/**
+ * Convert a hex color (e.g., F00, #03F, #0033FF) to an RGB color object.
+ * CC-BY-SA Tim Down:
+ * https://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
+ * @param {!string} hex Hex representation of the color.
+ * @return {Object} {r: R, g: G, b: B}, 0-255, or null.
+ */
+Color.hexToRgb = function (hex) {
+    var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
+    hex = hex.replace(shorthandRegex, function(m, r, g, b) {
+        return r + r + g + g + b + b;
+    });
+    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+    return result ? {
+        r: parseInt(result[1], 16),
+        g: parseInt(result[2], 16),
+        b: parseInt(result[3], 16)
+    } : null;
+};
+
+/**
+ * Convert an RGB color object to a hex color.
+ * @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
+ * @return {!string} Hex representation of the color.
+ */
+Color.rgbToHex = function (rgb) {
+    return Color.decimalToHex(Color.rgbToDecimal(rgb));
+};
+
+/**
+ * Convert an RGB color object to a Scratch decimal color.
+ * @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
+ * @return {!number} Number representing the color.
+ */
+Color.rgbToDecimal = function (rgb) {
+    return (rgb.r << 16) + (rgb.g << 8) + rgb.b;
+};
+
+/**
+* Convert a hex color (e.g., F00, #03F, #0033FF) to a decimal color number.
+* @param {!string} hex Hex representation of the color.
+* @return {!number} Number representing the color.
+*/
+Color.hexToDecimal = function (hex) {
+    return Color.rgbToDecimal(Color.hexToRgb(hex));
+};
+
+module.exports = Color;
diff --git a/src/util/math-util.js b/src/util/math-util.js
new file mode 100644
index 000000000..14ebb450e
--- /dev/null
+++ b/src/util/math-util.js
@@ -0,0 +1,48 @@
+function MathUtil () {}
+
+/**
+ * Convert a value from degrees to radians.
+ * @param {!number} deg Value in degrees.
+ * @return {!number} Equivalent value in radians.
+ */
+MathUtil.degToRad = function (deg) {
+    return deg * Math.PI / 180;
+};
+
+/**
+ * Convert a value from radians to degrees.
+ * @param {!number} rad Value in radians.
+ * @return {!number} Equivalent value in degrees.
+ */
+MathUtil.radToDeg = function (rad) {
+    return rad * 180 / Math.PI;
+};
+
+/**
+ * Clamp a number between two limits.
+ * If n < min, return min. If n > max, return max. Else, return n.
+ * @param {!number} n Number to clamp.
+ * @param {!number} min Minimum limit.
+ * @param {!number} max Maximum limit.
+ * @return {!number} Value of n clamped to min and max.
+ */
+MathUtil.clamp = function (n, min, max) {
+    return Math.min(Math.max(n, min), max);
+};
+
+/**
+ * Keep a number between two limits, wrapping "extra" into the range.
+ * e.g., wrapClamp(7, 1, 5) == 2
+ * wrapClamp(0, 1, 5) == 5
+ * wrapClamp(-11, -10, 6) == 6, etc.
+ * @param {!number} n Number to wrap.
+ * @param {!number} min Minimum limit.
+ * @param {!number} max Maximum limit.
+ * @return {!number} Value of n wrapped between min and max.
+ */
+MathUtil.wrapClamp = function (n, min, max) {
+    var range = (max - min) + 1;
+    return n - Math.floor((n - min) / range) * range;
+};
+
+module.exports = MathUtil;
diff --git a/src/util/timer.js b/src/util/timer.js
index 10a5b3241..48dd223d5 100644
--- a/src/util/timer.js
+++ b/src/util/timer.js
@@ -1,20 +1,70 @@
 /**
- * Constructor
+ * @fileoverview
+ * A utility for accurately measuring time.
+ * To use:
+ * ---
+ * var timer = new Timer();
+ * timer.start();
+ * ... pass some time ...
+ * var timeDifference = timer.timeElapsed();
+ * ---
+ * Or, you can use the `time` and `relativeTime`
+ * to do some measurement yourself.
  */
-function Timer () {
-    this.startTime = 0;
-}
 
+/**
+ * @constructor
+ */
+function Timer () {}
+
+/**
+ * Used to store the start time of a timer action.
+ * Updated when calling `timer.start`.
+ */
+Timer.prototype.startTime = 0;
+
+/**
+ * Return the currently known absolute time, in ms precision.
+ * @returns {number} ms elapsed since 1 January 1970 00:00:00 UTC.
+ */
 Timer.prototype.time = function () {
-    return Date.now();
+    if (Date.now) {
+        return Date.now();
+    } else {
+        return new Date().getTime();
+    }
 };
 
+/**
+ * Returns a time accurate relative to other times produced by this function.
+ * If possible, will use sub-millisecond precision.
+ * If not, will use millisecond precision.
+ * Not guaranteed to produce the same absolute values per-system.
+ * @returns {number} ms-scale accurate time relative to other relative times.
+ */
+Timer.prototype.relativeTime = function () {
+    if (typeof self !== 'undefined' &&
+        self.performance && 'now' in self.performance) {
+        return self.performance.now();
+    } else {
+        return this.time();
+    }
+};
+
+/**
+ * Start a timer for measuring elapsed time,
+ * at the most accurate precision possible.
+ */
 Timer.prototype.start = function () {
-    this.startTime = this.time();
+    this.startTime = this.relativeTime();
 };
 
+/**
+ * Check time elapsed since `timer.start` was called.
+ * @returns {number} Time elapsed, in ms (possibly sub-ms precision).
+ */
 Timer.prototype.timeElapsed = function () {
-    return this.time() - this.startTime;
+    return this.relativeTime() - this.startTime;
 };
 
 module.exports = Timer;
diff --git a/src/util/uid.js b/src/util/uid.js
new file mode 100644
index 000000000..532f9e9bf
--- /dev/null
+++ b/src/util/uid.js
@@ -0,0 +1,29 @@
+/**
+ * @fileoverview UID generator, from Blockly.
+ */
+
+/**
+ * Legal characters for the unique ID.
+ * Should be all on a US keyboard.  No XML special characters or control codes.
+ * Removed $ due to issue 251.
+ * @private
+ */
+var soup_ = '!#%()*+,-./:;=?@[]^_`{|}~' +
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+
+/**
+ * Generate a unique ID, from Blockly.  This should be globally unique.
+ * 87 characters ^ 20 length > 128 bits (better than a UUID).
+ * @return {string} A globally unique ID string.
+ */
+var uid = function () {
+    var length = 20;
+    var soupLength = soup_.length;
+    var id = [];
+    for (var i = 0; i < length; i++) {
+        id[i] = soup_.charAt(Math.random() * soupLength);
+    }
+    return id.join('');
+};
+
+module.exports = uid;
diff --git a/src/util/xml-escape.js b/src/util/xml-escape.js
new file mode 100644
index 000000000..00ce5bff6
--- /dev/null
+++ b/src/util/xml-escape.js
@@ -0,0 +1,21 @@
+/**
+ * Escape a string to be safe to use in XML content.
+ * CC-BY-SA: hgoebl
+ * https://stackoverflow.com/questions/7918868/
+ * how-to-escape-xml-entities-in-javascript
+ * @param {!string} unsafe Unsafe string.
+ * @return {string} XML-escaped string, for use within an XML tag.
+ */
+var xmlEscape = function (unsafe) {
+    return unsafe.replace(/[<>&'"]/g, function (c) {
+        switch (c) {
+        case '<': return '&lt;';
+        case '>': return '&gt;';
+        case '&': return '&amp;';
+        case '\'': return '&apos;';
+        case '"': return '&quot;';
+        }
+    });
+};
+
+module.exports = xmlEscape;
diff --git a/src/util/yieldtimers.js b/src/util/yieldtimers.js
deleted file mode 100644
index 45e244eaf..000000000
--- a/src/util/yieldtimers.js
+++ /dev/null
@@ -1,90 +0,0 @@
-/**
- * @fileoverview Timers that are synchronized with the Scratch sequencer.
- */
-var Timer = require('./timer');
-
-function YieldTimers () {}
-
-/**
- * Shared collection of timers.
- * Each timer is a [Function, number] with the callback
- * and absolute time for it to run.
- * @type {Object.<number,Array>}
- */
-YieldTimers.timers = {};
-
-/**
- * Monotonically increasing timer ID.
- * @type {number}
- */
-YieldTimers.timerId = 0;
-
-/**
- * Utility for measuring time.
- * @type {!Timer}
- */
-YieldTimers.globalTimer = new Timer();
-
-/**
- * The timeout function is passed to primitives and is intended
- * as a convenient replacement for window.setTimeout.
- * The sequencer will attempt to resolve the timer every time
- * the yielded thread would have been stepped.
- * @param {!Function} callback To be called when the timer is done.
- * @param {number} timeDelta Time to wait, in ms.
- * @return {number} Timer ID to be used with other methods.
- */
-YieldTimers.timeout = function (callback, timeDelta) {
-    var id = ++YieldTimers.timerId;
-    YieldTimers.timers[id] = [
-        callback,
-        YieldTimers.globalTimer.time() + timeDelta
-    ];
-    return id;
-};
-
-/**
- * Attempt to resolve a timeout.
- * If the time has passed, call the callback.
- * Otherwise, do nothing.
- * @param {number} id Timer ID to resolve.
- * @return {boolean} True if the timer has resolved.
- */
-YieldTimers.resolve = function (id) {
-    var timer = YieldTimers.timers[id];
-    if (!timer) {
-        // No such timer.
-        return false;
-    }
-    var callback = timer[0];
-    var time = timer[1];
-    if (YieldTimers.globalTimer.time() < time) {
-        // Not done yet.
-        return false;
-    }
-    // Execute the callback and remove the timer.
-    callback();
-    delete YieldTimers.timers[id];
-    return true;
-};
-
-/**
- * Reject a timer so the callback never executes.
- * @param {number} id Timer ID to reject.
- */
-YieldTimers.reject = function (id) {
-    if (YieldTimers.timers[id]) {
-        delete YieldTimers.timers[id];
-    }
-};
-
-/**
- * Reject all timers currently stored.
- * Especially useful for a Scratch "stop."
- */
-YieldTimers.rejectAll = function () {
-    YieldTimers.timers = {};
-    YieldTimers.timerId = 0;
-};
-
-module.exports = YieldTimers;
diff --git a/test/fixtures/default.json b/test/fixtures/default.json
new file mode 100644
index 000000000..af478a4e2
--- /dev/null
+++ b/test/fixtures/default.json
@@ -0,0 +1,71 @@
+{
+   "objName": "Stage",
+   "sounds": [{
+           "soundName": "pop",
+           "soundID": -1,
+           "md5": "83a9787d4cb6f3b7632b4ddfebf74367.wav",
+           "sampleCount": 258,
+           "rate": 11025,
+           "format": ""
+       }],
+   "costumes": [{
+           "costumeName": "backdrop1",
+           "baseLayerID": -1,
+           "baseLayerMD5": "739b5e2a2435f6e1ec2993791b423146.png",
+           "bitmapResolution": 1,
+           "rotationCenterX": 240,
+           "rotationCenterY": 180
+       }],
+   "currentCostumeIndex": 0,
+   "penLayerMD5": "5c81a336fab8be57adc039a8a2b33ca9.png",
+   "penLayerID": -1,
+   "tempoBPM": 60,
+   "videoAlpha": 0.5,
+   "children": [{
+           "objName": "Sprite1",
+           "sounds": [{
+                   "soundName": "meow",
+                   "soundID": -1,
+                   "md5": "83c36d806dc92327b9e7049a565c6bff.wav",
+                   "sampleCount": 18688,
+                   "rate": 22050,
+                   "format": ""
+               }],
+           "costumes": [{
+                   "costumeName": "costume1",
+                   "baseLayerID": -1,
+                   "baseLayerMD5": "09dc888b0b7df19f70d81588ae73420e.svg",
+                   "bitmapResolution": 1,
+                   "rotationCenterX": 47,
+                   "rotationCenterY": 55
+               },
+               {
+                   "costumeName": "costume2",
+                   "baseLayerID": -1,
+                   "baseLayerMD5": "3696356a03a8d938318876a593572843.svg",
+                   "bitmapResolution": 1,
+                   "rotationCenterX": 47,
+                   "rotationCenterY": 55
+               }],
+           "currentCostumeIndex": 0,
+           "scratchX": 0,
+           "scratchY": 0,
+           "scale": 1,
+           "direction": 90,
+           "rotationStyle": "normal",
+           "isDraggable": false,
+           "indexInLibrary": 1,
+           "visible": true,
+           "spriteInfo": {
+           }
+       }],
+   "info": {
+       "videoOn": false,
+       "userAgent": "Mozilla\/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/50.0.2661.102 Safari\/537.36",
+       "swfVersion": "v446",
+       "scriptCount": 0,
+       "spriteCount": 1,
+       "hasCloudData": false,
+       "flashVersion": "MAC 21,0,0,242"
+   }
+}
diff --git a/test/fixtures/demo.json b/test/fixtures/demo.json
new file mode 100644
index 000000000..b10376ec7
--- /dev/null
+++ b/test/fixtures/demo.json
@@ -0,0 +1,359 @@
+{
+	"objName": "Stage",
+	"variables": [{
+			"name": "x",
+			"value": "1",
+			"isPersistent": false
+		},
+		{
+			"name": "y",
+			"value": "1",
+			"isPersistent": false
+		},
+		{
+			"name": "z",
+			"value": "1",
+			"isPersistent": false
+		},
+		{
+			"name": "d",
+			"value": "1",
+			"isPersistent": false
+		},
+		{
+			"name": "a",
+			"value": 4,
+			"isPersistent": false
+		}],
+	"lists": [{
+			"listName": "D# Minor Pentatonic",
+			"contents": ["78",
+				"75",
+				"73",
+				"75",
+				"70",
+				"78",
+				"73",
+				"75",
+				"75",
+				"78",
+				"75",
+				"73",
+				"75",
+				"70",
+				"75",
+				"78",
+				"73",
+				"75",
+				"78",
+				"75",
+				"73",
+				"75",
+				"70",
+				"73",
+				"68",
+				"70",
+				"66",
+				"68",
+				"63"],
+			"isPersistent": false,
+			"x": 5,
+			"y": 32,
+			"width": 125,
+			"height": 206,
+			"visible": true
+		}],
+	"scripts": [[52,
+			8,
+			[["whenIReceive", "start"],
+				["setVar:to:", "a", "1"],
+				["doRepeat",
+					["lineCountOfList:", "D# Minor Pentatonic"],
+					[["noteOn:duration:elapsed:from:", ["getLine:ofList:", ["readVariable", "a"], "D# Minor Pentatonic"], 0.5], ["changeVar:by:", "a", 1]]]]],
+		[53,
+			186,
+			[["whenIReceive", "start"],
+				["setVar:to:", "x", "1"],
+				["rest:elapsed:from:", 7.25],
+				["doRepeat",
+					["lineCountOfList:", "D# Minor Pentatonic"],
+					[["noteOn:duration:elapsed:from:", ["getLine:ofList:", ["readVariable", "x"], "D# Minor Pentatonic"], 0.25], ["changeVar:by:", "x", 1]]]]],
+		[48,
+			557,
+			[["whenIReceive", "start"],
+				["setVar:to:", "z", "1"],
+				["rest:elapsed:from:", 13],
+				["doRepeat",
+					["lineCountOfList:", "D# Minor Pentatonic"],
+					[["noteOn:duration:elapsed:from:", ["getLine:ofList:", ["readVariable", "z"], "D# Minor Pentatonic"], 0.0625], ["changeVar:by:", "z", 1]]]]],
+		[49,
+			368,
+			[["whenIReceive", "start"],
+				["setVar:to:", "y", "1"],
+				["rest:elapsed:from:", 11],
+				["doRepeat",
+					["lineCountOfList:", "D# Minor Pentatonic"],
+					[["noteOn:duration:elapsed:from:", ["getLine:ofList:", ["readVariable", "y"], "D# Minor Pentatonic"], 0.125], ["changeVar:by:", "y", 1]]]]],
+		[52,
+			745,
+			[["whenIReceive", "start"],
+				["setVar:to:", "d", "1"],
+				["rest:elapsed:from:", 13.5],
+				["doRepeat",
+					["lineCountOfList:", "D# Minor Pentatonic"],
+					[["noteOn:duration:elapsed:from:", ["getLine:ofList:", ["readVariable", "d"], "D# Minor Pentatonic"], 0.03125], ["changeVar:by:", "d", 1]]]]]],
+	"sounds": [{
+			"soundName": "pop",
+			"soundID": 0,
+			"md5": "83a9787d4cb6f3b7632b4ddfebf74367.wav",
+			"sampleCount": 258,
+			"rate": 11025,
+			"format": ""
+		}],
+	"costumes": [{
+			"costumeName": "backdrop1",
+			"baseLayerID": 4,
+			"baseLayerMD5": "b61b1077b0ea1931abee9dbbfa7903ff.png",
+			"bitmapResolution": 2,
+			"rotationCenterX": 480,
+			"rotationCenterY": 360
+		}],
+	"currentCostumeIndex": 0,
+	"penLayerMD5": "5c81a336fab8be57adc039a8a2b33ca9.png",
+	"penLayerID": 0,
+	"tempoBPM": 60,
+	"videoAlpha": 0.5,
+	"children": [{
+			"objName": "Indicator",
+			"scripts": [[247.85,
+					32.8,
+					[["procDef", "foo %n", ["bar"], [1], false],
+						["hide"],
+						["clearPenTrails"],
+						["penColor:", 5968094],
+						["say:", ["getParam", "bar", "r"]],
+						["stopScripts", "this script"]]],
+				[41, 36, [["whenGreenFlag"], ["call", "foo %n", 1]]]],
+			"sounds": [{
+					"soundName": "pop",
+					"soundID": 0,
+					"md5": "83a9787d4cb6f3b7632b4ddfebf74367.wav",
+					"sampleCount": 258,
+					"rate": 11025,
+					"format": ""
+				}],
+			"costumes": [{
+					"costumeName": "costume1",
+					"baseLayerID": 1,
+					"baseLayerMD5": "d36f6603ec293d2c2198d3ea05109fe0.png",
+					"bitmapResolution": 2,
+					"rotationCenterX": 0,
+					"rotationCenterY": 0
+				}],
+			"currentCostumeIndex": 0,
+			"scratchX": 22,
+			"scratchY": -26,
+			"scale": 1,
+			"direction": 90,
+			"rotationStyle": "normal",
+			"isDraggable": false,
+			"indexInLibrary": 3,
+			"visible": false,
+			"spriteInfo": {
+			}
+		},
+		{
+			"target": "Stage",
+			"cmd": "timer",
+			"param": null,
+			"color": 2926050,
+			"label": "timer",
+			"mode": 1,
+			"sliderMin": 0,
+			"sliderMax": 100,
+			"isDiscrete": true,
+			"x": 5,
+			"y": 5,
+			"visible": false
+		},
+		{
+			"target": "Stage",
+			"cmd": "getVar:",
+			"param": "x",
+			"color": 15629590,
+			"label": "x",
+			"mode": 1,
+			"sliderMin": 0,
+			"sliderMax": 100,
+			"isDiscrete": true,
+			"x": 5,
+			"y": 268,
+			"visible": true
+		},
+		{
+			"target": "Stage",
+			"cmd": "getVar:",
+			"param": "y",
+			"color": 15629590,
+			"label": "y",
+			"mode": 1,
+			"sliderMin": 0,
+			"sliderMax": 100,
+			"isDiscrete": true,
+			"x": 5,
+			"y": 295,
+			"visible": true
+		},
+		{
+			"target": "Stage",
+			"cmd": "getVar:",
+			"param": "z",
+			"color": 15629590,
+			"label": "z",
+			"mode": 1,
+			"sliderMin": 0,
+			"sliderMax": 100,
+			"isDiscrete": true,
+			"x": 78,
+			"y": 268,
+			"visible": true
+		},
+		{
+			"objName": "Play",
+			"scripts": [[32, 33, [["whenClicked"], ["broadcast:", "start"]]]],
+			"sounds": [{
+					"soundName": "pop",
+					"soundID": 0,
+					"md5": "83a9787d4cb6f3b7632b4ddfebf74367.wav",
+					"sampleCount": 258,
+					"rate": 11025,
+					"format": ""
+				}],
+			"costumes": [{
+					"costumeName": "costume1",
+					"baseLayerID": 2,
+					"baseLayerMD5": "30f811366ae3a53e6447932cc7f0212d.png",
+					"bitmapResolution": 2,
+					"rotationCenterX": 68,
+					"rotationCenterY": 115
+				}],
+			"currentCostumeIndex": 0,
+			"scratchX": 2,
+			"scratchY": -48,
+			"scale": 1,
+			"direction": 90,
+			"rotationStyle": "normal",
+			"isDraggable": false,
+			"indexInLibrary": 1,
+			"visible": true,
+			"spriteInfo": {
+			}
+		},
+		{
+			"target": "Stage",
+			"cmd": "getVar:",
+			"param": "d",
+			"color": 15629590,
+			"label": "d",
+			"mode": 1,
+			"sliderMin": 0,
+			"sliderMax": 100,
+			"isDiscrete": true,
+			"x": 5,
+			"y": 241,
+			"visible": true
+		},
+		{
+			"target": "Stage",
+			"cmd": "getVar:",
+			"param": "a",
+			"color": 15629590,
+			"label": "a",
+			"mode": 1,
+			"sliderMin": 0,
+			"sliderMax": 100,
+			"isDiscrete": true,
+			"x": 78,
+			"y": 241,
+			"visible": true
+		},
+		{
+			"objName": "Stop",
+			"scripts": [[45, 104, [["whenClicked"], ["stopScripts", "all"]]]],
+			"sounds": [{
+					"soundName": "pop",
+					"soundID": 0,
+					"md5": "83a9787d4cb6f3b7632b4ddfebf74367.wav",
+					"sampleCount": 258,
+					"rate": 11025,
+					"format": ""
+				}],
+			"costumes": [{
+					"costumeName": "costume1",
+					"baseLayerID": 3,
+					"baseLayerMD5": "3de406f265b8d664406adf7c70762514.png",
+					"bitmapResolution": 2,
+					"rotationCenterX": 68,
+					"rotationCenterY": 70
+				}],
+			"currentCostumeIndex": 0,
+			"scratchX": 121,
+			"scratchY": -33,
+			"scale": 1,
+			"direction": 90,
+			"rotationStyle": "normal",
+			"isDraggable": false,
+			"indexInLibrary": 2,
+			"visible": true,
+			"spriteInfo": {
+			}
+		},
+		{
+			"listName": "D# Minor Pentatonic",
+			"contents": ["78",
+				"75",
+				"73",
+				"75",
+				"70",
+				"78",
+				"73",
+				"75",
+				"75",
+				"78",
+				"75",
+				"73",
+				"75",
+				"70",
+				"75",
+				"78",
+				"73",
+				"75",
+				"78",
+				"75",
+				"73",
+				"75",
+				"70",
+				"73",
+				"68",
+				"70",
+				"66",
+				"68",
+				"63"],
+			"isPersistent": false,
+			"x": 5,
+			"y": 32,
+			"width": 125,
+			"height": 206,
+			"visible": true
+		}],
+	"info": {
+		"spriteCount": 3,
+		"projectID": "118381369",
+		"videoOn": false,
+		"hasCloudData": false,
+		"userAgent": "Mozilla\/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/53.0.2785.143 Safari\/537.36",
+		"scriptCount": 9,
+		"flashVersion": "MAC 23,0,0,185",
+		"swfVersion": "v450.1"
+	}
+}
diff --git a/test/fixtures/events.json b/test/fixtures/events.json
index fca8693ff..d91370f6e 100644
--- a/test/fixtures/events.json
+++ b/test/fixtures/events.json
@@ -1,20 +1,69 @@
 {
     "create": {
-        "blockId": "z!+#Nqr,_(V=xz0y7a@d",
         "workspaceId": "7Luws3lyb*Z98~Kk+IG|",
         "group": ";OswyM#@%`%,xOrhOXC=",
         "recordUndo": true,
+        "name": "block",
         "xml": {
-            "attributes": {
-                "type": {
-                    "value": "wedo_motorclockwise"
-                }
-            },
-            "innerHTML": "<value name=\"DURATION\"><shadow type=\"math_number\" id=\"!6Ahqg4f}Ljl}X5Hws?Z\"><field name=\"NUM\">10</field></shadow></value>"
+            "outerHTML": "<block type=\"wedo_motorclockwise\" id=\"z!+#Nqr,_(V=xz0y7a@d\"><value name=\"DURATION\"><shadow type=\"math_number\" id=\"!6Ahqg4f}Ljl}X5Hws?Z\"><field name=\"NUM\">10</field></shadow></value></block>"
         },
         "ids": [
             "z!+#Nqr,_(V=xz0y7a@d",
             "!6Ahqg4f}Ljl}X5Hws?Z"
         ]
+    },
+    "createbranch": {
+        "name": "block",
+        "xml": {
+            "outerHTML": "<block type=\"control_forever\" id=\"r9`RpL74T6*SXPKv7}Dq\" x=\"61\" y=\"90\"><statement name=\"SUBSTACK\"><block type=\"control_wait\" id=\"{Rwt[LFtD1-JPAi-qf:.\"><value name=\"DURATION\"><shadow type=\"math_number\" id=\"VMDxt_9SYe5{*eNRe5dZ\"><field name=\"NUM\">1</field></shadow></value></block></statement></block>"
+        }
+    },
+    "createtwobranches": {
+        "name": "block",
+        "xml": {
+            "outerHTML": "<block type=\"control_if_else\" id=\"8W?lmIY!Tgnh)~0!G#9-\" x=\"87\" y=\"159\"><statement name=\"SUBSTACK\"><block type=\"event_broadcast\" id=\"lgU2GGtwlREuasCB02Vr\"></block></statement><statement name=\"SUBSTACK2\"><block type=\"event_broadcast\" id=\"Gb]N,2P;|J%F?pxSwz(2\"></block></statement></block>"
+        }
+    },
+    "createtoplevelshadow": {
+        "name": "shadow",
+        "xml": {
+            "outerHTML": "<shadow type=\"math_number\" id=\"z9d57=IUI5se;DBbyug)\"><field name=\"NUM\">4</field></shadow>"
+        }
+    },
+    "createwithnext": {
+        "name": "block",
+        "xml": {
+            "outerHTML": "<block type=\"wedo_setcolor\" id=\"*CT)7+UKjQIEtUw.OGT6\" x=\"89\" y=\"48\"><next><block type=\"wedo_motorspeed\" id=\"Er*:^o7yYL#dX+5)R^xq\"></block></next></block>"
+        }
+    },
+    "createinvalid": {
+        "name": "whatever",
+        "xml": {
+            "outerHTML": "<xml></xml>"
+        }
+    },
+    "createinvalidgrandchild": {
+        "name": "block",
+        "xml": {
+            "outerHTML": "<block type=\"control_forever\" id=\"r9`RpL74T6*SXPKv7}Dq\" x=\"61\" y=\"90\"><next><invalidgrandchild>xxx</invalidgrandchild></next></block>"
+        }
+    },
+    "createbadxml": {
+        "name": "whatever",
+        "xml": {
+            "outerHTML": "></xml>"
+        }
+    },
+    "createemptyfield": {
+        "name": "block",
+        "xml": {
+            "outerHTML":  "<block type='operator_equals' id='l^H_{8[DDyDW?m)HIt@b' x='100' y='362'><value name='OPERAND1'><shadow type='text' id='Ud@4y]bc./]uv~te?brb'><field name='TEXT'></field></shadow></value><value name='OPERAND2'><shadow type='text' id='p8[y..,[K;~G,k7]N;08'><field name='TEXT'></field></shadow></value></block>"
+        }
+    },
+    "createobscuredshadow": {
+        "name": "block",
+        "xml": {
+            "outerHTML": "<block type='operator_add' id='D;MqidqmaN}Dft)y#Bf`' x='80' y='98'><value name='NUM1'><shadow type='math_number' id='F[IFAdLbq8!q25+Nio@i'><field name='NUM'></field></shadow><block type='sensing_answer' id='D~ZQ|BYb1)xw4)8ziI%.'></block</value><value name='NUM2'><shadow type='math_number' id='|Sjv4!*X6;wj?QaCE{-9'><field name='NUM'></field></shadow></value></block>"
+        }
     }
 }
diff --git a/test/integration/index.js b/test/integration/index.js
index c98e44651..06bdcf37b 100644
--- a/test/integration/index.js
+++ b/test/integration/index.js
@@ -6,7 +6,6 @@ test('spec', function (t) {
 
     t.type(VirtualMachine, 'function');
     t.type(vm, 'object');
-    t.type(vm.blockListener, 'function');
     t.end();
 });
 
diff --git a/test/unit/adapter.js b/test/unit/adapter.js
deleted file mode 100644
index 547e0b9b0..000000000
--- a/test/unit/adapter.js
+++ /dev/null
@@ -1,20 +0,0 @@
-var test = require('tap').test;
-var adapter = require('../../src/engine/adapter');
-var events = require('../fixtures/events.json');
-
-test('spec', function (t) {
-    t.type(adapter, 'function');
-    t.end();
-});
-
-test('create event', function (t) {
-    var result = adapter(events.create);
-
-    t.type(result, 'object');
-    t.type(result.id, 'string');
-    t.type(result.opcode, 'string');
-    t.type(result.fields, 'object');
-    t.type(result.fields['DURATION'], 'object');
-
-    t.end();
-});
diff --git a/test/unit/blocks_operators.js b/test/unit/blocks_operators.js
new file mode 100644
index 000000000..f7befa063
--- /dev/null
+++ b/test/unit/blocks_operators.js
@@ -0,0 +1,175 @@
+var test = require('tap').test;
+var Operators = require('../../src/blocks/scratch3_operators');
+
+var blocks = new Operators(null);
+
+test('getPrimitives', function (t) {
+    t.type(blocks.getPrimitives(), 'object');
+    t.end();
+});
+
+test('add', function (t) {
+    t.strictEqual(blocks.add({NUM1:'1', NUM2:'1'}), 2);
+    t.strictEqual(blocks.add({NUM1:'foo', NUM2:'bar'}), 0);
+    t.end();
+});
+
+test('subtract', function (t) {
+    t.strictEqual(blocks.subtract({NUM1:'1', NUM2:'1'}), 0);
+    t.strictEqual(blocks.subtract({NUM1:'foo', NUM2:'bar'}), 0);
+    t.end();
+});
+
+test('multiply', function (t) {
+    t.strictEqual(blocks.multiply({NUM1:'2', NUM2:'2'}), 4);
+    t.strictEqual(blocks.multiply({NUM1:'foo', NUM2:'bar'}), 0);
+    t.end();
+});
+
+test('divide', function (t) {
+    t.strictEqual(blocks.divide({NUM1:'2', NUM2:'2'}), 1);
+    t.strictEqual(blocks.divide({NUM1:'1', NUM2:'0'}), Infinity);   // @todo
+    t.ok(isNaN(blocks.divide({NUM1:'foo', NUM2:'bar'})));           // @todo
+    t.end();
+});
+
+test('lt', function (t) {
+    t.strictEqual(blocks.lt({OPERAND1:'1', OPERAND2:'2'}), true);
+    t.strictEqual(blocks.lt({OPERAND1:'2', OPERAND2:'1'}), false);
+    t.strictEqual(blocks.lt({OPERAND1:'1', OPERAND2:'1'}), false);
+    t.end();
+});
+
+test('equals', function (t) {
+    t.strictEqual(blocks.equals({OPERAND1:'1', OPERAND2:'2'}), false);
+    t.strictEqual(blocks.equals({OPERAND1:'2', OPERAND2:'1'}), false);
+    t.strictEqual(blocks.equals({OPERAND1:'1', OPERAND2:'1'}), true);
+    t.end();
+});
+
+test('gt', function (t) {
+    t.strictEqual(blocks.gt({OPERAND1:'1', OPERAND2:'2'}), false);
+    t.strictEqual(blocks.gt({OPERAND1:'2', OPERAND2:'1'}), true);
+    t.strictEqual(blocks.gt({OPERAND1:'1', OPERAND2:'1'}), false);
+    t.end();
+});
+
+test('and', function (t) {
+    t.strictEqual(blocks.and({OPERAND1:true, OPERAND2:true}), true);
+    t.strictEqual(blocks.and({OPERAND1:true, OPERAND2:false}), false);
+    t.strictEqual(blocks.and({OPERAND1:false, OPERAND2:false}), false);
+    t.end();
+});
+
+test('or', function (t) {
+    t.strictEqual(blocks.or({OPERAND1:true, OPERAND2:true}), true);
+    t.strictEqual(blocks.or({OPERAND1:true, OPERAND2:false}), true);
+    t.strictEqual(blocks.or({OPERAND1:false, OPERAND2:false}), false);
+    t.end();
+});
+
+test('not', function (t) {
+    t.strictEqual(blocks.not({OPERAND:true}), false);
+    t.strictEqual(blocks.not({OPERAND:false}), true);
+    t.end();
+});
+
+test('random', function (t) {
+    var min = 0;
+    var max = 100;
+    var result = blocks.random({FROM:min, TO:max});
+    t.ok(result >= min);
+    t.ok(result <= max);
+    t.end();
+});
+
+test('random - equal', function (t) {
+    var min = 1;
+    var max = 1;
+    t.strictEqual(blocks.random({FROM:min, TO:max}), min);
+    t.end();
+});
+
+test('random - decimal', function (t) {
+    var min = 0.1;
+    var max = 10;
+    var result = blocks.random({FROM:min, TO:max});
+    t.ok(result >= min);
+    t.ok(result <= max);
+    t.end();
+});
+
+test('random - int', function (t) {
+    var min = 0;
+    var max = 10;
+    var result = blocks.random({FROM:min, TO:max});
+    t.ok(result >= min);
+    t.ok(result <= max);
+    t.end();
+});
+
+test('random - reverse', function (t) {
+    var min = 0;
+    var max = 10;
+    var result = blocks.random({FROM:max, TO:min});
+    t.ok(result >= min);
+    t.ok(result <= max);
+    t.end();
+});
+
+test('join', function (t) {
+    t.strictEqual(blocks.join({STRING1:'foo', STRING2:'bar'}), 'foobar');
+    t.strictEqual(blocks.join({STRING1:'1', STRING2:'2'}), '12');
+    t.end();
+});
+
+test('letterOf', function (t) {
+    t.strictEqual(blocks.letterOf({STRING:'foo', LETTER:0}), '');
+    t.strictEqual(blocks.letterOf({STRING:'foo', LETTER:1}), 'f');
+    t.strictEqual(blocks.letterOf({STRING:'foo', LETTER:2}), 'o');
+    t.strictEqual(blocks.letterOf({STRING:'foo', LETTER:3}), 'o');
+    t.strictEqual(blocks.letterOf({STRING:'foo', LETTER:4}), '');
+    t.strictEqual(blocks.letterOf({STRING:'foo', LETTER:'bar'}), '');
+    t.end();
+});
+
+test('length', function (t) {
+    t.strictEqual(blocks.length({STRING:''}), 0);
+    t.strictEqual(blocks.length({STRING:'foo'}), 3);
+    t.strictEqual(blocks.length({STRING:'1'}), 1);
+    t.strictEqual(blocks.length({STRING:'100'}), 3);
+    t.end();
+});
+
+test('mod', function (t) {
+    t.strictEqual(blocks.mod({NUM1:1, NUM2:1}), 0);
+    t.strictEqual(blocks.mod({NUM1:3, NUM2:6}), 3);
+    t.strictEqual(blocks.mod({NUM1:-3, NUM2:6}), 3);
+    t.end();
+});
+
+test('round', function (t) {
+    t.strictEqual(blocks.round({NUM:1}), 1);
+    t.strictEqual(blocks.round({NUM:1.1}), 1);
+    t.strictEqual(blocks.round({NUM:1.5}), 2);
+    t.end();
+});
+
+test('mathop', function (t) {
+    t.strictEqual(blocks.mathop({OPERATOR:'abs', NUM:-1}), 1);
+    t.strictEqual(blocks.mathop({OPERATOR:'floor', NUM:1.5}), 1);
+    t.strictEqual(blocks.mathop({OPERATOR:'ceiling', NUM:0.1}), 1);
+    t.strictEqual(blocks.mathop({OPERATOR:'sqrt', NUM:1}), 1);
+    t.strictEqual(blocks.mathop({OPERATOR:'sin', NUM:1}), 0.01745240643728351);
+    t.strictEqual(blocks.mathop({OPERATOR:'cos', NUM:1}), 0.9998476951563913);
+    t.strictEqual(blocks.mathop({OPERATOR:'tan', NUM:1}), 0.017455064928217585);
+    t.strictEqual(blocks.mathop({OPERATOR:'asin', NUM:1}), 90);
+    t.strictEqual(blocks.mathop({OPERATOR:'acos', NUM:1}), 0);
+    t.strictEqual(blocks.mathop({OPERATOR:'atan', NUM:1}), 45);
+    t.strictEqual(blocks.mathop({OPERATOR:'ln', NUM:1}), 0);
+    t.strictEqual(blocks.mathop({OPERATOR:'log', NUM:1}), 0);
+    t.strictEqual(blocks.mathop({OPERATOR:'e ^', NUM:1}), 2.718281828459045);
+    t.strictEqual(blocks.mathop({OPERATOR:'10 ^', NUM:1}), 10);
+    t.strictEqual(blocks.mathop({OPERATOR:'undefined', NUM:1}), 0);
+    t.end();
+});
diff --git a/test/unit/engine_adapter.js b/test/unit/engine_adapter.js
new file mode 100644
index 000000000..19289dacd
--- /dev/null
+++ b/test/unit/engine_adapter.js
@@ -0,0 +1,187 @@
+var test = require('tap').test;
+var adapter = require('../../src/engine/adapter');
+var events = require('../fixtures/events.json');
+
+test('spec', function (t) {
+    t.type(adapter, 'function');
+    t.end();
+});
+
+test('invalid inputs', function(t) {
+    var nothing = adapter('not an object');
+    t.type(nothing, 'undefined');
+    nothing = adapter({noxmlproperty:true});
+    t.type(nothing, 'undefined');
+    t.end();
+});
+
+test('create event', function (t) {
+    var result = adapter(events.create);
+
+    t.ok(Array.isArray(result));
+    t.equal(result.length, 2);
+
+    // Outer block
+    t.type(result[0].id, 'string');
+    t.type(result[0].opcode, 'string');
+    t.type(result[0].fields, 'object');
+    t.type(result[0].inputs, 'object');
+    t.type(result[0].inputs['DURATION'], 'object');
+    t.type(result[0].topLevel, 'boolean');
+    t.equal(result[0].topLevel, true);
+
+    // Enclosed shadow block
+    t.type(result[1].id, 'string');
+    t.type(result[1].opcode, 'string');
+    t.type(result[1].fields, 'object');
+    t.type(result[1].inputs, 'object');
+    t.type(result[1].fields['NUM'], 'object');
+    t.type(result[1].fields['NUM'].value, '10');
+    t.type(result[1].topLevel, 'boolean');
+    t.equal(result[1].topLevel, false);
+
+    t.end();
+});
+
+test('create with branch', function (t) {
+    var result = adapter(events.createbranch);
+    // Outer block
+    t.type(result[0].id, 'string');
+    t.type(result[0].opcode, 'string');
+    t.type(result[0].fields, 'object');
+    t.type(result[0].inputs, 'object');
+    t.type(result[0].inputs['SUBSTACK'], 'object');
+    t.type(result[0].topLevel, 'boolean');
+    t.equal(result[0].topLevel, true);
+    // In branch
+    var branchBlockId = result[0].inputs['SUBSTACK']['block'];
+    var branchShadowId = result[0].inputs['SUBSTACK']['shadow'];
+    t.type(branchBlockId, 'string');
+    t.equal(branchShadowId, null);
+    // Find actual branch block
+    var branchBlock = null;
+    for (var i = 0; i < result.length; i++) {
+        if (result[i].id == branchBlockId) {
+            branchBlock = result[i];
+        }
+    }
+    t.type(branchBlock, 'object');
+    t.end();
+});
+
+test('create with two branches', function (t) {
+    var result = adapter(events.createtwobranches);
+    // Outer block
+    t.type(result[0].id, 'string');
+    t.type(result[0].opcode, 'string');
+    t.type(result[0].fields, 'object');
+    t.type(result[0].inputs, 'object');
+    t.type(result[0].inputs['SUBSTACK'], 'object');
+    t.type(result[0].inputs['SUBSTACK2'], 'object');
+    t.type(result[0].topLevel, 'boolean');
+    t.equal(result[0].topLevel, true);
+    // In branchs
+    var firstBranchBlockId = result[0].inputs['SUBSTACK']['block'];
+    var secondBranchBlockId = result[0].inputs['SUBSTACK2']['block'];
+    t.type(firstBranchBlockId, 'string');
+    t.type(secondBranchBlockId, 'string');
+    var firstBranchShadowBlockId = result[0].inputs['SUBSTACK']['shadow'];
+    var secondBranchShadowBlockId = result[0].inputs['SUBSTACK2']['shadow'];
+    t.equal(firstBranchShadowBlockId, null);
+    t.equal(secondBranchShadowBlockId, null);
+    // Find actual branch blocks
+    var firstBranchBlock = null;
+    var secondBranchBlock = null;
+    for (var i = 0; i < result.length; i++) {
+        if (result[i].id == firstBranchBlockId) {
+            firstBranchBlock = result[i];
+        }
+        if (result[i].id == secondBranchBlockId) {
+            secondBranchBlock = result[i];
+        }
+    }
+    t.type(firstBranchBlock, 'object');
+    t.type(secondBranchBlock, 'object');
+    t.end();
+});
+
+test('create with top-level shadow', function (t) {
+    var result = adapter(events.createtoplevelshadow);
+    t.ok(Array.isArray(result));
+    t.equal(result.length, 1);
+
+    // Outer block
+    t.type(result[0].id, 'string');
+    t.type(result[0].opcode, 'string');
+    t.type(result[0].fields, 'object');
+    t.type(result[0].inputs, 'object');
+    t.type(result[0].topLevel, 'boolean');
+    t.equal(result[0].topLevel, true);
+    t.end();
+});
+
+test('create with next connection', function (t) {
+    var result = adapter(events.createwithnext);
+
+    t.ok(Array.isArray(result));
+    t.equal(result.length, 2);
+
+    // First block
+    t.type(result[0].id, 'string');
+    t.type(result[0].opcode, 'string');
+    t.type(result[0].fields, 'object');
+    t.type(result[0].inputs, 'object');
+    t.type(result[0].topLevel, 'boolean');
+    t.equal(result[0].topLevel, true);
+    t.type(result[0].next, 'string');
+    t.equal(result[0].next, result[1].id);
+
+    // Second block
+    t.type(result[1].id, 'string');
+    t.type(result[1].opcode, 'string');
+    t.type(result[1].fields, 'object');
+    t.type(result[1].inputs, 'object');
+    t.type(result[1].topLevel, 'boolean');
+    t.equal(result[1].topLevel, false);
+    t.equal(result[1].next, null);
+
+    t.end();
+});
+
+test('create with obscured shadow', function (t) {
+    var result = adapter(events.createobscuredshadow);
+    t.ok(Array.isArray(result));
+    t.equal(result.length, 4);
+    t.end();
+});
+
+test('create with invalid block xml', function (t) {
+    // Entirely invalid block XML
+    var result = adapter(events.createinvalid);
+    t.ok(Array.isArray(result));
+    t.equal(result.length, 0);
+
+    // Invalid grandchild tag
+    var result2 = adapter(events.createinvalidgrandchild);
+    t.ok(Array.isArray(result2));
+    t.equal(result2.length, 1);
+    t.type(result2[0].id, 'string');
+    t.equal(Object.keys(result2[0].inputs).length, 0);
+    t.equal(Object.keys(result2[0].fields).length, 0);
+
+    t.end();
+});
+
+test('create with invalid xml', function (t) {
+    var result = adapter(events.createbadxml);
+    t.ok(Array.isArray(result));
+    t.equal(result.length, 0);
+    t.end();
+});
+
+test('create with empty field', function (t) {
+    var result = adapter(events.createemptyfield);
+    t.ok(Array.isArray(result));
+    t.equal(result.length, 3);
+    t.end();
+});
diff --git a/test/unit/engine_blocks.js b/test/unit/engine_blocks.js
new file mode 100644
index 000000000..2c9f8f13e
--- /dev/null
+++ b/test/unit/engine_blocks.js
@@ -0,0 +1,544 @@
+var test = require('tap').test;
+var Blocks = require('../../src/engine/blocks');
+
+test('spec', function (t) {
+    var b = new Blocks();
+
+    t.type(Blocks, 'function');
+    t.type(b, 'object');
+    t.ok(b instanceof Blocks);
+
+    t.type(b._blocks, 'object');
+    t.type(b._scripts, 'object');
+    t.ok(Array.isArray(b._scripts));
+
+    t.type(b.createBlock, 'function');
+    t.type(b.moveBlock, 'function');
+    t.type(b.changeBlock, 'function');
+    t.type(b.deleteBlock, 'function');
+    t.type(b.getBlock, 'function');
+    t.type(b.getScripts, 'function');
+    t.type(b.getNextBlock, 'function');
+    t.type(b.getBranch, 'function');
+    t.type(b.getOpcode, 'function');
+
+
+    t.end();
+});
+
+// Getter tests
+test('getBlock', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    var block = b.getBlock('foo');
+    t.type(block, 'object');
+    var notBlock = b.getBlock('?');
+    t.type(notBlock, 'undefined');
+    t.end();
+});
+
+test('getScripts', function (t) {
+    var b = new Blocks();
+    var scripts = b.getScripts();
+    t.type(scripts, 'object');
+    t.equals(scripts.length, 0);
+    // Create two top-level blocks and one not.
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'foo2',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'foo3',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+
+    scripts = b.getScripts();
+    t.type(scripts, 'object');
+    t.equals(scripts.length, 2);
+    t.ok(scripts.indexOf('foo') > -1);
+    t.ok(scripts.indexOf('foo2') > -1);
+    t.equals(scripts.indexOf('foo3'), -1);
+    t.end();
+
+});
+
+test('getNextBlock', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+
+    var next = b.getNextBlock('foo');
+    t.equals(next, null);
+
+    // Add a block with "foo" as its next.
+    b.createBlock({
+        id: 'foo2',
+        opcode: 'TEST_BLOCK',
+        next: 'foo',
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+
+    next = b.getNextBlock('foo2');
+    t.equals(next, 'foo');
+
+    // Block that doesn't exist.
+    var noBlock = b.getNextBlock('?');
+    t.equals(noBlock, null);
+
+    t.end();
+});
+
+test('getBranch', function (t) {
+    var b = new Blocks();
+    // Single branch
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {
+            SUBSTACK: {
+                name: 'SUBSTACK',
+                block: 'foo2',
+                shadow: null
+            }
+        },
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'foo2',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+
+    var branch = b.getBranch('foo');
+    t.equals(branch, 'foo2');
+
+    var notBranch = b.getBranch('?');
+    t.equals(notBranch, null);
+
+    t.end();
+});
+
+test('getBranch2', function (t) {
+    var b = new Blocks();
+    // Second branch
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {
+            SUBSTACK: {
+                name: 'SUBSTACK',
+                block: 'foo2',
+                shadow: null
+            },
+            SUBSTACK2: {
+                name: 'SUBSTACK2',
+                block: 'foo3',
+                shadow: null
+            }
+        },
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'foo2',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+    b.createBlock({
+        id: 'foo3',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+
+    var branch1 = b.getBranch('foo', 1);
+    var branch2 = b.getBranch('foo', 2);
+    t.equals(branch1, 'foo2');
+    t.equals(branch2, 'foo3');
+
+    t.end();
+});
+
+test('getBranch with none', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    var noBranch = b.getBranch('foo');
+    t.equals(noBranch, null);
+    t.end();
+});
+
+test('getOpcode', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    var opcode = b.getOpcode('foo');
+    t.equals(opcode, 'TEST_BLOCK');
+    var notOpcode = b.getOpcode('?');
+    t.equals(notOpcode, null);
+    t.end();
+});
+
+// Block events tests
+test('create', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+
+    t.type(b._blocks['foo'], 'object');
+    t.equal(b._blocks['foo'].opcode, 'TEST_BLOCK');
+    t.notEqual(b._scripts.indexOf('foo'), -1);
+    t.end();
+});
+
+test('move', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'bar',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+
+    // Attach 'bar' to the end of 'foo'
+    b.moveBlock({
+        id: 'bar',
+        newParent: 'foo'
+    });
+    t.equal(b._scripts.length, 1);
+    t.equal(Object.keys(b._blocks).length, 2);
+    t.equal(b._blocks['foo'].next, 'bar');
+
+    // Detach 'bar' from 'foo'
+    b.moveBlock({
+        id: 'bar',
+        oldParent: 'foo'
+    });
+    t.equal(b._scripts.length, 2);
+    t.equal(Object.keys(b._blocks).length, 2);
+    t.equal(b._blocks['foo'].next, null);
+
+    t.end();
+});
+
+test('move into empty', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'bar',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.moveBlock({
+        id: 'bar',
+        newInput: 'fooInput',
+        newParent: 'foo'
+    });
+    t.equal(b._blocks['foo'].inputs['fooInput'].block, 'bar');
+    t.end();
+});
+
+test('move no obscure shadow', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {
+            'fooInput': {
+                name: 'fooInput',
+                block: 'x',
+                shadow: 'y'
+            }
+        },
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'bar',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.moveBlock({
+        id: 'bar',
+        newInput: 'fooInput',
+        newParent: 'foo'
+    });
+    t.equal(b._blocks['foo'].inputs['fooInput'].block, 'bar');
+    t.equal(b._blocks['foo'].inputs['fooInput'].shadow, 'y');
+    t.end();
+});
+
+test('change', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {
+            someField: {
+                name: 'someField',
+                value: 'initial-value'
+            }
+        },
+        inputs: {},
+        topLevel: true
+    });
+
+    // Test that the field is updated
+    t.equal(b._blocks['foo'].fields.someField.value, 'initial-value');
+
+    b.changeBlock({
+        element: 'field',
+        id: 'foo',
+        name: 'someField',
+        value: 'final-value'
+    });
+
+    t.equal(b._blocks['foo'].fields.someField.value, 'final-value');
+
+    // Invalid cases
+    // No `element`
+    b.changeBlock({
+        id: 'foo',
+        name: 'someField',
+        value: 'invalid-value'
+    });
+    t.equal(b._blocks['foo'].fields.someField.value, 'final-value');
+
+    // No block ID
+    b.changeBlock({
+        element: 'field',
+        name: 'someField',
+        value: 'invalid-value'
+    });
+    t.equal(b._blocks['foo'].fields.someField.value, 'final-value');
+
+    // No such field
+    b.changeBlock({
+        element: 'field',
+        id: 'foo',
+        name: 'someWrongField',
+        value: 'final-value'
+    });
+    t.equal(b._blocks['foo'].fields.someField.value, 'final-value');
+
+    t.end();
+});
+
+test('delete', function (t) {
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.deleteBlock({
+        id: 'foo'
+    });
+
+    t.type(b._blocks['foo'], 'undefined');
+    t.equal(b._scripts.indexOf('foo'), -1);
+    t.end();
+});
+
+test('delete chain', function (t) {
+    // Create a chain of connected blocks and delete the top one.
+    // All of them should be deleted.
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: 'foo2',
+        fields: {},
+        inputs: {},
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'foo2',
+        opcode: 'TEST_BLOCK',
+        next: 'foo3',
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+    b.createBlock({
+        id: 'foo3',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+    b.deleteBlock({
+        id: 'foo'
+    });
+    t.type(b._blocks['foo'], 'undefined');
+    t.type(b._blocks['foo2'], 'undefined');
+    t.type(b._blocks['foo3'], 'undefined');
+    t.equal(b._scripts.indexOf('foo'), -1);
+    t.equal(Object.keys(b._blocks).length, 0);
+    t.equal(b._scripts.length, 0);
+    t.end();
+});
+
+test('delete inputs', function (t) {
+    // Create a block with two inputs, one of which has its own input.
+    // Delete the block - all of them should be deleted.
+    var b = new Blocks();
+    b.createBlock({
+        id: 'foo',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {
+            input1: {
+                name: 'input1',
+                block: 'foo2',
+                shadow: 'foo2'
+            },
+            SUBSTACK: {
+                name: 'SUBSTACK',
+                block: 'foo3',
+                shadow: null
+            }
+        },
+        topLevel: true
+    });
+    b.createBlock({
+        id: 'foo2',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+    b.createBlock({
+        id: 'foo5',
+        opcode: 'TEST_OBSCURED_SHADOW',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+    b.createBlock({
+        id: 'foo3',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {
+            subinput: {
+                name: 'subinput',
+                block: 'foo4',
+                shadow: 'foo5'
+            }
+        },
+        topLevel: false
+    });
+    b.createBlock({
+        id: 'foo4',
+        opcode: 'TEST_BLOCK',
+        next: null,
+        fields: {},
+        inputs: {},
+        topLevel: false
+    });
+    b.deleteBlock({
+        id: 'foo'
+    });
+    t.type(b._blocks['foo'], 'undefined');
+    t.type(b._blocks['foo2'], 'undefined');
+    t.type(b._blocks['foo3'], 'undefined');
+    t.type(b._blocks['foo4'], 'undefined');
+    t.type(b._blocks['foo5'], 'undefined');
+    t.equal(b._scripts.indexOf('foo'), -1);
+    t.equal(Object.keys(b._blocks).length, 0);
+    t.equal(b._scripts.length, 0);
+    t.end();
+});
diff --git a/test/unit/engine_runtime.js b/test/unit/engine_runtime.js
new file mode 100644
index 000000000..40757c054
--- /dev/null
+++ b/test/unit/engine_runtime.js
@@ -0,0 +1,12 @@
+var test = require('tap').test;
+var Runtime = require('../../src/engine/runtime');
+
+test('spec', function (t) {
+    var r = new Runtime();
+
+    t.type(Runtime, 'function');
+    t.type(r, 'object');
+    t.ok(r instanceof Runtime);
+
+    t.end();
+});
diff --git a/test/unit/sequencer.js b/test/unit/engine_sequencer.js
similarity index 100%
rename from test/unit/sequencer.js
rename to test/unit/engine_sequencer.js
diff --git a/test/unit/thread.js b/test/unit/engine_thread.js
similarity index 100%
rename from test/unit/thread.js
rename to test/unit/engine_thread.js
diff --git a/test/unit/import_sb2.js b/test/unit/import_sb2.js
new file mode 100644
index 000000000..be4d62864
--- /dev/null
+++ b/test/unit/import_sb2.js
@@ -0,0 +1,88 @@
+var fs = require('fs');
+var path = require('path');
+var test = require('tap').test;
+
+var clone = require('../../src/sprites/clone');
+var runtime = require('../../src/engine/runtime');
+var sb2 = require('../../src/import/sb2import');
+
+test('spec', function (t) {
+    t.type(sb2, 'function');
+    t.end();
+});
+
+test('default', function (t) {
+    // Get SB2 JSON (string)
+    var uri = path.resolve(__dirname, '../fixtures/default.json');
+    var file = fs.readFileSync(uri, 'utf8');
+
+    // Create runtime instance & load SB2 into it
+    var rt = new runtime();
+    sb2(file, rt);
+
+    // Test
+    t.type(file, 'string');
+    t.type(rt, 'object');
+    t.type(rt.targets, 'object');
+
+    t.ok(rt.targets[0] instanceof clone);
+    t.type(rt.targets[0].id, 'string');
+    t.type(rt.targets[0].blocks, 'object');
+    t.type(rt.targets[0].variables, 'object');
+    t.type(rt.targets[0].lists, 'object');
+
+    t.equal(rt.targets[0].isOriginal, true);
+    t.equal(rt.targets[0].currentCostume, 0);
+    t.equal(rt.targets[0].isOriginal, true);
+    t.equal(rt.targets[0].isStage, true);
+
+    t.ok(rt.targets[1] instanceof clone);
+    t.type(rt.targets[1].id, 'string');
+    t.type(rt.targets[1].blocks, 'object');
+    t.type(rt.targets[1].variables, 'object');
+    t.type(rt.targets[1].lists, 'object');
+
+    t.equal(rt.targets[1].isOriginal, true);
+    t.equal(rt.targets[1].currentCostume, 0);
+    t.equal(rt.targets[1].isOriginal, true);
+    t.equal(rt.targets[1].isStage, false);
+    t.end();
+});
+
+test('demo', function (t) {
+    // Get SB2 JSON (string)
+    var uri = path.resolve(__dirname, '../fixtures/demo.json');
+    var file = fs.readFileSync(uri, 'utf8');
+
+    // Create runtime instance & load SB2 into it
+    var rt = new runtime();
+    sb2(file, rt);
+
+    // Test
+    t.type(file, 'string');
+    t.type(rt, 'object');
+    t.type(rt.targets, 'object');
+
+    t.ok(rt.targets[0] instanceof clone);
+    t.type(rt.targets[0].id, 'string');
+    t.type(rt.targets[0].blocks, 'object');
+    t.type(rt.targets[0].variables, 'object');
+    t.type(rt.targets[0].lists, 'object');
+
+    t.equal(rt.targets[0].isOriginal, true);
+    t.equal(rt.targets[0].currentCostume, 0);
+    t.equal(rt.targets[0].isOriginal, true);
+    t.equal(rt.targets[0].isStage, true);
+
+    t.ok(rt.targets[1] instanceof clone);
+    t.type(rt.targets[1].id, 'string');
+    t.type(rt.targets[1].blocks, 'object');
+    t.type(rt.targets[1].variables, 'object');
+    t.type(rt.targets[1].lists, 'object');
+
+    t.equal(rt.targets[1].isOriginal, true);
+    t.equal(rt.targets[1].currentCostume, 0);
+    t.equal(rt.targets[1].isOriginal, true);
+    t.equal(rt.targets[1].isStage, false);
+    t.end();
+});
diff --git a/test/unit/runtime.js b/test/unit/runtime.js
deleted file mode 100644
index 0e41ed5be..000000000
--- a/test/unit/runtime.js
+++ /dev/null
@@ -1,89 +0,0 @@
-var test = require('tap').test;
-var Runtime = require('../../src/engine/runtime');
-
-test('spec', function (t) {
-    var r = new Runtime();
-
-    t.type(Runtime, 'function');
-    t.type(r, 'object');
-    t.ok(r instanceof Runtime);
-
-    t.type(r.blocks, 'object');
-    t.type(r.stacks, 'object');
-    t.ok(Array.isArray(r.stacks));
-
-    t.type(r.createBlock, 'function');
-    t.type(r.moveBlock, 'function');
-    t.type(r.changeBlock, 'function');
-    t.type(r.deleteBlock, 'function');
-
-    t.end();
-});
-
-test('create', function (t) {
-    var r = new Runtime();
-    r.createBlock({
-        id: 'foo',
-        opcode: 'TEST_BLOCK',
-        next: null,
-        fields: {}
-    });
-
-    t.type(r.blocks['foo'], 'object');
-    t.equal(r.blocks['foo'].opcode, 'TEST_BLOCK');
-    t.notEqual(r.stacks.indexOf('foo'), -1);
-    t.end();
-});
-
-test('move', function (t) {
-    var r = new Runtime();
-    r.createBlock({
-        id: 'foo',
-        opcode: 'TEST_BLOCK',
-        next: null,
-        fields: {}
-    });
-    r.createBlock({
-        id: 'bar',
-        opcode: 'TEST_BLOCK',
-        next: null,
-        fields: {}
-    });
-
-    // Attach 'bar' to the end of 'foo'
-    r.moveBlock({
-        id: 'bar',
-        newParent: 'foo'
-    });
-    t.equal(r.stacks.length, 1);
-    t.equal(Object.keys(r.blocks).length, 2);
-    t.equal(r.blocks['foo'].next, 'bar');
-
-    // Detach 'bar' from 'foo'
-    r.moveBlock({
-        id: 'bar',
-        oldParent: 'foo'
-    });
-    t.equal(r.stacks.length, 2);
-    t.equal(Object.keys(r.blocks).length, 2);
-    t.equal(r.blocks['foo'].next, null);
-
-    t.end();
-});
-
-test('delete', function (t) {
-    var r = new Runtime();
-    r.createBlock({
-        id: 'foo',
-        opcode: 'TEST_BLOCK',
-        next: null,
-        fields: {}
-    });
-    r.deleteBlock({
-        id: 'foo'
-    });
-
-    t.type(r.blocks['foo'], 'undefined');
-    t.equal(r.stacks.indexOf('foo'), -1);
-    t.end();
-});
diff --git a/test/unit/sprites_clone.js b/test/unit/sprites_clone.js
new file mode 100644
index 000000000..246e1b955
--- /dev/null
+++ b/test/unit/sprites_clone.js
@@ -0,0 +1,13 @@
+var test = require('tap').test;
+var Clone = require('../../src/sprites/clone');
+var Sprite = require('../../src/sprites/sprite');
+
+test('clone effects', function (t) {
+    // Create two clones and ensure they have different graphic effect objects.
+    // Regression test for Github issue #224
+    var spr = new Sprite();
+    var a = new Clone(spr, null);
+    var b = new Clone(spr, null);
+    t.ok(a.effects !== b.effects);
+    t.end();
+});
diff --git a/test/unit/util_cast.js b/test/unit/util_cast.js
new file mode 100644
index 000000000..1d372213e
--- /dev/null
+++ b/test/unit/util_cast.js
@@ -0,0 +1,179 @@
+var test = require('tap').test;
+var cast = require('../../src/util/cast');
+
+test('toNumber', function (t) {
+    // Numeric
+    t.strictEqual(cast.toNumber(0), 0);
+    t.strictEqual(cast.toNumber(1), 1);
+    t.strictEqual(cast.toNumber(3.14), 3.14);
+
+    // String
+    t.strictEqual(cast.toNumber('0'), 0);
+    t.strictEqual(cast.toNumber('1'), 1);
+    t.strictEqual(cast.toNumber('3.14'), 3.14);
+    t.strictEqual(cast.toNumber('0.1e10'), 1000000000);
+    t.strictEqual(cast.toNumber('foobar'), 0);
+
+    // Boolean
+    t.strictEqual(cast.toNumber(true), 1);
+    t.strictEqual(cast.toNumber(false), 0);
+    t.strictEqual(cast.toNumber('true'), 0);
+    t.strictEqual(cast.toNumber('false'), 0);
+
+    // Undefined & object
+    t.strictEqual(cast.toNumber(undefined), 0);
+    t.strictEqual(cast.toNumber({}), 0);
+    t.strictEqual(cast.toNumber(NaN), 0);
+    t.end();
+});
+
+test('toBoolean', function (t) {
+    // Numeric
+    t.strictEqual(cast.toBoolean(0), false);
+    t.strictEqual(cast.toBoolean(1), true);
+    t.strictEqual(cast.toBoolean(3.14), true);
+
+    // String
+    t.strictEqual(cast.toBoolean('0'), false);
+    t.strictEqual(cast.toBoolean('1'), true);
+    t.strictEqual(cast.toBoolean('3.14'), true);
+    t.strictEqual(cast.toBoolean('0.1e10'), true);
+    t.strictEqual(cast.toBoolean('foobar'), true);
+
+    // Boolean
+    t.strictEqual(cast.toBoolean(true), true);
+    t.strictEqual(cast.toBoolean(false), false);
+
+    // Undefined & object
+    t.strictEqual(cast.toBoolean(undefined), false);
+    t.strictEqual(cast.toBoolean({}), true);
+    t.end();
+});
+
+test('toString', function (t) {
+    // Numeric
+    t.strictEqual(cast.toString(0), '0');
+    t.strictEqual(cast.toString(1), '1');
+    t.strictEqual(cast.toString(3.14), '3.14');
+
+    // String
+    t.strictEqual(cast.toString('0'), '0');
+    t.strictEqual(cast.toString('1'), '1');
+    t.strictEqual(cast.toString('3.14'), '3.14');
+    t.strictEqual(cast.toString('0.1e10'), '0.1e10');
+    t.strictEqual(cast.toString('foobar'), 'foobar');
+
+    // Boolean
+    t.strictEqual(cast.toString(true), 'true');
+    t.strictEqual(cast.toString(false), 'false');
+
+    // Undefined & object
+    t.strictEqual(cast.toString(undefined), 'undefined');
+    t.strictEqual(cast.toString({}), '[object Object]');
+    t.end();
+});
+
+test('toRbgColorList', function (t) {
+    // Hex (minimal, see "color" util tests)
+    t.deepEqual(cast.toRgbColorList('#000'), [0,0,0]);
+    t.deepEqual(cast.toRgbColorList('#000000'), [0,0,0]);
+    t.deepEqual(cast.toRgbColorList('#fff'), [255,255,255]);
+    t.deepEqual(cast.toRgbColorList('#ffffff'), [255,255,255]);
+
+    // Decimal (minimal, see "color" util tests)
+    t.deepEqual(cast.toRgbColorList(0), [0,0,0]);
+    t.deepEqual(cast.toRgbColorList(1), [0,0,1]);
+    t.deepEqual(cast.toRgbColorList(16777215), [255,255,255]);
+
+    // Malformed
+    t.deepEqual(cast.toRgbColorList('ffffff'), [0,0,0]);
+    t.deepEqual(cast.toRgbColorList('foobar'), [0,0,0]);
+    t.end();
+});
+
+test('compare', function (t) {
+    // Numeric
+    t.strictEqual(cast.compare(0, 0), 0);
+    t.strictEqual(cast.compare(1, 0), 1);
+    t.strictEqual(cast.compare(0, 1), -1);
+    t.strictEqual(cast.compare(1, 1), 0);
+
+    // String
+    t.strictEqual(cast.compare('0', '0'), 0);
+    t.strictEqual(cast.compare('0.1e10', '1000000000'), 0);
+    t.strictEqual(cast.compare('foobar', 'FOOBAR'), 0);
+    t.ok(cast.compare('dog', 'cat') > 0);
+
+    // Boolean
+    t.strictEqual(cast.compare(true, true), 0);
+    t.strictEqual(cast.compare(true, false), 1);
+    t.strictEqual(cast.compare(false, true), -1);
+    t.strictEqual(cast.compare(true, true), 0);
+
+    // Undefined & object
+    t.strictEqual(cast.compare(undefined, undefined), 0);
+    t.strictEqual(cast.compare(undefined, 'undefined'), 0);
+    t.strictEqual(cast.compare({}, {}), 0);
+    t.strictEqual(cast.compare({}, '[object Object]'), 0);
+    t.end();
+});
+
+test('isInt', function (t) {
+    // Numeric
+    t.strictEqual(cast.isInt(0), true);
+    t.strictEqual(cast.isInt(1), true);
+    t.strictEqual(cast.isInt(0.0), true);
+    t.strictEqual(cast.isInt(3.14), false);
+    t.strictEqual(cast.isInt(NaN), true);
+
+    // String
+    t.strictEqual(cast.isInt('0'), true);
+    t.strictEqual(cast.isInt('1'), true);
+    t.strictEqual(cast.isInt('0.0'), false);
+    t.strictEqual(cast.isInt('0.1e10'), false);
+    t.strictEqual(cast.isInt('3.14'), false);
+
+    // Boolean
+    t.strictEqual(cast.isInt(true), true);
+    t.strictEqual(cast.isInt(false), true);
+
+    // Undefined & object
+    t.strictEqual(cast.isInt(undefined), false);
+    t.strictEqual(cast.isInt({}), false);
+    t.end();
+});
+
+test('toListIndex', function (t) {
+    var list = [0,1,2,3,4,5];
+    var empty = [];
+
+    // Valid
+    t.strictEqual(cast.toListIndex(1, list.length), 1);
+    t.strictEqual(cast.toListIndex(6, list.length), 6);
+
+    // Invalid
+    t.strictEqual(cast.toListIndex(-1, list.length), cast.LIST_INVALID);
+    t.strictEqual(cast.toListIndex(0.1, list.length), cast.LIST_INVALID);
+    t.strictEqual(cast.toListIndex(0, list.length), cast.LIST_INVALID);
+    t.strictEqual(cast.toListIndex(7, list.length), cast.LIST_INVALID);
+
+    // "all"
+    t.strictEqual(cast.toListIndex('all', list.length), cast.LIST_ALL);
+
+    // "last"
+    t.strictEqual(cast.toListIndex('last', list.length), list.length);
+    t.strictEqual(cast.toListIndex('last', empty.length), cast.LIST_INVALID);
+
+    // "random"
+    var random = cast.toListIndex('random', list.length);
+    t.ok(random <= list.length);
+    t.ok(random > 0);
+    t.strictEqual(cast.toListIndex('random', empty.length), cast.LIST_INVALID);
+
+    // "any" (alias for "random")
+    var any = cast.toListIndex('any', list.length);
+    t.ok(any <= list.length);
+    t.ok(any > 0);
+    t.strictEqual(cast.toListIndex('any', empty.length), cast.LIST_INVALID);
+    t.end();
+});
diff --git a/test/unit/util_color.js b/test/unit/util_color.js
new file mode 100644
index 000000000..ba7fa059c
--- /dev/null
+++ b/test/unit/util_color.js
@@ -0,0 +1,62 @@
+var test = require('tap').test;
+var color = require('../../src/util/color');
+
+test('decimalToHex', function (t) {
+    t.strictEqual(color.decimalToHex(0), '#000000');
+    t.strictEqual(color.decimalToHex(1), '#000001');
+    t.strictEqual(color.decimalToHex(16777215), '#ffffff');
+    t.strictEqual(color.decimalToHex(-16777215), '#000001');
+    t.strictEqual(color.decimalToHex(99999999), '#5f5e0ff');
+    t.end();
+});
+
+test('decimalToRgb', function (t) {
+    t.deepEqual(color.decimalToRgb(0), {r:0,g:0,b:0});
+    t.deepEqual(color.decimalToRgb(1), {r:0,g:0,b:1});
+    t.deepEqual(color.decimalToRgb(16777215), {r:255,g:255,b:255});
+    t.deepEqual(color.decimalToRgb(-16777215), {r:0,g:0,b:1});
+    t.deepEqual(color.decimalToRgb(99999999), {r:245,g:224,b:255});
+    t.end();
+});
+
+test('hexToRgb', function (t) {
+    t.deepEqual(color.hexToRgb('#000'), {r:0,g:0,b:0});
+    t.deepEqual(color.hexToRgb('#000000'), {r:0,g:0,b:0});
+    t.deepEqual(color.hexToRgb('#fff'), {r:255,g:255,b:255});
+    t.deepEqual(color.hexToRgb('#ffffff'), {r:255,g:255,b:255});
+    t.deepEqual(color.hexToRgb('#0fa'), {r:0,g:255,b:170});
+    t.deepEqual(color.hexToRgb('#00ffaa'), {r:0,g:255,b:170});
+
+    t.deepEqual(color.hexToRgb('000'), {r:0,g:0,b:0});
+    t.deepEqual(color.hexToRgb('fff'), {r:255,g:255,b:255});
+    t.deepEqual(color.hexToRgb('00ffaa'), {r:0,g:255,b:170});
+
+    t.deepEqual(color.hexToRgb('0'), null);
+    t.deepEqual(color.hexToRgb('hello world'), null);
+
+    t.end();
+});
+
+test('rgbToHex', function (t) {
+    t.strictEqual(color.rgbToHex({r:0,g:0,b:0}), '#000000');
+    t.strictEqual(color.rgbToHex({r:255,g:255,b:255}), '#ffffff');
+    t.strictEqual(color.rgbToHex({r:0,g:255,b:170}), '#00ffaa');
+    t.end();
+});
+
+test('rgbToDecimal', function (t) {
+    t.strictEqual(color.rgbToDecimal({r:0,g:0,b:0}), 0);
+    t.strictEqual(color.rgbToDecimal({r:255,g:255,b:255}), 16777215);
+    t.strictEqual(color.rgbToDecimal({r:0,g:255,b:170}), 65450);
+    t.end();
+});
+
+test('hexToDecimal', function (t) {
+    t.strictEqual(color.hexToDecimal('#000'), 0);
+    t.strictEqual(color.hexToDecimal('#000000'), 0);
+    t.strictEqual(color.hexToDecimal('#fff'), 16777215);
+    t.strictEqual(color.hexToDecimal('#ffffff'), 16777215);
+    t.strictEqual(color.hexToDecimal('#0fa'), 65450);
+    t.strictEqual(color.hexToDecimal('#00ffaa'), 65450);
+    t.end();
+});
diff --git a/test/unit/util_math.js b/test/unit/util_math.js
new file mode 100644
index 000000000..b198ef1d3
--- /dev/null
+++ b/test/unit/util_math.js
@@ -0,0 +1,36 @@
+var test = require('tap').test;
+var math = require('../../src/util/math-util');
+
+test('degToRad', function (t) {
+    t.strictEqual(math.degToRad(0), 0);
+    t.strictEqual(math.degToRad(1), 0.017453292519943295);
+    t.strictEqual(math.degToRad(180), Math.PI);
+    t.strictEqual(math.degToRad(360), 2 * Math.PI);
+    t.strictEqual(math.degToRad(720), 4 * Math.PI);
+    t.end();
+});
+
+test('radToDeg', function (t) {
+    t.strictEqual(math.radToDeg(0), 0);
+    t.strictEqual(math.radToDeg(1), 57.29577951308232);
+    t.strictEqual(math.radToDeg(180), 10313.240312354817);
+    t.strictEqual(math.radToDeg(360), 20626.480624709635);
+    t.strictEqual(math.radToDeg(720), 41252.96124941927);
+    t.end();
+});
+
+test('clamp', function (t) {
+    t.strictEqual(math.clamp(0, 0, 10), 0);
+    t.strictEqual(math.clamp(1, 0, 10), 1);
+    t.strictEqual(math.clamp(-10, 0, 10), 0);
+    t.strictEqual(math.clamp(100, 0, 10), 10);
+    t.end();
+});
+
+test('wrapClamp', function (t) {
+    t.strictEqual(math.wrapClamp(0, 0, 10), 0);
+    t.strictEqual(math.wrapClamp(1, 0, 10), 1);
+    t.strictEqual(math.wrapClamp(-10, 0, 10), 1);
+    t.strictEqual(math.wrapClamp(100, 0, 10), 1);
+    t.end();
+});
diff --git a/test/unit/timer.js b/test/unit/util_timer.js
similarity index 100%
rename from test/unit/timer.js
rename to test/unit/util_timer.js
diff --git a/test/unit/util_xml.js b/test/unit/util_xml.js
new file mode 100644
index 000000000..1906a2ab6
--- /dev/null
+++ b/test/unit/util_xml.js
@@ -0,0 +1,9 @@
+var test = require('tap').test;
+var xml = require('../../src/util/xml-escape');
+
+test('escape', function (t) {
+    var input = '<foo bar="he & llo \'"></foo>';
+    var output = '&lt;foo bar=&quot;he &amp; llo &apos;&quot;&gt;&lt;/foo&gt;';
+    t.strictEqual(xml(input), output);
+    t.end();
+});
diff --git a/vm.js b/vm.js
deleted file mode 100644
index fb2523c87..000000000
--- a/vm.js
+++ /dev/null
@@ -1,13805 +0,0 @@
-/******/ (function(modules) { // webpackBootstrap
-/******/ 	// The module cache
-/******/ 	var installedModules = {};
-
-/******/ 	// The require function
-/******/ 	function __webpack_require__(moduleId) {
-
-/******/ 		// Check if module is in cache
-/******/ 		if(installedModules[moduleId])
-/******/ 			return installedModules[moduleId].exports;
-
-/******/ 		// Create a new module (and put it into the cache)
-/******/ 		var module = installedModules[moduleId] = {
-/******/ 			exports: {},
-/******/ 			id: moduleId,
-/******/ 			loaded: false
-/******/ 		};
-
-/******/ 		// Execute the module function
-/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
-
-/******/ 		// Flag the module as loaded
-/******/ 		module.loaded = true;
-
-/******/ 		// Return the exports of the module
-/******/ 		return module.exports;
-/******/ 	}
-
-
-/******/ 	// expose the modules object (__webpack_modules__)
-/******/ 	__webpack_require__.m = modules;
-
-/******/ 	// expose the module cache
-/******/ 	__webpack_require__.c = installedModules;
-
-/******/ 	// __webpack_public_path__
-/******/ 	__webpack_require__.p = "";
-
-/******/ 	// Load entry module and return exports
-/******/ 	return __webpack_require__(0);
-/******/ })
-/************************************************************************/
-/******/ ([
-/* 0 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var EventEmitter = __webpack_require__(1);
-	var util = __webpack_require__(2);
-
-	var Runtime = __webpack_require__(6);
-	var adapter = __webpack_require__(13);
-
-	/**
-	 * Handles connections between blocks, stage, and extensions.
-	 *
-	 * @author Andrew Sliwinski <ascii@media.mit.edu>
-	 */
-	function VirtualMachine () {
-	    var instance = this;
-
-	    // Bind event emitter and runtime to VM instance
-	    // @todo Post message (Web Worker) polyfill
-	    EventEmitter.call(instance);
-	    instance.runtime = new Runtime();
-
-	    /**
-	     * Event listener for blocks. Handles validation and serves as a generic
-	     * adapter between the blocks and the runtime interface.
-	     *
-	     * @param {Object} Blockly "block" event
-	     */
-	    instance.blockListener = function (e) {
-	        // Validate event
-	        if (typeof e !== 'object') return;
-	        if (typeof e.blockId !== 'string') return;
-
-	        // Blocks
-	        switch (e.type) {
-	        case 'create':
-	            instance.runtime.createBlock(adapter(e), false);
-	            break;
-	        case 'change':
-	            instance.runtime.changeBlock({
-	                id: e.blockId,
-	                element: e.element,
-	                name: e.name,
-	                value: e.newValue
-	            });
-	            break;
-	        case 'move':
-	            instance.runtime.moveBlock({
-	                id: e.blockId,
-	                oldParent: e.oldParentId,
-	                oldField: e.oldInputName,
-	                newParent: e.newParentId,
-	                newField: e.newInputName
-	            });
-	            break;
-	        case 'delete':
-	            instance.runtime.deleteBlock({
-	                id: e.blockId
-	            });
-	            break;
-	        }
-	    };
-
-	    instance.flyoutBlockListener = function (e) {
-	        switch (e.type) {
-	        case 'create':
-	            instance.runtime.createBlock(adapter(e), true);
-	            break;
-	        case 'change':
-	            instance.runtime.changeBlock({
-	                id: e.blockId,
-	                element: e.element,
-	                name: e.name,
-	                value: e.newValue
-	            });
-	            break;
-	        case 'delete':
-	            instance.runtime.deleteBlock({
-	                id: e.blockId
-	            });
-	            break;
-	        }
-	    };
-	}
-
-	/**
-	 * Inherit from EventEmitter
-	 */
-	util.inherits(VirtualMachine, EventEmitter);
-
-	/**
-	 * Export and bind to `window`
-	 */
-	module.exports = VirtualMachine;
-	if (typeof window !== 'undefined') window.VirtualMachine = module.exports;
-
-
-/***/ },
-/* 1 */
-/***/ function(module, exports) {
-
-	// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	function EventEmitter() {
-	  this._events = this._events || {};
-	  this._maxListeners = this._maxListeners || undefined;
-	}
-	module.exports = EventEmitter;
-
-	// Backwards-compat with node 0.10.x
-	EventEmitter.EventEmitter = EventEmitter;
-
-	EventEmitter.prototype._events = undefined;
-	EventEmitter.prototype._maxListeners = undefined;
-
-	// By default EventEmitters will print a warning if more than 10 listeners are
-	// added to it. This is a useful default which helps finding memory leaks.
-	EventEmitter.defaultMaxListeners = 10;
-
-	// Obviously not all Emitters should be limited to 10. This function allows
-	// that to be increased. Set to zero for unlimited.
-	EventEmitter.prototype.setMaxListeners = function(n) {
-	  if (!isNumber(n) || n < 0 || isNaN(n))
-	    throw TypeError('n must be a positive number');
-	  this._maxListeners = n;
-	  return this;
-	};
-
-	EventEmitter.prototype.emit = function(type) {
-	  var er, handler, len, args, i, listeners;
-
-	  if (!this._events)
-	    this._events = {};
-
-	  // If there is no 'error' event listener then throw.
-	  if (type === 'error') {
-	    if (!this._events.error ||
-	        (isObject(this._events.error) && !this._events.error.length)) {
-	      er = arguments[1];
-	      if (er instanceof Error) {
-	        throw er; // Unhandled 'error' event
-	      }
-	      throw TypeError('Uncaught, unspecified "error" event.');
-	    }
-	  }
-
-	  handler = this._events[type];
-
-	  if (isUndefined(handler))
-	    return false;
-
-	  if (isFunction(handler)) {
-	    switch (arguments.length) {
-	      // fast cases
-	      case 1:
-	        handler.call(this);
-	        break;
-	      case 2:
-	        handler.call(this, arguments[1]);
-	        break;
-	      case 3:
-	        handler.call(this, arguments[1], arguments[2]);
-	        break;
-	      // slower
-	      default:
-	        args = Array.prototype.slice.call(arguments, 1);
-	        handler.apply(this, args);
-	    }
-	  } else if (isObject(handler)) {
-	    args = Array.prototype.slice.call(arguments, 1);
-	    listeners = handler.slice();
-	    len = listeners.length;
-	    for (i = 0; i < len; i++)
-	      listeners[i].apply(this, args);
-	  }
-
-	  return true;
-	};
-
-	EventEmitter.prototype.addListener = function(type, listener) {
-	  var m;
-
-	  if (!isFunction(listener))
-	    throw TypeError('listener must be a function');
-
-	  if (!this._events)
-	    this._events = {};
-
-	  // To avoid recursion in the case that type === "newListener"! Before
-	  // adding it to the listeners, first emit "newListener".
-	  if (this._events.newListener)
-	    this.emit('newListener', type,
-	              isFunction(listener.listener) ?
-	              listener.listener : listener);
-
-	  if (!this._events[type])
-	    // Optimize the case of one listener. Don't need the extra array object.
-	    this._events[type] = listener;
-	  else if (isObject(this._events[type]))
-	    // If we've already got an array, just append.
-	    this._events[type].push(listener);
-	  else
-	    // Adding the second element, need to change to array.
-	    this._events[type] = [this._events[type], listener];
-
-	  // Check for listener leak
-	  if (isObject(this._events[type]) && !this._events[type].warned) {
-	    if (!isUndefined(this._maxListeners)) {
-	      m = this._maxListeners;
-	    } else {
-	      m = EventEmitter.defaultMaxListeners;
-	    }
-
-	    if (m && m > 0 && this._events[type].length > m) {
-	      this._events[type].warned = true;
-	      console.error('(node) warning: possible EventEmitter memory ' +
-	                    'leak detected. %d listeners added. ' +
-	                    'Use emitter.setMaxListeners() to increase limit.',
-	                    this._events[type].length);
-	      if (typeof console.trace === 'function') {
-	        // not supported in IE 10
-	        console.trace();
-	      }
-	    }
-	  }
-
-	  return this;
-	};
-
-	EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-
-	EventEmitter.prototype.once = function(type, listener) {
-	  if (!isFunction(listener))
-	    throw TypeError('listener must be a function');
-
-	  var fired = false;
-
-	  function g() {
-	    this.removeListener(type, g);
-
-	    if (!fired) {
-	      fired = true;
-	      listener.apply(this, arguments);
-	    }
-	  }
-
-	  g.listener = listener;
-	  this.on(type, g);
-
-	  return this;
-	};
-
-	// emits a 'removeListener' event iff the listener was removed
-	EventEmitter.prototype.removeListener = function(type, listener) {
-	  var list, position, length, i;
-
-	  if (!isFunction(listener))
-	    throw TypeError('listener must be a function');
-
-	  if (!this._events || !this._events[type])
-	    return this;
-
-	  list = this._events[type];
-	  length = list.length;
-	  position = -1;
-
-	  if (list === listener ||
-	      (isFunction(list.listener) && list.listener === listener)) {
-	    delete this._events[type];
-	    if (this._events.removeListener)
-	      this.emit('removeListener', type, listener);
-
-	  } else if (isObject(list)) {
-	    for (i = length; i-- > 0;) {
-	      if (list[i] === listener ||
-	          (list[i].listener && list[i].listener === listener)) {
-	        position = i;
-	        break;
-	      }
-	    }
-
-	    if (position < 0)
-	      return this;
-
-	    if (list.length === 1) {
-	      list.length = 0;
-	      delete this._events[type];
-	    } else {
-	      list.splice(position, 1);
-	    }
-
-	    if (this._events.removeListener)
-	      this.emit('removeListener', type, listener);
-	  }
-
-	  return this;
-	};
-
-	EventEmitter.prototype.removeAllListeners = function(type) {
-	  var key, listeners;
-
-	  if (!this._events)
-	    return this;
-
-	  // not listening for removeListener, no need to emit
-	  if (!this._events.removeListener) {
-	    if (arguments.length === 0)
-	      this._events = {};
-	    else if (this._events[type])
-	      delete this._events[type];
-	    return this;
-	  }
-
-	  // emit removeListener for all listeners on all events
-	  if (arguments.length === 0) {
-	    for (key in this._events) {
-	      if (key === 'removeListener') continue;
-	      this.removeAllListeners(key);
-	    }
-	    this.removeAllListeners('removeListener');
-	    this._events = {};
-	    return this;
-	  }
-
-	  listeners = this._events[type];
-
-	  if (isFunction(listeners)) {
-	    this.removeListener(type, listeners);
-	  } else if (listeners) {
-	    // LIFO order
-	    while (listeners.length)
-	      this.removeListener(type, listeners[listeners.length - 1]);
-	  }
-	  delete this._events[type];
-
-	  return this;
-	};
-
-	EventEmitter.prototype.listeners = function(type) {
-	  var ret;
-	  if (!this._events || !this._events[type])
-	    ret = [];
-	  else if (isFunction(this._events[type]))
-	    ret = [this._events[type]];
-	  else
-	    ret = this._events[type].slice();
-	  return ret;
-	};
-
-	EventEmitter.prototype.listenerCount = function(type) {
-	  if (this._events) {
-	    var evlistener = this._events[type];
-
-	    if (isFunction(evlistener))
-	      return 1;
-	    else if (evlistener)
-	      return evlistener.length;
-	  }
-	  return 0;
-	};
-
-	EventEmitter.listenerCount = function(emitter, type) {
-	  return emitter.listenerCount(type);
-	};
-
-	function isFunction(arg) {
-	  return typeof arg === 'function';
-	}
-
-	function isNumber(arg) {
-	  return typeof arg === 'number';
-	}
-
-	function isObject(arg) {
-	  return typeof arg === 'object' && arg !== null;
-	}
-
-	function isUndefined(arg) {
-	  return arg === void 0;
-	}
-
-
-/***/ },
-/* 2 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(global, process) {// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	var formatRegExp = /%[sdj%]/g;
-	exports.format = function(f) {
-	  if (!isString(f)) {
-	    var objects = [];
-	    for (var i = 0; i < arguments.length; i++) {
-	      objects.push(inspect(arguments[i]));
-	    }
-	    return objects.join(' ');
-	  }
-
-	  var i = 1;
-	  var args = arguments;
-	  var len = args.length;
-	  var str = String(f).replace(formatRegExp, function(x) {
-	    if (x === '%%') return '%';
-	    if (i >= len) return x;
-	    switch (x) {
-	      case '%s': return String(args[i++]);
-	      case '%d': return Number(args[i++]);
-	      case '%j':
-	        try {
-	          return JSON.stringify(args[i++]);
-	        } catch (_) {
-	          return '[Circular]';
-	        }
-	      default:
-	        return x;
-	    }
-	  });
-	  for (var x = args[i]; i < len; x = args[++i]) {
-	    if (isNull(x) || !isObject(x)) {
-	      str += ' ' + x;
-	    } else {
-	      str += ' ' + inspect(x);
-	    }
-	  }
-	  return str;
-	};
-
-
-	// Mark that a method should not be used.
-	// Returns a modified function which warns once by default.
-	// If --no-deprecation is set, then it is a no-op.
-	exports.deprecate = function(fn, msg) {
-	  // Allow for deprecating things in the process of starting up.
-	  if (isUndefined(global.process)) {
-	    return function() {
-	      return exports.deprecate(fn, msg).apply(this, arguments);
-	    };
-	  }
-
-	  if (process.noDeprecation === true) {
-	    return fn;
-	  }
-
-	  var warned = false;
-	  function deprecated() {
-	    if (!warned) {
-	      if (process.throwDeprecation) {
-	        throw new Error(msg);
-	      } else if (process.traceDeprecation) {
-	        console.trace(msg);
-	      } else {
-	        console.error(msg);
-	      }
-	      warned = true;
-	    }
-	    return fn.apply(this, arguments);
-	  }
-
-	  return deprecated;
-	};
-
-
-	var debugs = {};
-	var debugEnviron;
-	exports.debuglog = function(set) {
-	  if (isUndefined(debugEnviron))
-	    debugEnviron = process.env.NODE_DEBUG || '';
-	  set = set.toUpperCase();
-	  if (!debugs[set]) {
-	    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
-	      var pid = process.pid;
-	      debugs[set] = function() {
-	        var msg = exports.format.apply(exports, arguments);
-	        console.error('%s %d: %s', set, pid, msg);
-	      };
-	    } else {
-	      debugs[set] = function() {};
-	    }
-	  }
-	  return debugs[set];
-	};
-
-
-	/**
-	 * Echos the value of a value. Trys to print the value out
-	 * in the best way possible given the different types.
-	 *
-	 * @param {Object} obj The object to print out.
-	 * @param {Object} opts Optional options object that alters the output.
-	 */
-	/* legacy: obj, showHidden, depth, colors*/
-	function inspect(obj, opts) {
-	  // default options
-	  var ctx = {
-	    seen: [],
-	    stylize: stylizeNoColor
-	  };
-	  // legacy...
-	  if (arguments.length >= 3) ctx.depth = arguments[2];
-	  if (arguments.length >= 4) ctx.colors = arguments[3];
-	  if (isBoolean(opts)) {
-	    // legacy...
-	    ctx.showHidden = opts;
-	  } else if (opts) {
-	    // got an "options" object
-	    exports._extend(ctx, opts);
-	  }
-	  // set default options
-	  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
-	  if (isUndefined(ctx.depth)) ctx.depth = 2;
-	  if (isUndefined(ctx.colors)) ctx.colors = false;
-	  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
-	  if (ctx.colors) ctx.stylize = stylizeWithColor;
-	  return formatValue(ctx, obj, ctx.depth);
-	}
-	exports.inspect = inspect;
-
-
-	// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
-	inspect.colors = {
-	  'bold' : [1, 22],
-	  'italic' : [3, 23],
-	  'underline' : [4, 24],
-	  'inverse' : [7, 27],
-	  'white' : [37, 39],
-	  'grey' : [90, 39],
-	  'black' : [30, 39],
-	  'blue' : [34, 39],
-	  'cyan' : [36, 39],
-	  'green' : [32, 39],
-	  'magenta' : [35, 39],
-	  'red' : [31, 39],
-	  'yellow' : [33, 39]
-	};
-
-	// Don't use 'blue' not visible on cmd.exe
-	inspect.styles = {
-	  'special': 'cyan',
-	  'number': 'yellow',
-	  'boolean': 'yellow',
-	  'undefined': 'grey',
-	  'null': 'bold',
-	  'string': 'green',
-	  'date': 'magenta',
-	  // "name": intentionally not styling
-	  'regexp': 'red'
-	};
-
-
-	function stylizeWithColor(str, styleType) {
-	  var style = inspect.styles[styleType];
-
-	  if (style) {
-	    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
-	           '\u001b[' + inspect.colors[style][1] + 'm';
-	  } else {
-	    return str;
-	  }
-	}
-
-
-	function stylizeNoColor(str, styleType) {
-	  return str;
-	}
-
-
-	function arrayToHash(array) {
-	  var hash = {};
-
-	  array.forEach(function(val, idx) {
-	    hash[val] = true;
-	  });
-
-	  return hash;
-	}
-
-
-	function formatValue(ctx, value, recurseTimes) {
-	  // Provide a hook for user-specified inspect functions.
-	  // Check that value is an object with an inspect function on it
-	  if (ctx.customInspect &&
-	      value &&
-	      isFunction(value.inspect) &&
-	      // Filter out the util module, it's inspect function is special
-	      value.inspect !== exports.inspect &&
-	      // Also filter out any prototype objects using the circular check.
-	      !(value.constructor && value.constructor.prototype === value)) {
-	    var ret = value.inspect(recurseTimes, ctx);
-	    if (!isString(ret)) {
-	      ret = formatValue(ctx, ret, recurseTimes);
-	    }
-	    return ret;
-	  }
-
-	  // Primitive types cannot have properties
-	  var primitive = formatPrimitive(ctx, value);
-	  if (primitive) {
-	    return primitive;
-	  }
-
-	  // Look up the keys of the object.
-	  var keys = Object.keys(value);
-	  var visibleKeys = arrayToHash(keys);
-
-	  if (ctx.showHidden) {
-	    keys = Object.getOwnPropertyNames(value);
-	  }
-
-	  // IE doesn't make error fields non-enumerable
-	  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
-	  if (isError(value)
-	      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
-	    return formatError(value);
-	  }
-
-	  // Some type of object without properties can be shortcutted.
-	  if (keys.length === 0) {
-	    if (isFunction(value)) {
-	      var name = value.name ? ': ' + value.name : '';
-	      return ctx.stylize('[Function' + name + ']', 'special');
-	    }
-	    if (isRegExp(value)) {
-	      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-	    }
-	    if (isDate(value)) {
-	      return ctx.stylize(Date.prototype.toString.call(value), 'date');
-	    }
-	    if (isError(value)) {
-	      return formatError(value);
-	    }
-	  }
-
-	  var base = '', array = false, braces = ['{', '}'];
-
-	  // Make Array say that they are Array
-	  if (isArray(value)) {
-	    array = true;
-	    braces = ['[', ']'];
-	  }
-
-	  // Make functions say that they are functions
-	  if (isFunction(value)) {
-	    var n = value.name ? ': ' + value.name : '';
-	    base = ' [Function' + n + ']';
-	  }
-
-	  // Make RegExps say that they are RegExps
-	  if (isRegExp(value)) {
-	    base = ' ' + RegExp.prototype.toString.call(value);
-	  }
-
-	  // Make dates with properties first say the date
-	  if (isDate(value)) {
-	    base = ' ' + Date.prototype.toUTCString.call(value);
-	  }
-
-	  // Make error with message first say the error
-	  if (isError(value)) {
-	    base = ' ' + formatError(value);
-	  }
-
-	  if (keys.length === 0 && (!array || value.length == 0)) {
-	    return braces[0] + base + braces[1];
-	  }
-
-	  if (recurseTimes < 0) {
-	    if (isRegExp(value)) {
-	      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-	    } else {
-	      return ctx.stylize('[Object]', 'special');
-	    }
-	  }
-
-	  ctx.seen.push(value);
-
-	  var output;
-	  if (array) {
-	    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
-	  } else {
-	    output = keys.map(function(key) {
-	      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
-	    });
-	  }
-
-	  ctx.seen.pop();
-
-	  return reduceToSingleString(output, base, braces);
-	}
-
-
-	function formatPrimitive(ctx, value) {
-	  if (isUndefined(value))
-	    return ctx.stylize('undefined', 'undefined');
-	  if (isString(value)) {
-	    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
-	                                             .replace(/'/g, "\\'")
-	                                             .replace(/\\"/g, '"') + '\'';
-	    return ctx.stylize(simple, 'string');
-	  }
-	  if (isNumber(value))
-	    return ctx.stylize('' + value, 'number');
-	  if (isBoolean(value))
-	    return ctx.stylize('' + value, 'boolean');
-	  // For some reason typeof null is "object", so special case here.
-	  if (isNull(value))
-	    return ctx.stylize('null', 'null');
-	}
-
-
-	function formatError(value) {
-	  return '[' + Error.prototype.toString.call(value) + ']';
-	}
-
-
-	function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
-	  var output = [];
-	  for (var i = 0, l = value.length; i < l; ++i) {
-	    if (hasOwnProperty(value, String(i))) {
-	      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-	          String(i), true));
-	    } else {
-	      output.push('');
-	    }
-	  }
-	  keys.forEach(function(key) {
-	    if (!key.match(/^\d+$/)) {
-	      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-	          key, true));
-	    }
-	  });
-	  return output;
-	}
-
-
-	function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
-	  var name, str, desc;
-	  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
-	  if (desc.get) {
-	    if (desc.set) {
-	      str = ctx.stylize('[Getter/Setter]', 'special');
-	    } else {
-	      str = ctx.stylize('[Getter]', 'special');
-	    }
-	  } else {
-	    if (desc.set) {
-	      str = ctx.stylize('[Setter]', 'special');
-	    }
-	  }
-	  if (!hasOwnProperty(visibleKeys, key)) {
-	    name = '[' + key + ']';
-	  }
-	  if (!str) {
-	    if (ctx.seen.indexOf(desc.value) < 0) {
-	      if (isNull(recurseTimes)) {
-	        str = formatValue(ctx, desc.value, null);
-	      } else {
-	        str = formatValue(ctx, desc.value, recurseTimes - 1);
-	      }
-	      if (str.indexOf('\n') > -1) {
-	        if (array) {
-	          str = str.split('\n').map(function(line) {
-	            return '  ' + line;
-	          }).join('\n').substr(2);
-	        } else {
-	          str = '\n' + str.split('\n').map(function(line) {
-	            return '   ' + line;
-	          }).join('\n');
-	        }
-	      }
-	    } else {
-	      str = ctx.stylize('[Circular]', 'special');
-	    }
-	  }
-	  if (isUndefined(name)) {
-	    if (array && key.match(/^\d+$/)) {
-	      return str;
-	    }
-	    name = JSON.stringify('' + key);
-	    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
-	      name = name.substr(1, name.length - 2);
-	      name = ctx.stylize(name, 'name');
-	    } else {
-	      name = name.replace(/'/g, "\\'")
-	                 .replace(/\\"/g, '"')
-	                 .replace(/(^"|"$)/g, "'");
-	      name = ctx.stylize(name, 'string');
-	    }
-	  }
-
-	  return name + ': ' + str;
-	}
-
-
-	function reduceToSingleString(output, base, braces) {
-	  var numLinesEst = 0;
-	  var length = output.reduce(function(prev, cur) {
-	    numLinesEst++;
-	    if (cur.indexOf('\n') >= 0) numLinesEst++;
-	    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
-	  }, 0);
-
-	  if (length > 60) {
-	    return braces[0] +
-	           (base === '' ? '' : base + '\n ') +
-	           ' ' +
-	           output.join(',\n  ') +
-	           ' ' +
-	           braces[1];
-	  }
-
-	  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
-	}
-
-
-	// NOTE: These type checking functions intentionally don't use `instanceof`
-	// because it is fragile and can be easily faked with `Object.create()`.
-	function isArray(ar) {
-	  return Array.isArray(ar);
-	}
-	exports.isArray = isArray;
-
-	function isBoolean(arg) {
-	  return typeof arg === 'boolean';
-	}
-	exports.isBoolean = isBoolean;
-
-	function isNull(arg) {
-	  return arg === null;
-	}
-	exports.isNull = isNull;
-
-	function isNullOrUndefined(arg) {
-	  return arg == null;
-	}
-	exports.isNullOrUndefined = isNullOrUndefined;
-
-	function isNumber(arg) {
-	  return typeof arg === 'number';
-	}
-	exports.isNumber = isNumber;
-
-	function isString(arg) {
-	  return typeof arg === 'string';
-	}
-	exports.isString = isString;
-
-	function isSymbol(arg) {
-	  return typeof arg === 'symbol';
-	}
-	exports.isSymbol = isSymbol;
-
-	function isUndefined(arg) {
-	  return arg === void 0;
-	}
-	exports.isUndefined = isUndefined;
-
-	function isRegExp(re) {
-	  return isObject(re) && objectToString(re) === '[object RegExp]';
-	}
-	exports.isRegExp = isRegExp;
-
-	function isObject(arg) {
-	  return typeof arg === 'object' && arg !== null;
-	}
-	exports.isObject = isObject;
-
-	function isDate(d) {
-	  return isObject(d) && objectToString(d) === '[object Date]';
-	}
-	exports.isDate = isDate;
-
-	function isError(e) {
-	  return isObject(e) &&
-	      (objectToString(e) === '[object Error]' || e instanceof Error);
-	}
-	exports.isError = isError;
-
-	function isFunction(arg) {
-	  return typeof arg === 'function';
-	}
-	exports.isFunction = isFunction;
-
-	function isPrimitive(arg) {
-	  return arg === null ||
-	         typeof arg === 'boolean' ||
-	         typeof arg === 'number' ||
-	         typeof arg === 'string' ||
-	         typeof arg === 'symbol' ||  // ES6 symbol
-	         typeof arg === 'undefined';
-	}
-	exports.isPrimitive = isPrimitive;
-
-	exports.isBuffer = __webpack_require__(4);
-
-	function objectToString(o) {
-	  return Object.prototype.toString.call(o);
-	}
-
-
-	function pad(n) {
-	  return n < 10 ? '0' + n.toString(10) : n.toString(10);
-	}
-
-
-	var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
-	              'Oct', 'Nov', 'Dec'];
-
-	// 26 Feb 16:19:34
-	function timestamp() {
-	  var d = new Date();
-	  var time = [pad(d.getHours()),
-	              pad(d.getMinutes()),
-	              pad(d.getSeconds())].join(':');
-	  return [d.getDate(), months[d.getMonth()], time].join(' ');
-	}
-
-
-	// log is just a thin wrapper to console.log that prepends a timestamp
-	exports.log = function() {
-	  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
-	};
-
-
-	/**
-	 * Inherit the prototype methods from one constructor into another.
-	 *
-	 * The Function.prototype.inherits from lang.js rewritten as a standalone
-	 * function (not on Function.prototype). NOTE: If this file is to be loaded
-	 * during bootstrapping this function needs to be rewritten using some native
-	 * functions as prototype setup using normal JavaScript does not work as
-	 * expected during bootstrapping (see mirror.js in r114903).
-	 *
-	 * @param {function} ctor Constructor function which needs to inherit the
-	 *     prototype.
-	 * @param {function} superCtor Constructor function to inherit prototype from.
-	 */
-	exports.inherits = __webpack_require__(5);
-
-	exports._extend = function(origin, add) {
-	  // Don't do anything if add isn't an object
-	  if (!add || !isObject(add)) return origin;
-
-	  var keys = Object.keys(add);
-	  var i = keys.length;
-	  while (i--) {
-	    origin[keys[i]] = add[keys[i]];
-	  }
-	  return origin;
-	};
-
-	function hasOwnProperty(obj, prop) {
-	  return Object.prototype.hasOwnProperty.call(obj, prop);
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }()), __webpack_require__(3)))
-
-/***/ },
-/* 3 */
-/***/ function(module, exports) {
-
-	// shim for using process in browser
-
-	var process = module.exports = {};
-	var queue = [];
-	var draining = false;
-	var currentQueue;
-	var queueIndex = -1;
-
-	function cleanUpNextTick() {
-	    draining = false;
-	    if (currentQueue.length) {
-	        queue = currentQueue.concat(queue);
-	    } else {
-	        queueIndex = -1;
-	    }
-	    if (queue.length) {
-	        drainQueue();
-	    }
-	}
-
-	function drainQueue() {
-	    if (draining) {
-	        return;
-	    }
-	    var timeout = setTimeout(cleanUpNextTick);
-	    draining = true;
-
-	    var len = queue.length;
-	    while(len) {
-	        currentQueue = queue;
-	        queue = [];
-	        while (++queueIndex < len) {
-	            if (currentQueue) {
-	                currentQueue[queueIndex].run();
-	            }
-	        }
-	        queueIndex = -1;
-	        len = queue.length;
-	    }
-	    currentQueue = null;
-	    draining = false;
-	    clearTimeout(timeout);
-	}
-
-	process.nextTick = function (fun) {
-	    var args = new Array(arguments.length - 1);
-	    if (arguments.length > 1) {
-	        for (var i = 1; i < arguments.length; i++) {
-	            args[i - 1] = arguments[i];
-	        }
-	    }
-	    queue.push(new Item(fun, args));
-	    if (queue.length === 1 && !draining) {
-	        setTimeout(drainQueue, 0);
-	    }
-	};
-
-	// v8 likes predictible objects
-	function Item(fun, array) {
-	    this.fun = fun;
-	    this.array = array;
-	}
-	Item.prototype.run = function () {
-	    this.fun.apply(null, this.array);
-	};
-	process.title = 'browser';
-	process.browser = true;
-	process.env = {};
-	process.argv = [];
-	process.version = ''; // empty string to avoid regexp issues
-	process.versions = {};
-
-	function noop() {}
-
-	process.on = noop;
-	process.addListener = noop;
-	process.once = noop;
-	process.off = noop;
-	process.removeListener = noop;
-	process.removeAllListeners = noop;
-	process.emit = noop;
-
-	process.binding = function (name) {
-	    throw new Error('process.binding is not supported');
-	};
-
-	process.cwd = function () { return '/' };
-	process.chdir = function (dir) {
-	    throw new Error('process.chdir is not supported');
-	};
-	process.umask = function() { return 0; };
-
-
-/***/ },
-/* 4 */
-/***/ function(module, exports) {
-
-	module.exports = function isBuffer(arg) {
-	  return arg && typeof arg === 'object'
-	    && typeof arg.copy === 'function'
-	    && typeof arg.fill === 'function'
-	    && typeof arg.readUInt8 === 'function';
-	}
-
-/***/ },
-/* 5 */
-/***/ function(module, exports) {
-
-	if (typeof Object.create === 'function') {
-	  // implementation from standard node.js 'util' module
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    ctor.prototype = Object.create(superCtor.prototype, {
-	      constructor: {
-	        value: ctor,
-	        enumerable: false,
-	        writable: true,
-	        configurable: true
-	      }
-	    });
-	  };
-	} else {
-	  // old school shim for old browsers
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    var TempCtor = function () {}
-	    TempCtor.prototype = superCtor.prototype
-	    ctor.prototype = new TempCtor()
-	    ctor.prototype.constructor = ctor
-	  }
-	}
-
-
-/***/ },
-/* 6 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var EventEmitter = __webpack_require__(1);
-	var Sequencer = __webpack_require__(7);
-	var Thread = __webpack_require__(9);
-	var util = __webpack_require__(2);
-
-	var defaultBlockPackages = {
-	    'scratch3': __webpack_require__(11),
-	    'wedo2': __webpack_require__(12)
-	};
-
-	/**
-	 * Manages blocks, stacks, and the sequencer.
-	 */
-	function Runtime () {
-	    // Bind event emitter
-	    EventEmitter.call(this);
-
-	    // State for the runtime
-	    /**
-	     * All blocks in the workspace.
-	     * Keys are block IDs, values are metadata about the block.
-	     * @type {Object.<string, Object>}
-	     */
-	    this.blocks = {};
-
-	    /**
-	     * All stacks in the workspace.
-	     * A list of block IDs that represent stacks (first block in stack).
-	     * @type {Array.<String>}
-	     */
-	    this.stacks = [];
-
-	    /**
-	     * A list of threads that are currently running in the VM.
-	     * Threads are added when execution starts and pruned when execution ends.
-	     * @type {Array.<Thread>}
-	     */
-	    this.threads = [];
-
-	    /** @type {!Sequencer} */
-	    this.sequencer = new Sequencer(this);
-
-	    /**
-	     * Map to look up a block primitive's implementation function by its opcode.
-	     * This is a two-step lookup: package name first, then primitive name.
-	     * @type {Object.<string, Function>}
-	     */
-	    this._primitives = {};
-	    this._registerBlockPackages();
-	}
-
-	/**
-	 * Event name for glowing a stack
-	 * @const {string}
-	 */
-	Runtime.STACK_GLOW_ON = 'STACK_GLOW_ON';
-
-	/**
-	 * Event name for unglowing a stack
-	 * @const {string}
-	 */
-	Runtime.STACK_GLOW_OFF = 'STACK_GLOW_OFF';
-
-	/**
-	 * Event name for glowing a block
-	 * @const {string}
-	 */
-	Runtime.BLOCK_GLOW_ON = 'BLOCK_GLOW_ON';
-
-	/**
-	 * Event name for unglowing a block
-	 * @const {string}
-	 */
-	Runtime.BLOCK_GLOW_OFF = 'BLOCK_GLOW_OFF';
-
-	/**
-	 * Inherit from EventEmitter
-	 */
-	util.inherits(Runtime, EventEmitter);
-
-	/**
-	 * How rapidly we try to step threads, in ms.
-	 */
-	Runtime.THREAD_STEP_INTERVAL = 1000 / 30;
-
-	/**
-	 * Block management: create blocks and stacks from a `create` event
-	 * @param {!Object} block Blockly create event to be processed
-	 */
-	Runtime.prototype.createBlock = function (block, opt_isFlyoutBlock) {
-	    // Create new block
-	    this.blocks[block.id] = block;
-
-	    // Walk each field and add any shadow blocks
-	    // @todo Expand this to cover vertical / nested blocks
-	    for (var i in block.fields) {
-	        var shadows = block.fields[i].blocks;
-	        for (var y in shadows) {
-	            var shadow = shadows[y];
-	            this.blocks[shadow.id] = shadow;
-	        }
-	    }
-
-	    // Push block id to stacks array. New blocks are always a stack even if only
-	    // momentary. If the new block is added to an existing stack this stack will
-	    // be removed by the `moveBlock` method below.
-	    if (!opt_isFlyoutBlock) {
-	        this.stacks.push(block.id);
-	    }
-	};
-
-	/**
-	 * Block management: change block field values
-	 * @param {!Object} args Blockly change event to be processed
-	 */
-	Runtime.prototype.changeBlock = function (args) {
-	    // Validate
-	    if (args.element !== 'field') return;
-	    if (typeof this.blocks[args.id] === 'undefined') return;
-	    if (typeof this.blocks[args.id].fields[args.name] === 'undefined') return;
-
-	    // Update block value
-	    this.blocks[args.id].fields[args.name].value = args.value;
-	};
-
-	/**
-	 * Block management: move blocks from parent to parent
-	 * @param {!Object} e Blockly move event to be processed
-	 */
-	Runtime.prototype.moveBlock = function (e) {
-	    var _this = this;
-
-	    // Block was removed from parent
-	    if (e.newParent === undefined && e.oldParent !== undefined) {
-	        // Add stack
-	        _this.stacks.push(e.id);
-
-	        // Update old parent
-	        if (e.oldField === undefined) {
-	            _this.blocks[e.oldParent].next = null;
-	        } else {
-	            delete _this.blocks[e.oldParent].fields[e.oldField];
-	        }
-	    } else if (e.newParent !== undefined) {
-	        // Block was moved to a new parent
-	        // Either happens because it was previously parentless
-	        // (e.oldParent === undefined)
-	        // or because a block was moved in front of it.
-
-	        // Remove stack
-	        _this._deleteStack(e.id);
-
-	        // Update new parent
-	        if (e.newField === undefined) {
-	            _this.blocks[e.newParent].next = e.id;
-	        } else {
-	            _this.blocks[e.newParent].fields[e.newField] = {
-	                name: e.newField,
-	                value: e.id,
-	                blocks: {}
-	            };
-	        }
-	    }
-	};
-
-	/**
-	 * Block management: delete blocks and their associated stacks
-	 * @param {!Object} e Blockly delete event to be processed
-	 */
-	Runtime.prototype.deleteBlock = function (e) {
-	    // @todo Stop threads running on this stack
-
-	    // Get block
-	    var block = this.blocks[e.id];
-
-	    // Delete children
-	    if (block.next !== null) {
-	        this.deleteBlock({id: block.next});
-	    }
-
-	    // Delete substacks and fields
-	    for (var field in block.fields) {
-	        if (field === 'SUBSTACK') {
-	            this.deleteBlock({id: block.fields[field].value});
-	        } else {
-	            for (var shadow in block.fields[field].blocks) {
-	                this.deleteBlock({id: shadow});
-	            }
-	        }
-	    }
-
-	    // Delete stack
-	    this._deleteStack(e.id);
-
-	    // Delete block
-	    delete this.blocks[e.id];
-	};
-
-	// -----------------------------------------------------------------------------
-	// -----------------------------------------------------------------------------
-
-	/**
-	 * Register default block packages with this runtime.
-	 * @todo Prefix opcodes with package name.
-	 * @private
-	 */
-	Runtime.prototype._registerBlockPackages = function () {
-	    for (var packageName in defaultBlockPackages) {
-	        if (defaultBlockPackages.hasOwnProperty(packageName)) {
-	            // @todo pass a different runtime depending on package privilege?
-	            var packageObject = new (defaultBlockPackages[packageName])(this);
-	            var packageContents = packageObject.getPrimitives();
-	            for (var op in packageContents) {
-	                if (packageContents.hasOwnProperty(op)) {
-	                    this._primitives[op] =
-	                        packageContents[op].bind(packageObject);
-	                }
-	            }
-	        }
-	    }
-	};
-
-	/**
-	 * Retrieve the function associated with the given opcode.
-	 * @param {!string} opcode The opcode to look up.
-	 * @return {Function} The function which implements the opcode.
-	 */
-	Runtime.prototype.getOpcodeFunction = function (opcode) {
-	    return this._primitives[opcode];
-	};
-
-	// -----------------------------------------------------------------------------
-	// -----------------------------------------------------------------------------
-
-	/**
-	 * Create a thread and push it to the list of threads.
-	 * @param {!string} id ID of block that starts the stack
-	 */
-	Runtime.prototype._pushThread = function (id) {
-	    this.emit(Runtime.STACK_GLOW_ON, id);
-	    var thread = new Thread(id);
-	    this.threads.push(thread);
-	};
-
-	/**
-	 * Remove a thread from the list of threads.
-	 * @param {?Thread} thread Thread object to remove from actives
-	 */
-	Runtime.prototype._removeThread = function (thread) {
-	    var i = this.threads.indexOf(thread);
-	    if (i > -1) {
-	        this.emit(Runtime.STACK_GLOW_OFF, thread.topBlock);
-	        this.threads.splice(i, 1);
-	    }
-	};
-
-	/**
-	 * Toggle a stack
-	 * @param {!string} stackId ID of block that starts the stack
-	 */
-	Runtime.prototype.toggleStack = function (stackId) {
-	    // Remove any existing thread
-	    for (var i = 0; i < this.threads.length; i++) {
-	        if (this.threads[i].topBlock == stackId) {
-	            this._removeThread(this.threads[i]);
-	            return;
-	        }
-	    }
-	    // Otherwise add it
-	    this._pushThread(stackId);
-	};
-
-	/**
-	 * Green flag, which stops currently running threads
-	 * and adds all top-level stacks that start with the green flag
-	 */
-	Runtime.prototype.greenFlag = function () {
-	    // Remove all existing threads
-	    for (var i = 0; i < this.threads.length; i++) {
-	        this._removeThread(this.threads[i]);
-	    }
-	    // Add all top stacks with green flag
-	    for (var j = 0; j < this.stacks.length; j++) {
-	        var topBlock = this.stacks[j];
-	        if (this.blocks[topBlock].opcode === 'event_whenflagclicked') {
-	            this._pushThread(this.stacks[j]);
-	        }
-	    }
-	};
-
-	/**
-	 * Distance sensor hack
-	 */
-	Runtime.prototype.startDistanceSensors = function () {
-	    // Add all top stacks with distance sensor
-	    for (var j = 0; j < this.stacks.length; j++) {
-	        var topBlock = this.stacks[j];
-	        if (this.blocks[topBlock].opcode === 'wedo_whendistanceclose') {
-	            var alreadyRunning = false;
-	            for (var k = 0; k < this.threads.length; k++) {
-	                if (this.threads[k].topBlock === topBlock) {
-	                    alreadyRunning = true;
-	                }
-	            }
-	            if (!alreadyRunning) {
-	                this._pushThread(this.stacks[j]);
-	            }
-	        }
-	    }
-	};
-
-	/**
-	 * Stop "everything"
-	 */
-	Runtime.prototype.stopAll = function () {
-	    var threadsCopy = this.threads.slice();
-	    while (threadsCopy.length > 0) {
-	        this._removeThread(threadsCopy.pop());
-	    }
-	    // @todo call stop function in all extensions/packages/WeDo stub
-	    if (window.native) {
-	        window.native.motorStop();
-	    }
-	};
-
-	/**
-	 * Repeatedly run `sequencer.stepThreads` and filter out
-	 * inactive threads after each iteration.
-	 */
-	Runtime.prototype._step = function () {
-	    var inactiveThreads = this.sequencer.stepThreads(this.threads);
-	    for (var i = 0; i < inactiveThreads.length; i++) {
-	        this._removeThread(inactiveThreads[i]);
-	    }
-	};
-
-	/**
-	 * Emit feedback for block glowing (used in the sequencer).
-	 * @param {?string} blockId ID for the block to update glow
-	 * @param {boolean} isGlowing True to turn on glow; false to turn off.
-	 */
-	Runtime.prototype.glowBlock = function (blockId, isGlowing) {
-	    if (isGlowing) {
-	        this.emit(Runtime.BLOCK_GLOW_ON, blockId);
-	    } else {
-	        this.emit(Runtime.BLOCK_GLOW_OFF, blockId);
-	    }
-	};
-
-	/**
-	 * Set up timers to repeatedly step in a browser
-	 */
-	Runtime.prototype.start = function () {
-	    if (!window.setInterval) return;
-	    window.setInterval(function() {
-	        this._step();
-	    }.bind(this), Runtime.THREAD_STEP_INTERVAL);
-	};
-
-	// -----------------------------------------------------------------------------
-	// -----------------------------------------------------------------------------
-
-	/**
-	 * Helper to remove a stack from `this.stacks`
-	 * @param {?string} id ID of block that starts the stack
-	 */
-	Runtime.prototype._deleteStack = function (id) {
-	    var i = this.stacks.indexOf(id);
-	    if (i > -1) this.stacks.splice(i, 1);
-	};
-
-	/**
-	 * Helper to get the next block for a particular block
-	 * @param {?string} id ID of block to get the next block for
-	 * @return {?string} ID of next block in the sequence
-	 */
-	Runtime.prototype._getNextBlock = function (id) {
-	    if (typeof this.blocks[id] === 'undefined') return null;
-	    return this.blocks[id].next;
-	};
-
-	/**
-	 * Helper to get the substack for a particular C-shaped block
-	 * @param {?string} id ID for block to get the substack for
-	 * @return {?string} ID of block in the substack
-	 */
-	Runtime.prototype._getSubstack = function (id) {
-	    if (typeof this.blocks[id] === 'undefined') return null;
-	    return this.blocks[id].fields['SUBSTACK'];
-	};
-
-	/**
-	 * Helper to get the opcode for a particular block
-	 * @param {?string} id ID of block to query
-	 * @return {?string} the opcode corresponding to that block
-	 */
-	Runtime.prototype._getOpcode = function (id) {
-	    if (typeof this.blocks[id] === 'undefined') return null;
-	    return this.blocks[id].opcode;
-	};
-
-	module.exports = Runtime;
-
-
-/***/ },
-/* 7 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Timer = __webpack_require__(8);
-	var Thread = __webpack_require__(9);
-	var YieldTimers = __webpack_require__(10);
-
-	function Sequencer (runtime) {
-	    /**
-	     * A utility timer for timing thread sequencing.
-	     * @type {!Timer}
-	     */
-	    this.timer = new Timer();
-
-	    /**
-	     * Reference to the runtime owning this sequencer.
-	     * @type {!Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
-	/**
-	 * The sequencer does as much work as it can within WORK_TIME milliseconds,
-	 * then yields. This is essentially a rate-limiter for blocks.
-	 * In Scratch 2.0, this is set to 75% of the target stage frame-rate (30fps).
-	 * @const {!number}
-	 */
-	Sequencer.WORK_TIME = 10;
-
-	/**
-	 * Step through all threads in `this.threads`, running them in order.
-	 * @return {Array.<Thread>} All threads which have finished in this iteration.
-	 */
-	Sequencer.prototype.stepThreads = function (threads) {
-	    // Start counting toward WORK_TIME
-	    this.timer.start();
-	    // List of threads which have been killed by this step.
-	    var inactiveThreads = [];
-	    // If all of the threads are yielding, we should yield.
-	    var numYieldingThreads = 0;
-	    // While there are still threads to run and we are within WORK_TIME,
-	    // continue executing threads.
-	    while (threads.length > 0 &&
-	           threads.length > numYieldingThreads &&
-	           this.timer.timeElapsed() < Sequencer.WORK_TIME) {
-	        // New threads at the end of the iteration.
-	        var newThreads = [];
-	        // Attempt to run each thread one time
-	        for (var i = 0; i < threads.length; i++) {
-	            var activeThread = threads[i];
-	            if (activeThread.status === Thread.STATUS_RUNNING) {
-	                // Normal-mode thread: step.
-	                this.stepThread(activeThread);
-	            } else if (activeThread.status === Thread.STATUS_YIELD) {
-	                // Yield-mode thread: check if the time has passed.
-	                YieldTimers.resolve(activeThread.yieldTimerId);
-	                numYieldingThreads++;
-	            } else if (activeThread.status === Thread.STATUS_DONE) {
-	                // Moved to a done state - finish up
-	                activeThread.status = Thread.STATUS_RUNNING;
-	                // @todo Deal with the return value
-	            }
-	            // First attempt to pop from the stack
-	            if (activeThread.stack.length > 0 &&
-	                activeThread.nextBlock === null &&
-	                activeThread.status === Thread.STATUS_DONE) {
-	                activeThread.nextBlock = activeThread.stack.pop();
-	                // Don't pop stack frame - we need the data.
-	                // A new one won't be created when we execute.
-	                if (activeThread.nextBlock !== null) {
-	                    activeThread.status === Thread.STATUS_RUNNING;
-	                }
-	            }
-	            if (activeThread.nextBlock === null &&
-	                activeThread.status === Thread.STATUS_DONE) {
-	                // Finished with this thread - tell runtime to clean it up.
-	                inactiveThreads.push(activeThread);
-	            } else {
-	                // Keep this thead in the loop.
-	                newThreads.push(activeThread);
-	            }
-	        }
-	        // Effectively filters out threads that have stopped.
-	        threads = newThreads;
-	    }
-	    return inactiveThreads;
-	};
-
-	/**
-	 * Step the requested thread
-	 * @param {!Thread} thread Thread object to step
-	 */
-	Sequencer.prototype.stepThread = function (thread) {
-	    // Save the yield timer ID, in case a primitive makes a new one
-	    // @todo hack - perhaps patch this to allow more than one timer per
-	    // primitive, for example...
-	    var oldYieldTimerId = YieldTimers.timerId;
-
-	    // Save the current block and set the nextBlock.
-	    // If the primitive would like to do control flow,
-	    // it can overwrite nextBlock.
-	    var currentBlock = thread.nextBlock;
-	    if (!currentBlock || !this.runtime.blocks[currentBlock]) {
-	        thread.status = Thread.STATUS_DONE;
-	        return;
-	    }
-	    thread.nextBlock = this.runtime._getNextBlock(currentBlock);
-
-	    var opcode = this.runtime._getOpcode(currentBlock);
-
-	    // Push the current block to the stack
-	    thread.stack.push(currentBlock);
-	    // Push an empty stack frame, if we need one.
-	    // Might not, if we just popped the stack.
-	    if (thread.stack.length > thread.stackFrames.length) {
-	        thread.stackFrames.push({});
-	    }
-	    var currentStackFrame = thread.stackFrames[thread.stackFrames.length - 1];
-
-	    /**
-	     * A callback for the primitive to indicate its thread should yield.
-	     * @type {Function}
-	     */
-	    var threadYieldCallback = function () {
-	        thread.status = Thread.STATUS_YIELD;
-	    };
-
-	    /**
-	     * A callback for the primitive to indicate its thread is finished
-	     * @type {Function}
-	     */
-	    var instance = this;
-	    var threadDoneCallback = function () {
-	        thread.status = Thread.STATUS_DONE;
-	        // Refresh nextBlock in case it has changed during a yield.
-	        thread.nextBlock = instance.runtime._getNextBlock(currentBlock);
-	        // Pop the stack and stack frame
-	        thread.stack.pop();
-	        thread.stackFrames.pop();
-	    };
-
-	    /**
-	     * A callback for the primitive to start hats.
-	     * @todo very hacked...
-	     */
-	    var startHats = function(callback) {
-	        for (var i = 0; i < instance.runtime.stacks.length; i++) {
-	            var stack = instance.runtime.stacks[i];
-	            var stackBlock = instance.runtime.blocks[stack];
-	            var result = callback(stackBlock);
-	            if (result) {
-	                // Check if the stack is already running
-	                var stackRunning = false;
-
-	                for (var j = 0; j < instance.runtime.threads.length; j++) {
-	                    if (instance.runtime.threads[j].topBlock == stack) {
-	                        stackRunning = true;
-	                        break;
-	                    }
-	                }
-	                if (!stackRunning) {
-	                    instance.runtime._pushThread(stack);
-	                }
-	            }
-	        }
-	    };
-
-	    /**
-	     * Record whether we have switched stack,
-	     * to avoid proceeding the thread automatically.
-	     * @type {boolean}
-	     */
-	    var switchedStack = false;
-	    /**
-	     * A callback for a primitive to start a substack.
-	     * @type {Function}
-	     */
-	    var threadStartSubstack = function () {
-	        // Set nextBlock to the start of the substack
-	        var substack = instance.runtime._getSubstack(currentBlock);
-	        if (substack && substack.value) {
-	            thread.nextBlock = substack.value;
-	        } else {
-	            thread.nextBlock = null;
-	        }
-	        switchedStack = true;
-	    };
-
-	    // @todo extreme hack to get the single argument value for prototype
-	    var argValues = [];
-	    var blockInputs = this.runtime.blocks[currentBlock].fields;
-	    for (var bi in blockInputs) {
-	        var outer = blockInputs[bi];
-	        for (var b in outer.blocks) {
-	            var block = outer.blocks[b];
-	            var fields = block.fields;
-	            for (var f in fields) {
-	                var field = fields[f];
-	                argValues.push(field.value);
-	            }
-	        }
-	    }
-
-	    if (!opcode) {
-	        console.warn('Could not get opcode for block: ' + currentBlock);
-	    }
-	    else {
-	        var blockFunction = this.runtime.getOpcodeFunction(opcode);
-	        if (!blockFunction) {
-	            console.warn('Could not get implementation for opcode: ' + opcode);
-	        }
-	        else {
-	            try {
-	                // @todo deal with the return value
-	                blockFunction(argValues, {
-	                    yield: threadYieldCallback,
-	                    done: threadDoneCallback,
-	                    timeout: YieldTimers.timeout,
-	                    stackFrame: currentStackFrame,
-	                    startSubstack: threadStartSubstack,
-	                    startHats: startHats
-	                });
-	            }
-	            catch(e) {
-	                console.error(
-	                    'Exception calling block function for opcode: ' +
-	                    opcode + '\n' + e);
-	            } finally {
-	                // Update if the thread has set a yield timer ID
-	                // @todo hack
-	                if (YieldTimers.timerId > oldYieldTimerId) {
-	                    thread.yieldTimerId = YieldTimers.timerId;
-	                }
-	                if (thread.status === Thread.STATUS_RUNNING && !switchedStack) {
-	                    // Thread executed without yielding - move to done
-	                    threadDoneCallback();
-	                }
-	            }
-	        }
-	    }
-
-	};
-
-	module.exports = Sequencer;
-
-
-/***/ },
-/* 8 */
-/***/ function(module, exports) {
-
-	/**
-	 * Constructor
-	 */
-	function Timer () {
-	    this.startTime = 0;
-	}
-
-	Timer.prototype.time = function () {
-	    return Date.now();
-	};
-
-	Timer.prototype.start = function () {
-	    this.startTime = this.time();
-	};
-
-	Timer.prototype.timeElapsed = function () {
-	    return this.time() - this.startTime;
-	};
-
-	module.exports = Timer;
-
-
-/***/ },
-/* 9 */
-/***/ function(module, exports) {
-
-	/**
-	 * A thread is a running stack context and all the metadata needed.
-	 * @param {?string} firstBlock First block to execute in the thread.
-	 * @constructor
-	 */
-	function Thread (firstBlock) {
-	    /**
-	     * ID of top block of the thread
-	     * @type {!string}
-	     */
-	    this.topBlock = firstBlock;
-	    /**
-	     * ID of next block that the thread will execute, or null if none.
-	     * @type {?string}
-	     */
-	    this.nextBlock = firstBlock;
-	    /**
-	     * Stack for the thread. When the sequencer enters a control structure,
-	     * the block is pushed onto the stack so we know where to exit.
-	     * @type {Array.<string>}
-	     */
-	    this.stack = [];
-
-	    /**
-	     * Stack frames for the thread. Store metadata for the executing blocks.
-	     * @type {Array.<Object>}
-	     */
-	    this.stackFrames = [];
-
-	    /**
-	     * Status of the thread, one of three states (below)
-	     * @type {number}
-	     */
-	    this.status = 0; /* Thread.STATUS_RUNNING */
-
-	    /**
-	     * Yield timer ID (for checking when the thread should unyield).
-	     * @type {number}
-	     */
-	    this.yieldTimerId = -1;
-	}
-
-	/**
-	 * Thread status for initialized or running thread.
-	 * Threads are in this state when the primitive is called for the first time.
-	 * @const
-	 */
-	Thread.STATUS_RUNNING = 0;
-
-	/**
-	 * Thread status for a yielded thread.
-	 * Threads are in this state when a primitive has yielded.
-	 * @const
-	 */
-	Thread.STATUS_YIELD = 1;
-
-	/**
-	 * Thread status for a finished/done thread.
-	 * Thread is moved to this state when the interpreter
-	 * can proceed with execution.
-	 * @const
-	 */
-	Thread.STATUS_DONE = 2;
-
-	module.exports = Thread;
-
-
-/***/ },
-/* 10 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/**
-	 * @fileoverview Timers that are synchronized with the Scratch sequencer.
-	 */
-	var Timer = __webpack_require__(8);
-
-	function YieldTimers () {}
-
-	/**
-	 * Shared collection of timers.
-	 * Each timer is a [Function, number] with the callback
-	 * and absolute time for it to run.
-	 * @type {Object.<number,Array>}
-	 */
-	YieldTimers.timers = {};
-
-	/**
-	 * Monotonically increasing timer ID.
-	 * @type {number}
-	 */
-	YieldTimers.timerId = 0;
-
-	/**
-	 * Utility for measuring time.
-	 * @type {!Timer}
-	 */
-	YieldTimers.globalTimer = new Timer();
-
-	/**
-	 * The timeout function is passed to primitives and is intended
-	 * as a convenient replacement for window.setTimeout.
-	 * The sequencer will attempt to resolve the timer every time
-	 * the yielded thread would have been stepped.
-	 * @param {!Function} callback To be called when the timer is done.
-	 * @param {number} timeDelta Time to wait, in ms.
-	 * @return {number} Timer ID to be used with other methods.
-	 */
-	YieldTimers.timeout = function (callback, timeDelta) {
-	    var id = ++YieldTimers.timerId;
-	    YieldTimers.timers[id] = [
-	        callback,
-	        YieldTimers.globalTimer.time() + timeDelta
-	    ];
-	    return id;
-	};
-
-	/**
-	 * Attempt to resolve a timeout.
-	 * If the time has passed, call the callback.
-	 * Otherwise, do nothing.
-	 * @param {number} id Timer ID to resolve.
-	 * @return {boolean} True if the timer has resolved.
-	 */
-	YieldTimers.resolve = function (id) {
-	    var timer = YieldTimers.timers[id];
-	    if (!timer) {
-	        // No such timer.
-	        return false;
-	    }
-	    var callback = timer[0];
-	    var time = timer[1];
-	    if (YieldTimers.globalTimer.time() < time) {
-	        // Not done yet.
-	        return false;
-	    }
-	    // Execute the callback and remove the timer.
-	    callback();
-	    delete YieldTimers.timers[id];
-	    return true;
-	};
-
-	/**
-	 * Reject a timer so the callback never executes.
-	 * @param {number} id Timer ID to reject.
-	 */
-	YieldTimers.reject = function (id) {
-	    if (YieldTimers.timers[id]) {
-	        delete YieldTimers.timers[id];
-	    }
-	};
-
-	/**
-	 * Reject all timers currently stored.
-	 * Especially useful for a Scratch "stop."
-	 */
-	YieldTimers.rejectAll = function () {
-	    YieldTimers.timers = {};
-	    YieldTimers.timerId = 0;
-	};
-
-	module.exports = YieldTimers;
-
-
-/***/ },
-/* 11 */
-/***/ function(module, exports) {
-
-	function Scratch3Blocks(runtime) {
-	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
-	     */
-	    this.runtime = runtime;
-	}
-
-	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
-	 */
-	Scratch3Blocks.prototype.getPrimitives = function() {
-	    return {
-	        'control_repeat': this.repeat,
-	        'control_forever': this.forever,
-	        'control_wait': this.wait,
-	        'control_stop': this.stop,
-	        'event_whenflagclicked': this.whenFlagClicked,
-	        'event_whenbroadcastreceived': this.whenBroadcastReceived,
-	        'event_broadcast': this.broadcast
-	    };
-	};
-
-	Scratch3Blocks.prototype.repeat = function(argValues, util) {
-	    console.log('Running: control_repeat');
-	    // Initialize loop
-	    if (util.stackFrame.loopCounter === undefined) {
-	        util.stackFrame.loopCounter = parseInt(argValues[0]); // @todo arg
-	    }
-	    // Decrease counter
-	    util.stackFrame.loopCounter--;
-	    // If we still have some left, start the substack
-	    if (util.stackFrame.loopCounter >= 0) {
-	        util.startSubstack();
-	    }
-	};
-
-	Scratch3Blocks.prototype.forever = function(argValues, util) {
-	    console.log('Running: control_forever');
-	    util.startSubstack();
-	};
-
-	Scratch3Blocks.prototype.wait = function(argValues, util) {
-	    console.log('Running: control_wait');
-	    util.yield();
-	    util.timeout(function() {
-	        util.done();
-	    }, 1000 * parseFloat(argValues[0]));
-	};
-
-	Scratch3Blocks.prototype.stop = function() {
-	    console.log('Running: control_stop');
-	    // @todo - don't use this.runtime
-	    this.runtime.stopAll();
-	};
-
-	Scratch3Blocks.prototype.whenFlagClicked = function() {
-	    console.log('Running: event_whenflagclicked');
-	    // No-op
-	};
-
-	Scratch3Blocks.prototype.whenBroadcastReceived = function() {
-	    console.log('Running: event_whenbroadcastreceived');
-	    // No-op
-	};
-
-	Scratch3Blocks.prototype.broadcast = function(argValues, util) {
-	    console.log('Running: event_broadcast');
-	    util.startHats(function(hat) {
-	        if (hat.opcode === 'event_whenbroadcastreceived') {
-	            var shadows = hat.fields.CHOICE.blocks;
-	            for (var sb in shadows) {
-	                var shadowblock = shadows[sb];
-	                return shadowblock.fields.CHOICE.value === argValues[0];
-	            }
-	        }
-	        return false;
-	    });
-	};
-
-	module.exports = Scratch3Blocks;
-
-
-/***/ },
-/* 12 */
-/***/ function(module, exports, __webpack_require__) {
-
-	
-	var YieldTimers = __webpack_require__(10);
-
-	function WeDo2Blocks(runtime) {
-	    /**
-	     * The runtime instantiating this block package.
-	     * @type {Runtime}
-	     */
-	    this.runtime = runtime;
-
-	    /**
-	     * Current motor speed, as a percentage (100 = full speed).
-	     * @type {number}
-	     * @private
-	     */
-	    this._motorSpeed = 100;
-
-	    /**
-	     * The timeout ID for a pending motor action.
-	     * @type {?int}
-	     * @private
-	     */
-	    this._motorTimeout = null;
-	}
-
-	/**
-	 * Retrieve the block primitives implemented by this package.
-	 * @return {Object.<string, Function>} Mapping of opcode to Function.
-	 */
-	WeDo2Blocks.prototype.getPrimitives = function() {
-	    return {
-	        'wedo_motorclockwise': this.motorClockwise,
-	        'wedo_motorcounterclockwise': this.motorCounterClockwise,
-	        'wedo_motorspeed': this.motorSpeed,
-	        'wedo_setcolor': this.setColor,
-	        'wedo_whendistanceclose': this.whenDistanceClose,
-	        'wedo_whentilt': this.whenTilt
-	    };
-	};
-
-	/**
-	 * Clamp a value between a minimum and maximum value.
-	 * @todo move this to a common utility class.
-	 * @param val The value to clamp.
-	 * @param min The minimum return value.
-	 * @param max The maximum return value.
-	 * @returns {number} The clamped value.
-	 * @private
-	 */
-	WeDo2Blocks.prototype._clamp = function(val, min, max) {
-	    return Math.max(min, Math.min(val, max));
-	};
-
-	/**
-	 * Common implementation for motor blocks.
-	 * @param direction The direction to turn ('left' or 'right').
-	 * @param durationSeconds The number of seconds to run.
-	 * @param util The util instance to use for yielding and finishing.
-	 * @private
-	 */
-	WeDo2Blocks.prototype._motorOnFor = function(direction, durationSeconds, util) {
-	    if (this._motorTimeout > 0) {
-	        // @todo maybe this should go through util
-	        YieldTimers.resolve(this._motorTimeout);
-	        this._motorTimeout = null;
-	    }
-	    if (window.native) {
-	        window.native.motorRun(direction, this._motorSpeed);
-	    }
-
-	    var instance = this;
-	    var myTimeout = this._motorTimeout = util.timeout(function() {
-	        if (instance._motorTimeout == myTimeout) {
-	            instance._motorTimeout = null;
-	        }
-	        if (window.native) {
-	            window.native.motorStop();
-	        }
-	        util.done();
-	    }, 1000 * durationSeconds);
-
-	    util.yield();
-	};
-
-	WeDo2Blocks.prototype.motorClockwise = function(argValues, util) {
-	    this._motorOnFor('right', parseFloat(argValues[0]), util);
-	};
-
-	WeDo2Blocks.prototype.motorCounterClockwise = function(argValues, util) {
-	    this._motorOnFor('left', parseFloat(argValues[0]), util);
-	};
-
-	WeDo2Blocks.prototype.motorSpeed = function(argValues) {
-	    var speed = argValues[0];
-	    switch (speed) {
-	    case 'slow':
-	        this._motorSpeed = 20;
-	        break;
-	    case 'medium':
-	        this._motorSpeed = 50;
-	        break;
-	    case 'fast':
-	        this._motorSpeed = 100;
-	        break;
-	    }
-	};
-
-	/**
-	 * Convert a color name to a WeDo color index.
-	 * Supports 'mystery' for a random hue.
-	 * @param colorName The color to retrieve.
-	 * @returns {number} The WeDo color index.
-	 * @private
-	 */
-	WeDo2Blocks.prototype._getColor = function(colorName) {
-	    var colors = {
-	        'yellow': 7,
-	        'orange': 8,
-	        'coral': 9,
-	        'magenta': 1,
-	        'purple': 2,
-	        'blue': 3,
-	        'green': 6,
-	        'white': 10
-	    };
-
-	    if (colorName == 'mystery') {
-	        return Math.floor((Math.random() * 10) + 1);
-	    }
-
-	    return colors[colorName];
-	};
-
-	WeDo2Blocks.prototype.setColor = function(argValues, util) {
-	    if (window.native) {
-	        var colorIndex = this._getColor(argValues[0]);
-	        window.native.setLedColor(colorIndex);
-	    }
-	    // Pause for quarter second
-	    util.yield();
-	    util.timeout(function() {
-	        util.done();
-	    }, 250);
-	};
-
-	WeDo2Blocks.prototype.whenDistanceClose = function() {
-	    console.log('Running: wedo_whendistanceclose');
-	};
-
-	WeDo2Blocks.prototype.whenTilt = function() {
-	    console.log('Running: wedo_whentilt');
-	};
-
-	module.exports = WeDo2Blocks;
-
-
-/***/ },
-/* 13 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var html = __webpack_require__(14);
-	var memoize = __webpack_require__(65);
-	var parseDOM = memoize(html.parseDOM, {
-	    length: 1,
-	    resolvers: [String],
-	    max: 200
-	});
-
-	/**
-	 * Adapter between block creation events and block representation which can be
-	 * used by the Scratch runtime.
-	 *
-	 * @param {Object} `Blockly.events.create`
-	 *
-	 * @return {Object}
-	 */
-	module.exports = function (e) {
-	    // Validate input
-	    if (typeof e !== 'object') return;
-	    if (typeof e.blockId !== 'string') return;
-	    if (typeof e.xml !== 'object') return;
-
-	    // Storage object
-	    var obj = {
-	        id: e.blockId,
-	        opcode: null,
-	        next: null,
-	        fields: {}
-	    };
-
-	    // Set opcode
-	    if (typeof e.xml.attributes === 'object') {
-	        obj.opcode = e.xml.attributes.type.value;
-	    }
-
-	    // Extract fields from event's `innerHTML`
-	    if (typeof e.xml.innerHTML !== 'string') return obj;
-	    if (e.xml.innerHTML === '') return obj;
-	    obj.fields = extract(parseDOM(e.xml.innerHTML));
-
-	    return obj;
-	};
-
-	/**
-	 * Extracts fields from a block's innerHTML.
-	 * @todo Extend this to support vertical grammar / nested blocks.
-	 *
-	 * @param {Object} DOM representation of block's innerHTML
-	 *
-	 * @return {Object}
-	 */
-	function extract (dom) {
-	    // Storage object
-	    var fields = {};
-
-	    // Field
-	    var field = dom[0];
-	    var fieldName = field.attribs.name;
-	    fields[fieldName] = {
-	        name: fieldName,
-	        value: null,
-	        blocks: {}
-	    };
-
-	    // Shadow block
-	    var shadow = field.children[0];
-	    var shadowId = shadow.attribs.id;
-	    var shadowOpcode = shadow.attribs.type;
-	    fields[fieldName].blocks[shadowId] = {
-	        id: shadowId,
-	        opcode: shadowOpcode,
-	        next: null,
-	        fields: {}
-	    };
-
-	    // Primitive
-	    var primitive = shadow.children[0];
-	    var primitiveName = primitive.attribs.name;
-	    var primitiveValue = primitive.children[0].data;
-	    fields[fieldName].blocks[shadowId].fields[primitiveName] = {
-	        name: primitiveName,
-	        value: primitiveValue,
-	        blocks: null
-	    };
-
-	    return fields;
-	}
-
-
-/***/ },
-/* 14 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Parser = __webpack_require__(15),
-	    DomHandler = __webpack_require__(22);
-
-	function defineProp(name, value){
-		delete module.exports[name];
-		module.exports[name] = value;
-		return value;
-	}
-
-	module.exports = {
-		Parser: Parser,
-		Tokenizer: __webpack_require__(16),
-		ElementType: __webpack_require__(23),
-		DomHandler: DomHandler,
-		get FeedHandler(){
-			return defineProp("FeedHandler", __webpack_require__(26));
-		},
-		get Stream(){
-			return defineProp("Stream", __webpack_require__(27));
-		},
-		get WritableStream(){
-			return defineProp("WritableStream", __webpack_require__(28));
-		},
-		get ProxyHandler(){
-			return defineProp("ProxyHandler", __webpack_require__(51));
-		},
-		get DomUtils(){
-			return defineProp("DomUtils", __webpack_require__(52));
-		},
-		get CollectingHandler(){
-			return defineProp("CollectingHandler", __webpack_require__(64));
-		},
-		// For legacy support
-		DefaultHandler: DomHandler,
-		get RssHandler(){
-			return defineProp("RssHandler", this.FeedHandler);
-		},
-		//helper methods
-		parseDOM: function(data, options){
-			var handler = new DomHandler(options);
-			new Parser(handler, options).end(data);
-			return handler.dom;
-		},
-		parseFeed: function(feed, options){
-			var handler = new module.exports.FeedHandler(options);
-			new Parser(handler, options).end(feed);
-			return handler.dom;
-		},
-		createDomStream: function(cb, options, elementCb){
-			var handler = new DomHandler(cb, options, elementCb);
-			return new Parser(handler, options);
-		},
-		// List of all events that the parser emits
-		EVENTS: { /* Format: eventname: number of arguments */
-			attribute: 2,
-			cdatastart: 0,
-			cdataend: 0,
-			text: 1,
-			processinginstruction: 2,
-			comment: 1,
-			commentend: 0,
-			closetag: 1,
-			opentag: 2,
-			opentagname: 1,
-			error: 1,
-			end: 0
-		}
-	};
-
-
-/***/ },
-/* 15 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var Tokenizer = __webpack_require__(16);
-
-	/*
-		Options:
-
-		xmlMode: Disables the special behavior for script/style tags (false by default)
-		lowerCaseAttributeNames: call .toLowerCase for each attribute name (true if xmlMode is `false`)
-		lowerCaseTags: call .toLowerCase for each tag name (true if xmlMode is `false`)
-	*/
-
-	/*
-		Callbacks:
-
-		oncdataend,
-		oncdatastart,
-		onclosetag,
-		oncomment,
-		oncommentend,
-		onerror,
-		onopentag,
-		onprocessinginstruction,
-		onreset,
-		ontext
-	*/
-
-	var formTags = {
-		input: true,
-		option: true,
-		optgroup: true,
-		select: true,
-		button: true,
-		datalist: true,
-		textarea: true
-	};
-
-	var openImpliesClose = {
-		tr      : { tr:true, th:true, td:true },
-		th      : { th:true },
-		td      : { thead:true, th:true, td:true },
-		body    : { head:true, link:true, script:true },
-		li      : { li:true },
-		p       : { p:true },
-		h1      : { p:true },
-		h2      : { p:true },
-		h3      : { p:true },
-		h4      : { p:true },
-		h5      : { p:true },
-		h6      : { p:true },
-		select  : formTags,
-		input   : formTags,
-		output  : formTags,
-		button  : formTags,
-		datalist: formTags,
-		textarea: formTags,
-		option  : { option:true },
-		optgroup: { optgroup:true }
-	};
-
-	var voidElements = {
-		__proto__: null,
-		area: true,
-		base: true,
-		basefont: true,
-		br: true,
-		col: true,
-		command: true,
-		embed: true,
-		frame: true,
-		hr: true,
-		img: true,
-		input: true,
-		isindex: true,
-		keygen: true,
-		link: true,
-		meta: true,
-		param: true,
-		source: true,
-		track: true,
-		wbr: true,
-
-		//common self closing svg elements
-		path: true,
-		circle: true,
-		ellipse: true,
-		line: true,
-		rect: true,
-		use: true,
-		stop: true,
-		polyline: true,
-		polygon: true
-	};
-
-	var re_nameEnd = /\s|\//;
-
-	function Parser(cbs, options){
-		this._options = options || {};
-		this._cbs = cbs || {};
-
-		this._tagname = "";
-		this._attribname = "";
-		this._attribvalue = "";
-		this._attribs = null;
-		this._stack = [];
-
-		this.startIndex = 0;
-		this.endIndex = null;
-
-		this._lowerCaseTagNames = "lowerCaseTags" in this._options ?
-										!!this._options.lowerCaseTags :
-										!this._options.xmlMode;
-		this._lowerCaseAttributeNames = "lowerCaseAttributeNames" in this._options ?
-										!!this._options.lowerCaseAttributeNames :
-										!this._options.xmlMode;
-		if(!!this._options.Tokenizer) {
-			Tokenizer = this._options.Tokenizer;
-		}
-		this._tokenizer = new Tokenizer(this._options, this);
-
-		if(this._cbs.onparserinit) this._cbs.onparserinit(this);
-	}
-
-	__webpack_require__(2).inherits(Parser, __webpack_require__(1).EventEmitter);
-
-	Parser.prototype._updatePosition = function(initialOffset){
-		if(this.endIndex === null){
-			if(this._tokenizer._sectionStart <= initialOffset){
-				this.startIndex = 0;
-			} else {
-				this.startIndex = this._tokenizer._sectionStart - initialOffset;
-			}
-		}
-		else this.startIndex = this.endIndex + 1;
-		this.endIndex = this._tokenizer.getAbsoluteIndex();
-	};
-
-	//Tokenizer event handlers
-	Parser.prototype.ontext = function(data){
-		this._updatePosition(1);
-		this.endIndex--;
-
-		if(this._cbs.ontext) this._cbs.ontext(data);
-	};
-
-	Parser.prototype.onopentagname = function(name){
-		if(this._lowerCaseTagNames){
-			name = name.toLowerCase();
-		}
-
-		this._tagname = name;
-
-		if(!this._options.xmlMode && name in openImpliesClose) {
-			for(
-				var el;
-				(el = this._stack[this._stack.length - 1]) in openImpliesClose[name];
-				this.onclosetag(el)
-			);
-		}
-
-		if(this._options.xmlMode || !(name in voidElements)){
-			this._stack.push(name);
-		}
-
-		if(this._cbs.onopentagname) this._cbs.onopentagname(name);
-		if(this._cbs.onopentag) this._attribs = {};
-	};
-
-	Parser.prototype.onopentagend = function(){
-		this._updatePosition(1);
-
-		if(this._attribs){
-			if(this._cbs.onopentag) this._cbs.onopentag(this._tagname, this._attribs);
-			this._attribs = null;
-		}
-
-		if(!this._options.xmlMode && this._cbs.onclosetag && this._tagname in voidElements){
-			this._cbs.onclosetag(this._tagname);
-		}
-
-		this._tagname = "";
-	};
-
-	Parser.prototype.onclosetag = function(name){
-		this._updatePosition(1);
-
-		if(this._lowerCaseTagNames){
-			name = name.toLowerCase();
-		}
-
-		if(this._stack.length && (!(name in voidElements) || this._options.xmlMode)){
-			var pos = this._stack.lastIndexOf(name);
-			if(pos !== -1){
-				if(this._cbs.onclosetag){
-					pos = this._stack.length - pos;
-					while(pos--) this._cbs.onclosetag(this._stack.pop());
-				}
-				else this._stack.length = pos;
-			} else if(name === "p" && !this._options.xmlMode){
-				this.onopentagname(name);
-				this._closeCurrentTag();
-			}
-		} else if(!this._options.xmlMode && (name === "br" || name === "p")){
-			this.onopentagname(name);
-			this._closeCurrentTag();
-		}
-	};
-
-	Parser.prototype.onselfclosingtag = function(){
-		if(this._options.xmlMode || this._options.recognizeSelfClosing){
-			this._closeCurrentTag();
-		} else {
-			this.onopentagend();
-		}
-	};
-
-	Parser.prototype._closeCurrentTag = function(){
-		var name = this._tagname;
-
-		this.onopentagend();
-
-		//self-closing tags will be on the top of the stack
-		//(cheaper check than in onclosetag)
-		if(this._stack[this._stack.length - 1] === name){
-			if(this._cbs.onclosetag){
-				this._cbs.onclosetag(name);
-			}
-			this._stack.pop();
-		}
-	};
-
-	Parser.prototype.onattribname = function(name){
-		if(this._lowerCaseAttributeNames){
-			name = name.toLowerCase();
-		}
-		this._attribname = name;
-	};
-
-	Parser.prototype.onattribdata = function(value){
-		this._attribvalue += value;
-	};
-
-	Parser.prototype.onattribend = function(){
-		if(this._cbs.onattribute) this._cbs.onattribute(this._attribname, this._attribvalue);
-		if(
-			this._attribs &&
-			!Object.prototype.hasOwnProperty.call(this._attribs, this._attribname)
-		){
-			this._attribs[this._attribname] = this._attribvalue;
-		}
-		this._attribname = "";
-		this._attribvalue = "";
-	};
-
-	Parser.prototype._getInstructionName = function(value){
-		var idx = value.search(re_nameEnd),
-		    name = idx < 0 ? value : value.substr(0, idx);
-
-		if(this._lowerCaseTagNames){
-			name = name.toLowerCase();
-		}
-
-		return name;
-	};
-
-	Parser.prototype.ondeclaration = function(value){
-		if(this._cbs.onprocessinginstruction){
-			var name = this._getInstructionName(value);
-			this._cbs.onprocessinginstruction("!" + name, "!" + value);
-		}
-	};
-
-	Parser.prototype.onprocessinginstruction = function(value){
-		if(this._cbs.onprocessinginstruction){
-			var name = this._getInstructionName(value);
-			this._cbs.onprocessinginstruction("?" + name, "?" + value);
-		}
-	};
-
-	Parser.prototype.oncomment = function(value){
-		this._updatePosition(4);
-
-		if(this._cbs.oncomment) this._cbs.oncomment(value);
-		if(this._cbs.oncommentend) this._cbs.oncommentend();
-	};
-
-	Parser.prototype.oncdata = function(value){
-		this._updatePosition(1);
-
-		if(this._options.xmlMode || this._options.recognizeCDATA){
-			if(this._cbs.oncdatastart) this._cbs.oncdatastart();
-			if(this._cbs.ontext) this._cbs.ontext(value);
-			if(this._cbs.oncdataend) this._cbs.oncdataend();
-		} else {
-			this.oncomment("[CDATA[" + value + "]]");
-		}
-	};
-
-	Parser.prototype.onerror = function(err){
-		if(this._cbs.onerror) this._cbs.onerror(err);
-	};
-
-	Parser.prototype.onend = function(){
-		if(this._cbs.onclosetag){
-			for(
-				var i = this._stack.length;
-				i > 0;
-				this._cbs.onclosetag(this._stack[--i])
-			);
-		}
-		if(this._cbs.onend) this._cbs.onend();
-	};
-
-
-	//Resets the parser to a blank state, ready to parse a new HTML document
-	Parser.prototype.reset = function(){
-		if(this._cbs.onreset) this._cbs.onreset();
-		this._tokenizer.reset();
-
-		this._tagname = "";
-		this._attribname = "";
-		this._attribs = null;
-		this._stack = [];
-
-		if(this._cbs.onparserinit) this._cbs.onparserinit(this);
-	};
-
-	//Parses a complete HTML document and pushes it to the handler
-	Parser.prototype.parseComplete = function(data){
-		this.reset();
-		this.end(data);
-	};
-
-	Parser.prototype.write = function(chunk){
-		this._tokenizer.write(chunk);
-	};
-
-	Parser.prototype.end = function(chunk){
-		this._tokenizer.end(chunk);
-	};
-
-	Parser.prototype.pause = function(){
-		this._tokenizer.pause();
-	};
-
-	Parser.prototype.resume = function(){
-		this._tokenizer.resume();
-	};
-
-	//alias for backwards compat
-	Parser.prototype.parseChunk = Parser.prototype.write;
-	Parser.prototype.done = Parser.prototype.end;
-
-	module.exports = Parser;
-
-
-/***/ },
-/* 16 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = Tokenizer;
-
-	var decodeCodePoint = __webpack_require__(17),
-	    entityMap = __webpack_require__(19),
-	    legacyMap = __webpack_require__(20),
-	    xmlMap    = __webpack_require__(21),
-
-	    i = 0,
-
-	    TEXT                      = i++,
-	    BEFORE_TAG_NAME           = i++, //after <
-	    IN_TAG_NAME               = i++,
-	    IN_SELF_CLOSING_TAG       = i++,
-	    BEFORE_CLOSING_TAG_NAME   = i++,
-	    IN_CLOSING_TAG_NAME       = i++,
-	    AFTER_CLOSING_TAG_NAME    = i++,
-
-	    //attributes
-	    BEFORE_ATTRIBUTE_NAME     = i++,
-	    IN_ATTRIBUTE_NAME         = i++,
-	    AFTER_ATTRIBUTE_NAME      = i++,
-	    BEFORE_ATTRIBUTE_VALUE    = i++,
-	    IN_ATTRIBUTE_VALUE_DQ     = i++, // "
-	    IN_ATTRIBUTE_VALUE_SQ     = i++, // '
-	    IN_ATTRIBUTE_VALUE_NQ     = i++,
-
-	    //declarations
-	    BEFORE_DECLARATION        = i++, // !
-	    IN_DECLARATION            = i++,
-
-	    //processing instructions
-	    IN_PROCESSING_INSTRUCTION = i++, // ?
-
-	    //comments
-	    BEFORE_COMMENT            = i++,
-	    IN_COMMENT                = i++,
-	    AFTER_COMMENT_1           = i++,
-	    AFTER_COMMENT_2           = i++,
-
-	    //cdata
-	    BEFORE_CDATA_1            = i++, // [
-	    BEFORE_CDATA_2            = i++, // C
-	    BEFORE_CDATA_3            = i++, // D
-	    BEFORE_CDATA_4            = i++, // A
-	    BEFORE_CDATA_5            = i++, // T
-	    BEFORE_CDATA_6            = i++, // A
-	    IN_CDATA                  = i++, // [
-	    AFTER_CDATA_1             = i++, // ]
-	    AFTER_CDATA_2             = i++, // ]
-
-	    //special tags
-	    BEFORE_SPECIAL            = i++, //S
-	    BEFORE_SPECIAL_END        = i++,   //S
-
-	    BEFORE_SCRIPT_1           = i++, //C
-	    BEFORE_SCRIPT_2           = i++, //R
-	    BEFORE_SCRIPT_3           = i++, //I
-	    BEFORE_SCRIPT_4           = i++, //P
-	    BEFORE_SCRIPT_5           = i++, //T
-	    AFTER_SCRIPT_1            = i++, //C
-	    AFTER_SCRIPT_2            = i++, //R
-	    AFTER_SCRIPT_3            = i++, //I
-	    AFTER_SCRIPT_4            = i++, //P
-	    AFTER_SCRIPT_5            = i++, //T
-
-	    BEFORE_STYLE_1            = i++, //T
-	    BEFORE_STYLE_2            = i++, //Y
-	    BEFORE_STYLE_3            = i++, //L
-	    BEFORE_STYLE_4            = i++, //E
-	    AFTER_STYLE_1             = i++, //T
-	    AFTER_STYLE_2             = i++, //Y
-	    AFTER_STYLE_3             = i++, //L
-	    AFTER_STYLE_4             = i++, //E
-
-	    BEFORE_ENTITY             = i++, //&
-	    BEFORE_NUMERIC_ENTITY     = i++, //#
-	    IN_NAMED_ENTITY           = i++,
-	    IN_NUMERIC_ENTITY         = i++,
-	    IN_HEX_ENTITY             = i++, //X
-
-	    j = 0,
-
-	    SPECIAL_NONE              = j++,
-	    SPECIAL_SCRIPT            = j++,
-	    SPECIAL_STYLE             = j++;
-
-	function whitespace(c){
-		return c === " " || c === "\n" || c === "\t" || c === "\f" || c === "\r";
-	}
-
-	function characterState(char, SUCCESS){
-		return function(c){
-			if(c === char) this._state = SUCCESS;
-		};
-	}
-
-	function ifElseState(upper, SUCCESS, FAILURE){
-		var lower = upper.toLowerCase();
-
-		if(upper === lower){
-			return function(c){
-				if(c === lower){
-					this._state = SUCCESS;
-				} else {
-					this._state = FAILURE;
-					this._index--;
-				}
-			};
-		} else {
-			return function(c){
-				if(c === lower || c === upper){
-					this._state = SUCCESS;
-				} else {
-					this._state = FAILURE;
-					this._index--;
-				}
-			};
-		}
-	}
-
-	function consumeSpecialNameChar(upper, NEXT_STATE){
-		var lower = upper.toLowerCase();
-
-		return function(c){
-			if(c === lower || c === upper){
-				this._state = NEXT_STATE;
-			} else {
-				this._state = IN_TAG_NAME;
-				this._index--; //consume the token again
-			}
-		};
-	}
-
-	function Tokenizer(options, cbs){
-		this._state = TEXT;
-		this._buffer = "";
-		this._sectionStart = 0;
-		this._index = 0;
-		this._bufferOffset = 0; //chars removed from _buffer
-		this._baseState = TEXT;
-		this._special = SPECIAL_NONE;
-		this._cbs = cbs;
-		this._running = true;
-		this._ended = false;
-		this._xmlMode = !!(options && options.xmlMode);
-		this._decodeEntities = !!(options && options.decodeEntities);
-	}
-
-	Tokenizer.prototype._stateText = function(c){
-		if(c === "<"){
-			if(this._index > this._sectionStart){
-				this._cbs.ontext(this._getSection());
-			}
-			this._state = BEFORE_TAG_NAME;
-			this._sectionStart = this._index;
-		} else if(this._decodeEntities && this._special === SPECIAL_NONE && c === "&"){
-			if(this._index > this._sectionStart){
-				this._cbs.ontext(this._getSection());
-			}
-			this._baseState = TEXT;
-			this._state = BEFORE_ENTITY;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateBeforeTagName = function(c){
-		if(c === "/"){
-			this._state = BEFORE_CLOSING_TAG_NAME;
-		} else if(c === ">" || this._special !== SPECIAL_NONE || whitespace(c)) {
-			this._state = TEXT;
-		} else if(c === "!"){
-			this._state = BEFORE_DECLARATION;
-			this._sectionStart = this._index + 1;
-		} else if(c === "?"){
-			this._state = IN_PROCESSING_INSTRUCTION;
-			this._sectionStart = this._index + 1;
-		} else if(c === "<"){
-			this._cbs.ontext(this._getSection());
-			this._sectionStart = this._index;
-		} else {
-			this._state = (!this._xmlMode && (c === "s" || c === "S")) ?
-							BEFORE_SPECIAL : IN_TAG_NAME;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateInTagName = function(c){
-		if(c === "/" || c === ">" || whitespace(c)){
-			this._emitToken("onopentagname");
-			this._state = BEFORE_ATTRIBUTE_NAME;
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._stateBeforeCloseingTagName = function(c){
-		if(whitespace(c));
-		else if(c === ">"){
-			this._state = TEXT;
-		} else if(this._special !== SPECIAL_NONE){
-			if(c === "s" || c === "S"){
-				this._state = BEFORE_SPECIAL_END;
-			} else {
-				this._state = TEXT;
-				this._index--;
-			}
-		} else {
-			this._state = IN_CLOSING_TAG_NAME;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateInCloseingTagName = function(c){
-		if(c === ">" || whitespace(c)){
-			this._emitToken("onclosetag");
-			this._state = AFTER_CLOSING_TAG_NAME;
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._stateAfterCloseingTagName = function(c){
-		//skip everything until ">"
-		if(c === ">"){
-			this._state = TEXT;
-			this._sectionStart = this._index + 1;
-		}
-	};
-
-	Tokenizer.prototype._stateBeforeAttributeName = function(c){
-		if(c === ">"){
-			this._cbs.onopentagend();
-			this._state = TEXT;
-			this._sectionStart = this._index + 1;
-		} else if(c === "/"){
-			this._state = IN_SELF_CLOSING_TAG;
-		} else if(!whitespace(c)){
-			this._state = IN_ATTRIBUTE_NAME;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateInSelfClosingTag = function(c){
-		if(c === ">"){
-			this._cbs.onselfclosingtag();
-			this._state = TEXT;
-			this._sectionStart = this._index + 1;
-		} else if(!whitespace(c)){
-			this._state = BEFORE_ATTRIBUTE_NAME;
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._stateInAttributeName = function(c){
-		if(c === "=" || c === "/" || c === ">" || whitespace(c)){
-			this._cbs.onattribname(this._getSection());
-			this._sectionStart = -1;
-			this._state = AFTER_ATTRIBUTE_NAME;
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._stateAfterAttributeName = function(c){
-		if(c === "="){
-			this._state = BEFORE_ATTRIBUTE_VALUE;
-		} else if(c === "/" || c === ">"){
-			this._cbs.onattribend();
-			this._state = BEFORE_ATTRIBUTE_NAME;
-			this._index--;
-		} else if(!whitespace(c)){
-			this._cbs.onattribend();
-			this._state = IN_ATTRIBUTE_NAME;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateBeforeAttributeValue = function(c){
-		if(c === "\""){
-			this._state = IN_ATTRIBUTE_VALUE_DQ;
-			this._sectionStart = this._index + 1;
-		} else if(c === "'"){
-			this._state = IN_ATTRIBUTE_VALUE_SQ;
-			this._sectionStart = this._index + 1;
-		} else if(!whitespace(c)){
-			this._state = IN_ATTRIBUTE_VALUE_NQ;
-			this._sectionStart = this._index;
-			this._index--; //reconsume token
-		}
-	};
-
-	Tokenizer.prototype._stateInAttributeValueDoubleQuotes = function(c){
-		if(c === "\""){
-			this._emitToken("onattribdata");
-			this._cbs.onattribend();
-			this._state = BEFORE_ATTRIBUTE_NAME;
-		} else if(this._decodeEntities && c === "&"){
-			this._emitToken("onattribdata");
-			this._baseState = this._state;
-			this._state = BEFORE_ENTITY;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateInAttributeValueSingleQuotes = function(c){
-		if(c === "'"){
-			this._emitToken("onattribdata");
-			this._cbs.onattribend();
-			this._state = BEFORE_ATTRIBUTE_NAME;
-		} else if(this._decodeEntities && c === "&"){
-			this._emitToken("onattribdata");
-			this._baseState = this._state;
-			this._state = BEFORE_ENTITY;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateInAttributeValueNoQuotes = function(c){
-		if(whitespace(c) || c === ">"){
-			this._emitToken("onattribdata");
-			this._cbs.onattribend();
-			this._state = BEFORE_ATTRIBUTE_NAME;
-			this._index--;
-		} else if(this._decodeEntities && c === "&"){
-			this._emitToken("onattribdata");
-			this._baseState = this._state;
-			this._state = BEFORE_ENTITY;
-			this._sectionStart = this._index;
-		}
-	};
-
-	Tokenizer.prototype._stateBeforeDeclaration = function(c){
-		this._state = c === "[" ? BEFORE_CDATA_1 :
-						c === "-" ? BEFORE_COMMENT :
-							IN_DECLARATION;
-	};
-
-	Tokenizer.prototype._stateInDeclaration = function(c){
-		if(c === ">"){
-			this._cbs.ondeclaration(this._getSection());
-			this._state = TEXT;
-			this._sectionStart = this._index + 1;
-		}
-	};
-
-	Tokenizer.prototype._stateInProcessingInstruction = function(c){
-		if(c === ">"){
-			this._cbs.onprocessinginstruction(this._getSection());
-			this._state = TEXT;
-			this._sectionStart = this._index + 1;
-		}
-	};
-
-	Tokenizer.prototype._stateBeforeComment = function(c){
-		if(c === "-"){
-			this._state = IN_COMMENT;
-			this._sectionStart = this._index + 1;
-		} else {
-			this._state = IN_DECLARATION;
-		}
-	};
-
-	Tokenizer.prototype._stateInComment = function(c){
-		if(c === "-") this._state = AFTER_COMMENT_1;
-	};
-
-	Tokenizer.prototype._stateAfterComment1 = function(c){
-		if(c === "-"){
-			this._state = AFTER_COMMENT_2;
-		} else {
-			this._state = IN_COMMENT;
-		}
-	};
-
-	Tokenizer.prototype._stateAfterComment2 = function(c){
-		if(c === ">"){
-			//remove 2 trailing chars
-			this._cbs.oncomment(this._buffer.substring(this._sectionStart, this._index - 2));
-			this._state = TEXT;
-			this._sectionStart = this._index + 1;
-		} else if(c !== "-"){
-			this._state = IN_COMMENT;
-		}
-		// else: stay in AFTER_COMMENT_2 (`--->`)
-	};
-
-	Tokenizer.prototype._stateBeforeCdata1 = ifElseState("C", BEFORE_CDATA_2, IN_DECLARATION);
-	Tokenizer.prototype._stateBeforeCdata2 = ifElseState("D", BEFORE_CDATA_3, IN_DECLARATION);
-	Tokenizer.prototype._stateBeforeCdata3 = ifElseState("A", BEFORE_CDATA_4, IN_DECLARATION);
-	Tokenizer.prototype._stateBeforeCdata4 = ifElseState("T", BEFORE_CDATA_5, IN_DECLARATION);
-	Tokenizer.prototype._stateBeforeCdata5 = ifElseState("A", BEFORE_CDATA_6, IN_DECLARATION);
-
-	Tokenizer.prototype._stateBeforeCdata6 = function(c){
-		if(c === "["){
-			this._state = IN_CDATA;
-			this._sectionStart = this._index + 1;
-		} else {
-			this._state = IN_DECLARATION;
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._stateInCdata = function(c){
-		if(c === "]") this._state = AFTER_CDATA_1;
-	};
-
-	Tokenizer.prototype._stateAfterCdata1 = characterState("]", AFTER_CDATA_2);
-
-	Tokenizer.prototype._stateAfterCdata2 = function(c){
-		if(c === ">"){
-			//remove 2 trailing chars
-			this._cbs.oncdata(this._buffer.substring(this._sectionStart, this._index - 2));
-			this._state = TEXT;
-			this._sectionStart = this._index + 1;
-		} else if(c !== "]") {
-			this._state = IN_CDATA;
-		}
-		//else: stay in AFTER_CDATA_2 (`]]]>`)
-	};
-
-	Tokenizer.prototype._stateBeforeSpecial = function(c){
-		if(c === "c" || c === "C"){
-			this._state = BEFORE_SCRIPT_1;
-		} else if(c === "t" || c === "T"){
-			this._state = BEFORE_STYLE_1;
-		} else {
-			this._state = IN_TAG_NAME;
-			this._index--; //consume the token again
-		}
-	};
-
-	Tokenizer.prototype._stateBeforeSpecialEnd = function(c){
-		if(this._special === SPECIAL_SCRIPT && (c === "c" || c === "C")){
-			this._state = AFTER_SCRIPT_1;
-		} else if(this._special === SPECIAL_STYLE && (c === "t" || c === "T")){
-			this._state = AFTER_STYLE_1;
-		}
-		else this._state = TEXT;
-	};
-
-	Tokenizer.prototype._stateBeforeScript1 = consumeSpecialNameChar("R", BEFORE_SCRIPT_2);
-	Tokenizer.prototype._stateBeforeScript2 = consumeSpecialNameChar("I", BEFORE_SCRIPT_3);
-	Tokenizer.prototype._stateBeforeScript3 = consumeSpecialNameChar("P", BEFORE_SCRIPT_4);
-	Tokenizer.prototype._stateBeforeScript4 = consumeSpecialNameChar("T", BEFORE_SCRIPT_5);
-
-	Tokenizer.prototype._stateBeforeScript5 = function(c){
-		if(c === "/" || c === ">" || whitespace(c)){
-			this._special = SPECIAL_SCRIPT;
-		}
-		this._state = IN_TAG_NAME;
-		this._index--; //consume the token again
-	};
-
-	Tokenizer.prototype._stateAfterScript1 = ifElseState("R", AFTER_SCRIPT_2, TEXT);
-	Tokenizer.prototype._stateAfterScript2 = ifElseState("I", AFTER_SCRIPT_3, TEXT);
-	Tokenizer.prototype._stateAfterScript3 = ifElseState("P", AFTER_SCRIPT_4, TEXT);
-	Tokenizer.prototype._stateAfterScript4 = ifElseState("T", AFTER_SCRIPT_5, TEXT);
-
-	Tokenizer.prototype._stateAfterScript5 = function(c){
-		if(c === ">" || whitespace(c)){
-			this._special = SPECIAL_NONE;
-			this._state = IN_CLOSING_TAG_NAME;
-			this._sectionStart = this._index - 6;
-			this._index--; //reconsume the token
-		}
-		else this._state = TEXT;
-	};
-
-	Tokenizer.prototype._stateBeforeStyle1 = consumeSpecialNameChar("Y", BEFORE_STYLE_2);
-	Tokenizer.prototype._stateBeforeStyle2 = consumeSpecialNameChar("L", BEFORE_STYLE_3);
-	Tokenizer.prototype._stateBeforeStyle3 = consumeSpecialNameChar("E", BEFORE_STYLE_4);
-
-	Tokenizer.prototype._stateBeforeStyle4 = function(c){
-		if(c === "/" || c === ">" || whitespace(c)){
-			this._special = SPECIAL_STYLE;
-		}
-		this._state = IN_TAG_NAME;
-		this._index--; //consume the token again
-	};
-
-	Tokenizer.prototype._stateAfterStyle1 = ifElseState("Y", AFTER_STYLE_2, TEXT);
-	Tokenizer.prototype._stateAfterStyle2 = ifElseState("L", AFTER_STYLE_3, TEXT);
-	Tokenizer.prototype._stateAfterStyle3 = ifElseState("E", AFTER_STYLE_4, TEXT);
-
-	Tokenizer.prototype._stateAfterStyle4 = function(c){
-		if(c === ">" || whitespace(c)){
-			this._special = SPECIAL_NONE;
-			this._state = IN_CLOSING_TAG_NAME;
-			this._sectionStart = this._index - 5;
-			this._index--; //reconsume the token
-		}
-		else this._state = TEXT;
-	};
-
-	Tokenizer.prototype._stateBeforeEntity = ifElseState("#", BEFORE_NUMERIC_ENTITY, IN_NAMED_ENTITY);
-	Tokenizer.prototype._stateBeforeNumericEntity = ifElseState("X", IN_HEX_ENTITY, IN_NUMERIC_ENTITY);
-
-	//for entities terminated with a semicolon
-	Tokenizer.prototype._parseNamedEntityStrict = function(){
-		//offset = 1
-		if(this._sectionStart + 1 < this._index){
-			var entity = this._buffer.substring(this._sectionStart + 1, this._index),
-			    map = this._xmlMode ? xmlMap : entityMap;
-
-			if(map.hasOwnProperty(entity)){
-				this._emitPartial(map[entity]);
-				this._sectionStart = this._index + 1;
-			}
-		}
-	};
-
-
-	//parses legacy entities (without trailing semicolon)
-	Tokenizer.prototype._parseLegacyEntity = function(){
-		var start = this._sectionStart + 1,
-		    limit = this._index - start;
-
-		if(limit > 6) limit = 6; //the max length of legacy entities is 6
-
-		while(limit >= 2){ //the min length of legacy entities is 2
-			var entity = this._buffer.substr(start, limit);
-
-			if(legacyMap.hasOwnProperty(entity)){
-				this._emitPartial(legacyMap[entity]);
-				this._sectionStart += limit + 1;
-				return;
-			} else {
-				limit--;
-			}
-		}
-	};
-
-	Tokenizer.prototype._stateInNamedEntity = function(c){
-		if(c === ";"){
-			this._parseNamedEntityStrict();
-			if(this._sectionStart + 1 < this._index && !this._xmlMode){
-				this._parseLegacyEntity();
-			}
-			this._state = this._baseState;
-		} else if((c < "a" || c > "z") && (c < "A" || c > "Z") && (c < "0" || c > "9")){
-			if(this._xmlMode);
-			else if(this._sectionStart + 1 === this._index);
-			else if(this._baseState !== TEXT){
-				if(c !== "="){
-					this._parseNamedEntityStrict();
-				}
-			} else {
-				this._parseLegacyEntity();
-			}
-
-			this._state = this._baseState;
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._decodeNumericEntity = function(offset, base){
-		var sectionStart = this._sectionStart + offset;
-
-		if(sectionStart !== this._index){
-			//parse entity
-			var entity = this._buffer.substring(sectionStart, this._index);
-			var parsed = parseInt(entity, base);
-
-			this._emitPartial(decodeCodePoint(parsed));
-			this._sectionStart = this._index;
-		} else {
-			this._sectionStart--;
-		}
-
-		this._state = this._baseState;
-	};
-
-	Tokenizer.prototype._stateInNumericEntity = function(c){
-		if(c === ";"){
-			this._decodeNumericEntity(2, 10);
-			this._sectionStart++;
-		} else if(c < "0" || c > "9"){
-			if(!this._xmlMode){
-				this._decodeNumericEntity(2, 10);
-			} else {
-				this._state = this._baseState;
-			}
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._stateInHexEntity = function(c){
-		if(c === ";"){
-			this._decodeNumericEntity(3, 16);
-			this._sectionStart++;
-		} else if((c < "a" || c > "f") && (c < "A" || c > "F") && (c < "0" || c > "9")){
-			if(!this._xmlMode){
-				this._decodeNumericEntity(3, 16);
-			} else {
-				this._state = this._baseState;
-			}
-			this._index--;
-		}
-	};
-
-	Tokenizer.prototype._cleanup = function (){
-		if(this._sectionStart < 0){
-			this._buffer = "";
-			this._index = 0;
-			this._bufferOffset += this._index;
-		} else if(this._running){
-			if(this._state === TEXT){
-				if(this._sectionStart !== this._index){
-					this._cbs.ontext(this._buffer.substr(this._sectionStart));
-				}
-				this._buffer = "";
-				this._index = 0;
-				this._bufferOffset += this._index;
-			} else if(this._sectionStart === this._index){
-				//the section just started
-				this._buffer = "";
-				this._index = 0;
-				this._bufferOffset += this._index;
-			} else {
-				//remove everything unnecessary
-				this._buffer = this._buffer.substr(this._sectionStart);
-				this._index -= this._sectionStart;
-				this._bufferOffset += this._sectionStart;
-			}
-
-			this._sectionStart = 0;
-		}
-	};
-
-	//TODO make events conditional
-	Tokenizer.prototype.write = function(chunk){
-		if(this._ended) this._cbs.onerror(Error(".write() after done!"));
-
-		this._buffer += chunk;
-		this._parse();
-	};
-
-	Tokenizer.prototype._parse = function(){
-		while(this._index < this._buffer.length && this._running){
-			var c = this._buffer.charAt(this._index);
-			if(this._state === TEXT) {
-				this._stateText(c);
-			} else if(this._state === BEFORE_TAG_NAME){
-				this._stateBeforeTagName(c);
-			} else if(this._state === IN_TAG_NAME) {
-				this._stateInTagName(c);
-			} else if(this._state === BEFORE_CLOSING_TAG_NAME){
-				this._stateBeforeCloseingTagName(c);
-			} else if(this._state === IN_CLOSING_TAG_NAME){
-				this._stateInCloseingTagName(c);
-			} else if(this._state === AFTER_CLOSING_TAG_NAME){
-				this._stateAfterCloseingTagName(c);
-			} else if(this._state === IN_SELF_CLOSING_TAG){
-				this._stateInSelfClosingTag(c);
-			}
-
-			/*
-			*	attributes
-			*/
-			else if(this._state === BEFORE_ATTRIBUTE_NAME){
-				this._stateBeforeAttributeName(c);
-			} else if(this._state === IN_ATTRIBUTE_NAME){
-				this._stateInAttributeName(c);
-			} else if(this._state === AFTER_ATTRIBUTE_NAME){
-				this._stateAfterAttributeName(c);
-			} else if(this._state === BEFORE_ATTRIBUTE_VALUE){
-				this._stateBeforeAttributeValue(c);
-			} else if(this._state === IN_ATTRIBUTE_VALUE_DQ){
-				this._stateInAttributeValueDoubleQuotes(c);
-			} else if(this._state === IN_ATTRIBUTE_VALUE_SQ){
-				this._stateInAttributeValueSingleQuotes(c);
-			} else if(this._state === IN_ATTRIBUTE_VALUE_NQ){
-				this._stateInAttributeValueNoQuotes(c);
-			}
-
-			/*
-			*	declarations
-			*/
-			else if(this._state === BEFORE_DECLARATION){
-				this._stateBeforeDeclaration(c);
-			} else if(this._state === IN_DECLARATION){
-				this._stateInDeclaration(c);
-			}
-
-			/*
-			*	processing instructions
-			*/
-			else if(this._state === IN_PROCESSING_INSTRUCTION){
-				this._stateInProcessingInstruction(c);
-			}
-
-			/*
-			*	comments
-			*/
-			else if(this._state === BEFORE_COMMENT){
-				this._stateBeforeComment(c);
-			} else if(this._state === IN_COMMENT){
-				this._stateInComment(c);
-			} else if(this._state === AFTER_COMMENT_1){
-				this._stateAfterComment1(c);
-			} else if(this._state === AFTER_COMMENT_2){
-				this._stateAfterComment2(c);
-			}
-
-			/*
-			*	cdata
-			*/
-			else if(this._state === BEFORE_CDATA_1){
-				this._stateBeforeCdata1(c);
-			} else if(this._state === BEFORE_CDATA_2){
-				this._stateBeforeCdata2(c);
-			} else if(this._state === BEFORE_CDATA_3){
-				this._stateBeforeCdata3(c);
-			} else if(this._state === BEFORE_CDATA_4){
-				this._stateBeforeCdata4(c);
-			} else if(this._state === BEFORE_CDATA_5){
-				this._stateBeforeCdata5(c);
-			} else if(this._state === BEFORE_CDATA_6){
-				this._stateBeforeCdata6(c);
-			} else if(this._state === IN_CDATA){
-				this._stateInCdata(c);
-			} else if(this._state === AFTER_CDATA_1){
-				this._stateAfterCdata1(c);
-			} else if(this._state === AFTER_CDATA_2){
-				this._stateAfterCdata2(c);
-			}
-
-			/*
-			* special tags
-			*/
-			else if(this._state === BEFORE_SPECIAL){
-				this._stateBeforeSpecial(c);
-			} else if(this._state === BEFORE_SPECIAL_END){
-				this._stateBeforeSpecialEnd(c);
-			}
-
-			/*
-			* script
-			*/
-			else if(this._state === BEFORE_SCRIPT_1){
-				this._stateBeforeScript1(c);
-			} else if(this._state === BEFORE_SCRIPT_2){
-				this._stateBeforeScript2(c);
-			} else if(this._state === BEFORE_SCRIPT_3){
-				this._stateBeforeScript3(c);
-			} else if(this._state === BEFORE_SCRIPT_4){
-				this._stateBeforeScript4(c);
-			} else if(this._state === BEFORE_SCRIPT_5){
-				this._stateBeforeScript5(c);
-			}
-
-			else if(this._state === AFTER_SCRIPT_1){
-				this._stateAfterScript1(c);
-			} else if(this._state === AFTER_SCRIPT_2){
-				this._stateAfterScript2(c);
-			} else if(this._state === AFTER_SCRIPT_3){
-				this._stateAfterScript3(c);
-			} else if(this._state === AFTER_SCRIPT_4){
-				this._stateAfterScript4(c);
-			} else if(this._state === AFTER_SCRIPT_5){
-				this._stateAfterScript5(c);
-			}
-
-			/*
-			* style
-			*/
-			else if(this._state === BEFORE_STYLE_1){
-				this._stateBeforeStyle1(c);
-			} else if(this._state === BEFORE_STYLE_2){
-				this._stateBeforeStyle2(c);
-			} else if(this._state === BEFORE_STYLE_3){
-				this._stateBeforeStyle3(c);
-			} else if(this._state === BEFORE_STYLE_4){
-				this._stateBeforeStyle4(c);
-			}
-
-			else if(this._state === AFTER_STYLE_1){
-				this._stateAfterStyle1(c);
-			} else if(this._state === AFTER_STYLE_2){
-				this._stateAfterStyle2(c);
-			} else if(this._state === AFTER_STYLE_3){
-				this._stateAfterStyle3(c);
-			} else if(this._state === AFTER_STYLE_4){
-				this._stateAfterStyle4(c);
-			}
-
-			/*
-			* entities
-			*/
-			else if(this._state === BEFORE_ENTITY){
-				this._stateBeforeEntity(c);
-			} else if(this._state === BEFORE_NUMERIC_ENTITY){
-				this._stateBeforeNumericEntity(c);
-			} else if(this._state === IN_NAMED_ENTITY){
-				this._stateInNamedEntity(c);
-			} else if(this._state === IN_NUMERIC_ENTITY){
-				this._stateInNumericEntity(c);
-			} else if(this._state === IN_HEX_ENTITY){
-				this._stateInHexEntity(c);
-			}
-
-			else {
-				this._cbs.onerror(Error("unknown _state"), this._state);
-			}
-
-			this._index++;
-		}
-
-		this._cleanup();
-	};
-
-	Tokenizer.prototype.pause = function(){
-		this._running = false;
-	};
-	Tokenizer.prototype.resume = function(){
-		this._running = true;
-
-		if(this._index < this._buffer.length){
-			this._parse();
-		}
-		if(this._ended){
-			this._finish();
-		}
-	};
-
-	Tokenizer.prototype.end = function(chunk){
-		if(this._ended) this._cbs.onerror(Error(".end() after done!"));
-		if(chunk) this.write(chunk);
-
-		this._ended = true;
-
-		if(this._running) this._finish();
-	};
-
-	Tokenizer.prototype._finish = function(){
-		//if there is remaining data, emit it in a reasonable way
-		if(this._sectionStart < this._index){
-			this._handleTrailingData();
-		}
-
-		this._cbs.onend();
-	};
-
-	Tokenizer.prototype._handleTrailingData = function(){
-		var data = this._buffer.substr(this._sectionStart);
-
-		if(this._state === IN_CDATA || this._state === AFTER_CDATA_1 || this._state === AFTER_CDATA_2){
-			this._cbs.oncdata(data);
-		} else if(this._state === IN_COMMENT || this._state === AFTER_COMMENT_1 || this._state === AFTER_COMMENT_2){
-			this._cbs.oncomment(data);
-		} else if(this._state === IN_NAMED_ENTITY && !this._xmlMode){
-			this._parseLegacyEntity();
-			if(this._sectionStart < this._index){
-				this._state = this._baseState;
-				this._handleTrailingData();
-			}
-		} else if(this._state === IN_NUMERIC_ENTITY && !this._xmlMode){
-			this._decodeNumericEntity(2, 10);
-			if(this._sectionStart < this._index){
-				this._state = this._baseState;
-				this._handleTrailingData();
-			}
-		} else if(this._state === IN_HEX_ENTITY && !this._xmlMode){
-			this._decodeNumericEntity(3, 16);
-			if(this._sectionStart < this._index){
-				this._state = this._baseState;
-				this._handleTrailingData();
-			}
-		} else if(
-			this._state !== IN_TAG_NAME &&
-			this._state !== BEFORE_ATTRIBUTE_NAME &&
-			this._state !== BEFORE_ATTRIBUTE_VALUE &&
-			this._state !== AFTER_ATTRIBUTE_NAME &&
-			this._state !== IN_ATTRIBUTE_NAME &&
-			this._state !== IN_ATTRIBUTE_VALUE_SQ &&
-			this._state !== IN_ATTRIBUTE_VALUE_DQ &&
-			this._state !== IN_ATTRIBUTE_VALUE_NQ &&
-			this._state !== IN_CLOSING_TAG_NAME
-		){
-			this._cbs.ontext(data);
-		}
-		//else, ignore remaining data
-		//TODO add a way to remove current tag
-	};
-
-	Tokenizer.prototype.reset = function(){
-		Tokenizer.call(this, {xmlMode: this._xmlMode, decodeEntities: this._decodeEntities}, this._cbs);
-	};
-
-	Tokenizer.prototype.getAbsoluteIndex = function(){
-		return this._bufferOffset + this._index;
-	};
-
-	Tokenizer.prototype._getSection = function(){
-		return this._buffer.substring(this._sectionStart, this._index);
-	};
-
-	Tokenizer.prototype._emitToken = function(name){
-		this._cbs[name](this._getSection());
-		this._sectionStart = -1;
-	};
-
-	Tokenizer.prototype._emitPartial = function(value){
-		if(this._baseState !== TEXT){
-			this._cbs.onattribdata(value); //TODO implement the new event
-		} else {
-			this._cbs.ontext(value);
-		}
-	};
-
-
-/***/ },
-/* 17 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var decodeMap = __webpack_require__(18);
-
-	module.exports = decodeCodePoint;
-
-	// modified version of https://github.com/mathiasbynens/he/blob/master/src/he.js#L94-L119
-	function decodeCodePoint(codePoint){
-
-		if((codePoint >= 0xD800 && codePoint <= 0xDFFF) || codePoint > 0x10FFFF){
-			return "\uFFFD";
-		}
-
-		if(codePoint in decodeMap){
-			codePoint = decodeMap[codePoint];
-		}
-
-		var output = "";
-
-		if(codePoint > 0xFFFF){
-			codePoint -= 0x10000;
-			output += String.fromCharCode(codePoint >>> 10 & 0x3FF | 0xD800);
-			codePoint = 0xDC00 | codePoint & 0x3FF;
-		}
-
-		output += String.fromCharCode(codePoint);
-		return output;
-	}
-
-
-/***/ },
-/* 18 */
-/***/ function(module, exports) {
-
-	module.exports = {
-		"0": 65533,
-		"128": 8364,
-		"130": 8218,
-		"131": 402,
-		"132": 8222,
-		"133": 8230,
-		"134": 8224,
-		"135": 8225,
-		"136": 710,
-		"137": 8240,
-		"138": 352,
-		"139": 8249,
-		"140": 338,
-		"142": 381,
-		"145": 8216,
-		"146": 8217,
-		"147": 8220,
-		"148": 8221,
-		"149": 8226,
-		"150": 8211,
-		"151": 8212,
-		"152": 732,
-		"153": 8482,
-		"154": 353,
-		"155": 8250,
-		"156": 339,
-		"158": 382,
-		"159": 376
-	};
-
-/***/ },
-/* 19 */
-/***/ function(module, exports) {
-
-	module.exports = {
-		"Aacute": "Á",
-		"aacute": "á",
-		"Abreve": "Ă",
-		"abreve": "ă",
-		"ac": "∾",
-		"acd": "∿",
-		"acE": "∾̳",
-		"Acirc": "Â",
-		"acirc": "â",
-		"acute": "´",
-		"Acy": "А",
-		"acy": "а",
-		"AElig": "Æ",
-		"aelig": "æ",
-		"af": "⁡",
-		"Afr": "𝔄",
-		"afr": "𝔞",
-		"Agrave": "À",
-		"agrave": "à",
-		"alefsym": "ℵ",
-		"aleph": "ℵ",
-		"Alpha": "Α",
-		"alpha": "α",
-		"Amacr": "Ā",
-		"amacr": "ā",
-		"amalg": "⨿",
-		"amp": "&",
-		"AMP": "&",
-		"andand": "⩕",
-		"And": "⩓",
-		"and": "∧",
-		"andd": "⩜",
-		"andslope": "⩘",
-		"andv": "⩚",
-		"ang": "∠",
-		"ange": "⦤",
-		"angle": "∠",
-		"angmsdaa": "⦨",
-		"angmsdab": "⦩",
-		"angmsdac": "⦪",
-		"angmsdad": "⦫",
-		"angmsdae": "⦬",
-		"angmsdaf": "⦭",
-		"angmsdag": "⦮",
-		"angmsdah": "⦯",
-		"angmsd": "∡",
-		"angrt": "∟",
-		"angrtvb": "⊾",
-		"angrtvbd": "⦝",
-		"angsph": "∢",
-		"angst": "Å",
-		"angzarr": "⍼",
-		"Aogon": "Ą",
-		"aogon": "ą",
-		"Aopf": "𝔸",
-		"aopf": "𝕒",
-		"apacir": "⩯",
-		"ap": "≈",
-		"apE": "⩰",
-		"ape": "≊",
-		"apid": "≋",
-		"apos": "'",
-		"ApplyFunction": "⁡",
-		"approx": "≈",
-		"approxeq": "≊",
-		"Aring": "Å",
-		"aring": "å",
-		"Ascr": "𝒜",
-		"ascr": "𝒶",
-		"Assign": "≔",
-		"ast": "*",
-		"asymp": "≈",
-		"asympeq": "≍",
-		"Atilde": "Ã",
-		"atilde": "ã",
-		"Auml": "Ä",
-		"auml": "ä",
-		"awconint": "∳",
-		"awint": "⨑",
-		"backcong": "≌",
-		"backepsilon": "϶",
-		"backprime": "‵",
-		"backsim": "∽",
-		"backsimeq": "⋍",
-		"Backslash": "∖",
-		"Barv": "⫧",
-		"barvee": "⊽",
-		"barwed": "⌅",
-		"Barwed": "⌆",
-		"barwedge": "⌅",
-		"bbrk": "⎵",
-		"bbrktbrk": "⎶",
-		"bcong": "≌",
-		"Bcy": "Б",
-		"bcy": "б",
-		"bdquo": "„",
-		"becaus": "∵",
-		"because": "∵",
-		"Because": "∵",
-		"bemptyv": "⦰",
-		"bepsi": "϶",
-		"bernou": "ℬ",
-		"Bernoullis": "ℬ",
-		"Beta": "Β",
-		"beta": "β",
-		"beth": "ℶ",
-		"between": "≬",
-		"Bfr": "𝔅",
-		"bfr": "𝔟",
-		"bigcap": "⋂",
-		"bigcirc": "◯",
-		"bigcup": "⋃",
-		"bigodot": "⨀",
-		"bigoplus": "⨁",
-		"bigotimes": "⨂",
-		"bigsqcup": "⨆",
-		"bigstar": "★",
-		"bigtriangledown": "▽",
-		"bigtriangleup": "△",
-		"biguplus": "⨄",
-		"bigvee": "⋁",
-		"bigwedge": "⋀",
-		"bkarow": "⤍",
-		"blacklozenge": "⧫",
-		"blacksquare": "▪",
-		"blacktriangle": "▴",
-		"blacktriangledown": "▾",
-		"blacktriangleleft": "◂",
-		"blacktriangleright": "▸",
-		"blank": "␣",
-		"blk12": "▒",
-		"blk14": "░",
-		"blk34": "▓",
-		"block": "█",
-		"bne": "=⃥",
-		"bnequiv": "≡⃥",
-		"bNot": "⫭",
-		"bnot": "⌐",
-		"Bopf": "𝔹",
-		"bopf": "𝕓",
-		"bot": "⊥",
-		"bottom": "⊥",
-		"bowtie": "⋈",
-		"boxbox": "⧉",
-		"boxdl": "┐",
-		"boxdL": "╕",
-		"boxDl": "╖",
-		"boxDL": "╗",
-		"boxdr": "┌",
-		"boxdR": "╒",
-		"boxDr": "╓",
-		"boxDR": "╔",
-		"boxh": "─",
-		"boxH": "═",
-		"boxhd": "┬",
-		"boxHd": "╤",
-		"boxhD": "╥",
-		"boxHD": "╦",
-		"boxhu": "┴",
-		"boxHu": "╧",
-		"boxhU": "╨",
-		"boxHU": "╩",
-		"boxminus": "⊟",
-		"boxplus": "⊞",
-		"boxtimes": "⊠",
-		"boxul": "┘",
-		"boxuL": "╛",
-		"boxUl": "╜",
-		"boxUL": "╝",
-		"boxur": "└",
-		"boxuR": "╘",
-		"boxUr": "╙",
-		"boxUR": "╚",
-		"boxv": "│",
-		"boxV": "║",
-		"boxvh": "┼",
-		"boxvH": "╪",
-		"boxVh": "╫",
-		"boxVH": "╬",
-		"boxvl": "┤",
-		"boxvL": "╡",
-		"boxVl": "╢",
-		"boxVL": "╣",
-		"boxvr": "├",
-		"boxvR": "╞",
-		"boxVr": "╟",
-		"boxVR": "╠",
-		"bprime": "‵",
-		"breve": "˘",
-		"Breve": "˘",
-		"brvbar": "¦",
-		"bscr": "𝒷",
-		"Bscr": "ℬ",
-		"bsemi": "⁏",
-		"bsim": "∽",
-		"bsime": "⋍",
-		"bsolb": "⧅",
-		"bsol": "\\",
-		"bsolhsub": "⟈",
-		"bull": "•",
-		"bullet": "•",
-		"bump": "≎",
-		"bumpE": "⪮",
-		"bumpe": "≏",
-		"Bumpeq": "≎",
-		"bumpeq": "≏",
-		"Cacute": "Ć",
-		"cacute": "ć",
-		"capand": "⩄",
-		"capbrcup": "⩉",
-		"capcap": "⩋",
-		"cap": "∩",
-		"Cap": "⋒",
-		"capcup": "⩇",
-		"capdot": "⩀",
-		"CapitalDifferentialD": "ⅅ",
-		"caps": "∩︀",
-		"caret": "⁁",
-		"caron": "ˇ",
-		"Cayleys": "ℭ",
-		"ccaps": "⩍",
-		"Ccaron": "Č",
-		"ccaron": "č",
-		"Ccedil": "Ç",
-		"ccedil": "ç",
-		"Ccirc": "Ĉ",
-		"ccirc": "ĉ",
-		"Cconint": "∰",
-		"ccups": "⩌",
-		"ccupssm": "⩐",
-		"Cdot": "Ċ",
-		"cdot": "ċ",
-		"cedil": "¸",
-		"Cedilla": "¸",
-		"cemptyv": "⦲",
-		"cent": "¢",
-		"centerdot": "·",
-		"CenterDot": "·",
-		"cfr": "𝔠",
-		"Cfr": "ℭ",
-		"CHcy": "Ч",
-		"chcy": "ч",
-		"check": "✓",
-		"checkmark": "✓",
-		"Chi": "Χ",
-		"chi": "χ",
-		"circ": "ˆ",
-		"circeq": "≗",
-		"circlearrowleft": "↺",
-		"circlearrowright": "↻",
-		"circledast": "⊛",
-		"circledcirc": "⊚",
-		"circleddash": "⊝",
-		"CircleDot": "⊙",
-		"circledR": "®",
-		"circledS": "Ⓢ",
-		"CircleMinus": "⊖",
-		"CirclePlus": "⊕",
-		"CircleTimes": "⊗",
-		"cir": "○",
-		"cirE": "⧃",
-		"cire": "≗",
-		"cirfnint": "⨐",
-		"cirmid": "⫯",
-		"cirscir": "⧂",
-		"ClockwiseContourIntegral": "∲",
-		"CloseCurlyDoubleQuote": "”",
-		"CloseCurlyQuote": "’",
-		"clubs": "♣",
-		"clubsuit": "♣",
-		"colon": ":",
-		"Colon": "∷",
-		"Colone": "⩴",
-		"colone": "≔",
-		"coloneq": "≔",
-		"comma": ",",
-		"commat": "@",
-		"comp": "∁",
-		"compfn": "∘",
-		"complement": "∁",
-		"complexes": "ℂ",
-		"cong": "≅",
-		"congdot": "⩭",
-		"Congruent": "≡",
-		"conint": "∮",
-		"Conint": "∯",
-		"ContourIntegral": "∮",
-		"copf": "𝕔",
-		"Copf": "ℂ",
-		"coprod": "∐",
-		"Coproduct": "∐",
-		"copy": "©",
-		"COPY": "©",
-		"copysr": "℗",
-		"CounterClockwiseContourIntegral": "∳",
-		"crarr": "↵",
-		"cross": "✗",
-		"Cross": "⨯",
-		"Cscr": "𝒞",
-		"cscr": "𝒸",
-		"csub": "⫏",
-		"csube": "⫑",
-		"csup": "⫐",
-		"csupe": "⫒",
-		"ctdot": "⋯",
-		"cudarrl": "⤸",
-		"cudarrr": "⤵",
-		"cuepr": "⋞",
-		"cuesc": "⋟",
-		"cularr": "↶",
-		"cularrp": "⤽",
-		"cupbrcap": "⩈",
-		"cupcap": "⩆",
-		"CupCap": "≍",
-		"cup": "∪",
-		"Cup": "⋓",
-		"cupcup": "⩊",
-		"cupdot": "⊍",
-		"cupor": "⩅",
-		"cups": "∪︀",
-		"curarr": "↷",
-		"curarrm": "⤼",
-		"curlyeqprec": "⋞",
-		"curlyeqsucc": "⋟",
-		"curlyvee": "⋎",
-		"curlywedge": "⋏",
-		"curren": "¤",
-		"curvearrowleft": "↶",
-		"curvearrowright": "↷",
-		"cuvee": "⋎",
-		"cuwed": "⋏",
-		"cwconint": "∲",
-		"cwint": "∱",
-		"cylcty": "⌭",
-		"dagger": "†",
-		"Dagger": "‡",
-		"daleth": "ℸ",
-		"darr": "↓",
-		"Darr": "↡",
-		"dArr": "⇓",
-		"dash": "‐",
-		"Dashv": "⫤",
-		"dashv": "⊣",
-		"dbkarow": "⤏",
-		"dblac": "˝",
-		"Dcaron": "Ď",
-		"dcaron": "ď",
-		"Dcy": "Д",
-		"dcy": "д",
-		"ddagger": "‡",
-		"ddarr": "⇊",
-		"DD": "ⅅ",
-		"dd": "ⅆ",
-		"DDotrahd": "⤑",
-		"ddotseq": "⩷",
-		"deg": "°",
-		"Del": "∇",
-		"Delta": "Δ",
-		"delta": "δ",
-		"demptyv": "⦱",
-		"dfisht": "⥿",
-		"Dfr": "𝔇",
-		"dfr": "𝔡",
-		"dHar": "⥥",
-		"dharl": "⇃",
-		"dharr": "⇂",
-		"DiacriticalAcute": "´",
-		"DiacriticalDot": "˙",
-		"DiacriticalDoubleAcute": "˝",
-		"DiacriticalGrave": "`",
-		"DiacriticalTilde": "˜",
-		"diam": "⋄",
-		"diamond": "⋄",
-		"Diamond": "⋄",
-		"diamondsuit": "♦",
-		"diams": "♦",
-		"die": "¨",
-		"DifferentialD": "ⅆ",
-		"digamma": "ϝ",
-		"disin": "⋲",
-		"div": "÷",
-		"divide": "÷",
-		"divideontimes": "⋇",
-		"divonx": "⋇",
-		"DJcy": "Ђ",
-		"djcy": "ђ",
-		"dlcorn": "⌞",
-		"dlcrop": "⌍",
-		"dollar": "$",
-		"Dopf": "𝔻",
-		"dopf": "𝕕",
-		"Dot": "¨",
-		"dot": "˙",
-		"DotDot": "⃜",
-		"doteq": "≐",
-		"doteqdot": "≑",
-		"DotEqual": "≐",
-		"dotminus": "∸",
-		"dotplus": "∔",
-		"dotsquare": "⊡",
-		"doublebarwedge": "⌆",
-		"DoubleContourIntegral": "∯",
-		"DoubleDot": "¨",
-		"DoubleDownArrow": "⇓",
-		"DoubleLeftArrow": "⇐",
-		"DoubleLeftRightArrow": "⇔",
-		"DoubleLeftTee": "⫤",
-		"DoubleLongLeftArrow": "⟸",
-		"DoubleLongLeftRightArrow": "⟺",
-		"DoubleLongRightArrow": "⟹",
-		"DoubleRightArrow": "⇒",
-		"DoubleRightTee": "⊨",
-		"DoubleUpArrow": "⇑",
-		"DoubleUpDownArrow": "⇕",
-		"DoubleVerticalBar": "∥",
-		"DownArrowBar": "⤓",
-		"downarrow": "↓",
-		"DownArrow": "↓",
-		"Downarrow": "⇓",
-		"DownArrowUpArrow": "⇵",
-		"DownBreve": "̑",
-		"downdownarrows": "⇊",
-		"downharpoonleft": "⇃",
-		"downharpoonright": "⇂",
-		"DownLeftRightVector": "⥐",
-		"DownLeftTeeVector": "⥞",
-		"DownLeftVectorBar": "⥖",
-		"DownLeftVector": "↽",
-		"DownRightTeeVector": "⥟",
-		"DownRightVectorBar": "⥗",
-		"DownRightVector": "⇁",
-		"DownTeeArrow": "↧",
-		"DownTee": "⊤",
-		"drbkarow": "⤐",
-		"drcorn": "⌟",
-		"drcrop": "⌌",
-		"Dscr": "𝒟",
-		"dscr": "𝒹",
-		"DScy": "Ѕ",
-		"dscy": "ѕ",
-		"dsol": "⧶",
-		"Dstrok": "Đ",
-		"dstrok": "đ",
-		"dtdot": "⋱",
-		"dtri": "▿",
-		"dtrif": "▾",
-		"duarr": "⇵",
-		"duhar": "⥯",
-		"dwangle": "⦦",
-		"DZcy": "Џ",
-		"dzcy": "џ",
-		"dzigrarr": "⟿",
-		"Eacute": "É",
-		"eacute": "é",
-		"easter": "⩮",
-		"Ecaron": "Ě",
-		"ecaron": "ě",
-		"Ecirc": "Ê",
-		"ecirc": "ê",
-		"ecir": "≖",
-		"ecolon": "≕",
-		"Ecy": "Э",
-		"ecy": "э",
-		"eDDot": "⩷",
-		"Edot": "Ė",
-		"edot": "ė",
-		"eDot": "≑",
-		"ee": "ⅇ",
-		"efDot": "≒",
-		"Efr": "𝔈",
-		"efr": "𝔢",
-		"eg": "⪚",
-		"Egrave": "È",
-		"egrave": "è",
-		"egs": "⪖",
-		"egsdot": "⪘",
-		"el": "⪙",
-		"Element": "∈",
-		"elinters": "⏧",
-		"ell": "ℓ",
-		"els": "⪕",
-		"elsdot": "⪗",
-		"Emacr": "Ē",
-		"emacr": "ē",
-		"empty": "∅",
-		"emptyset": "∅",
-		"EmptySmallSquare": "◻",
-		"emptyv": "∅",
-		"EmptyVerySmallSquare": "▫",
-		"emsp13": " ",
-		"emsp14": " ",
-		"emsp": " ",
-		"ENG": "Ŋ",
-		"eng": "ŋ",
-		"ensp": " ",
-		"Eogon": "Ę",
-		"eogon": "ę",
-		"Eopf": "𝔼",
-		"eopf": "𝕖",
-		"epar": "⋕",
-		"eparsl": "⧣",
-		"eplus": "⩱",
-		"epsi": "ε",
-		"Epsilon": "Ε",
-		"epsilon": "ε",
-		"epsiv": "ϵ",
-		"eqcirc": "≖",
-		"eqcolon": "≕",
-		"eqsim": "≂",
-		"eqslantgtr": "⪖",
-		"eqslantless": "⪕",
-		"Equal": "⩵",
-		"equals": "=",
-		"EqualTilde": "≂",
-		"equest": "≟",
-		"Equilibrium": "⇌",
-		"equiv": "≡",
-		"equivDD": "⩸",
-		"eqvparsl": "⧥",
-		"erarr": "⥱",
-		"erDot": "≓",
-		"escr": "ℯ",
-		"Escr": "ℰ",
-		"esdot": "≐",
-		"Esim": "⩳",
-		"esim": "≂",
-		"Eta": "Η",
-		"eta": "η",
-		"ETH": "Ð",
-		"eth": "ð",
-		"Euml": "Ë",
-		"euml": "ë",
-		"euro": "€",
-		"excl": "!",
-		"exist": "∃",
-		"Exists": "∃",
-		"expectation": "ℰ",
-		"exponentiale": "ⅇ",
-		"ExponentialE": "ⅇ",
-		"fallingdotseq": "≒",
-		"Fcy": "Ф",
-		"fcy": "ф",
-		"female": "♀",
-		"ffilig": "ffi",
-		"fflig": "ff",
-		"ffllig": "ffl",
-		"Ffr": "𝔉",
-		"ffr": "𝔣",
-		"filig": "fi",
-		"FilledSmallSquare": "◼",
-		"FilledVerySmallSquare": "▪",
-		"fjlig": "fj",
-		"flat": "♭",
-		"fllig": "fl",
-		"fltns": "▱",
-		"fnof": "ƒ",
-		"Fopf": "𝔽",
-		"fopf": "𝕗",
-		"forall": "∀",
-		"ForAll": "∀",
-		"fork": "⋔",
-		"forkv": "⫙",
-		"Fouriertrf": "ℱ",
-		"fpartint": "⨍",
-		"frac12": "½",
-		"frac13": "⅓",
-		"frac14": "¼",
-		"frac15": "⅕",
-		"frac16": "⅙",
-		"frac18": "⅛",
-		"frac23": "⅔",
-		"frac25": "⅖",
-		"frac34": "¾",
-		"frac35": "⅗",
-		"frac38": "⅜",
-		"frac45": "⅘",
-		"frac56": "⅚",
-		"frac58": "⅝",
-		"frac78": "⅞",
-		"frasl": "⁄",
-		"frown": "⌢",
-		"fscr": "𝒻",
-		"Fscr": "ℱ",
-		"gacute": "ǵ",
-		"Gamma": "Γ",
-		"gamma": "γ",
-		"Gammad": "Ϝ",
-		"gammad": "ϝ",
-		"gap": "⪆",
-		"Gbreve": "Ğ",
-		"gbreve": "ğ",
-		"Gcedil": "Ģ",
-		"Gcirc": "Ĝ",
-		"gcirc": "ĝ",
-		"Gcy": "Г",
-		"gcy": "г",
-		"Gdot": "Ġ",
-		"gdot": "ġ",
-		"ge": "≥",
-		"gE": "≧",
-		"gEl": "⪌",
-		"gel": "⋛",
-		"geq": "≥",
-		"geqq": "≧",
-		"geqslant": "⩾",
-		"gescc": "⪩",
-		"ges": "⩾",
-		"gesdot": "⪀",
-		"gesdoto": "⪂",
-		"gesdotol": "⪄",
-		"gesl": "⋛︀",
-		"gesles": "⪔",
-		"Gfr": "𝔊",
-		"gfr": "𝔤",
-		"gg": "≫",
-		"Gg": "⋙",
-		"ggg": "⋙",
-		"gimel": "ℷ",
-		"GJcy": "Ѓ",
-		"gjcy": "ѓ",
-		"gla": "⪥",
-		"gl": "≷",
-		"glE": "⪒",
-		"glj": "⪤",
-		"gnap": "⪊",
-		"gnapprox": "⪊",
-		"gne": "⪈",
-		"gnE": "≩",
-		"gneq": "⪈",
-		"gneqq": "≩",
-		"gnsim": "⋧",
-		"Gopf": "𝔾",
-		"gopf": "𝕘",
-		"grave": "`",
-		"GreaterEqual": "≥",
-		"GreaterEqualLess": "⋛",
-		"GreaterFullEqual": "≧",
-		"GreaterGreater": "⪢",
-		"GreaterLess": "≷",
-		"GreaterSlantEqual": "⩾",
-		"GreaterTilde": "≳",
-		"Gscr": "𝒢",
-		"gscr": "ℊ",
-		"gsim": "≳",
-		"gsime": "⪎",
-		"gsiml": "⪐",
-		"gtcc": "⪧",
-		"gtcir": "⩺",
-		"gt": ">",
-		"GT": ">",
-		"Gt": "≫",
-		"gtdot": "⋗",
-		"gtlPar": "⦕",
-		"gtquest": "⩼",
-		"gtrapprox": "⪆",
-		"gtrarr": "⥸",
-		"gtrdot": "⋗",
-		"gtreqless": "⋛",
-		"gtreqqless": "⪌",
-		"gtrless": "≷",
-		"gtrsim": "≳",
-		"gvertneqq": "≩︀",
-		"gvnE": "≩︀",
-		"Hacek": "ˇ",
-		"hairsp": " ",
-		"half": "½",
-		"hamilt": "ℋ",
-		"HARDcy": "Ъ",
-		"hardcy": "ъ",
-		"harrcir": "⥈",
-		"harr": "↔",
-		"hArr": "⇔",
-		"harrw": "↭",
-		"Hat": "^",
-		"hbar": "ℏ",
-		"Hcirc": "Ĥ",
-		"hcirc": "ĥ",
-		"hearts": "♥",
-		"heartsuit": "♥",
-		"hellip": "…",
-		"hercon": "⊹",
-		"hfr": "𝔥",
-		"Hfr": "ℌ",
-		"HilbertSpace": "ℋ",
-		"hksearow": "⤥",
-		"hkswarow": "⤦",
-		"hoarr": "⇿",
-		"homtht": "∻",
-		"hookleftarrow": "↩",
-		"hookrightarrow": "↪",
-		"hopf": "𝕙",
-		"Hopf": "ℍ",
-		"horbar": "―",
-		"HorizontalLine": "─",
-		"hscr": "𝒽",
-		"Hscr": "ℋ",
-		"hslash": "ℏ",
-		"Hstrok": "Ħ",
-		"hstrok": "ħ",
-		"HumpDownHump": "≎",
-		"HumpEqual": "≏",
-		"hybull": "⁃",
-		"hyphen": "‐",
-		"Iacute": "Í",
-		"iacute": "í",
-		"ic": "⁣",
-		"Icirc": "Î",
-		"icirc": "î",
-		"Icy": "И",
-		"icy": "и",
-		"Idot": "İ",
-		"IEcy": "Е",
-		"iecy": "е",
-		"iexcl": "¡",
-		"iff": "⇔",
-		"ifr": "𝔦",
-		"Ifr": "ℑ",
-		"Igrave": "Ì",
-		"igrave": "ì",
-		"ii": "ⅈ",
-		"iiiint": "⨌",
-		"iiint": "∭",
-		"iinfin": "⧜",
-		"iiota": "℩",
-		"IJlig": "IJ",
-		"ijlig": "ij",
-		"Imacr": "Ī",
-		"imacr": "ī",
-		"image": "ℑ",
-		"ImaginaryI": "ⅈ",
-		"imagline": "ℐ",
-		"imagpart": "ℑ",
-		"imath": "ı",
-		"Im": "ℑ",
-		"imof": "⊷",
-		"imped": "Ƶ",
-		"Implies": "⇒",
-		"incare": "℅",
-		"in": "∈",
-		"infin": "∞",
-		"infintie": "⧝",
-		"inodot": "ı",
-		"intcal": "⊺",
-		"int": "∫",
-		"Int": "∬",
-		"integers": "ℤ",
-		"Integral": "∫",
-		"intercal": "⊺",
-		"Intersection": "⋂",
-		"intlarhk": "⨗",
-		"intprod": "⨼",
-		"InvisibleComma": "⁣",
-		"InvisibleTimes": "⁢",
-		"IOcy": "Ё",
-		"iocy": "ё",
-		"Iogon": "Į",
-		"iogon": "į",
-		"Iopf": "𝕀",
-		"iopf": "𝕚",
-		"Iota": "Ι",
-		"iota": "ι",
-		"iprod": "⨼",
-		"iquest": "¿",
-		"iscr": "𝒾",
-		"Iscr": "ℐ",
-		"isin": "∈",
-		"isindot": "⋵",
-		"isinE": "⋹",
-		"isins": "⋴",
-		"isinsv": "⋳",
-		"isinv": "∈",
-		"it": "⁢",
-		"Itilde": "Ĩ",
-		"itilde": "ĩ",
-		"Iukcy": "І",
-		"iukcy": "і",
-		"Iuml": "Ï",
-		"iuml": "ï",
-		"Jcirc": "Ĵ",
-		"jcirc": "ĵ",
-		"Jcy": "Й",
-		"jcy": "й",
-		"Jfr": "𝔍",
-		"jfr": "𝔧",
-		"jmath": "ȷ",
-		"Jopf": "𝕁",
-		"jopf": "𝕛",
-		"Jscr": "𝒥",
-		"jscr": "𝒿",
-		"Jsercy": "Ј",
-		"jsercy": "ј",
-		"Jukcy": "Є",
-		"jukcy": "є",
-		"Kappa": "Κ",
-		"kappa": "κ",
-		"kappav": "ϰ",
-		"Kcedil": "Ķ",
-		"kcedil": "ķ",
-		"Kcy": "К",
-		"kcy": "к",
-		"Kfr": "𝔎",
-		"kfr": "𝔨",
-		"kgreen": "ĸ",
-		"KHcy": "Х",
-		"khcy": "х",
-		"KJcy": "Ќ",
-		"kjcy": "ќ",
-		"Kopf": "𝕂",
-		"kopf": "𝕜",
-		"Kscr": "𝒦",
-		"kscr": "𝓀",
-		"lAarr": "⇚",
-		"Lacute": "Ĺ",
-		"lacute": "ĺ",
-		"laemptyv": "⦴",
-		"lagran": "ℒ",
-		"Lambda": "Λ",
-		"lambda": "λ",
-		"lang": "⟨",
-		"Lang": "⟪",
-		"langd": "⦑",
-		"langle": "⟨",
-		"lap": "⪅",
-		"Laplacetrf": "ℒ",
-		"laquo": "«",
-		"larrb": "⇤",
-		"larrbfs": "⤟",
-		"larr": "←",
-		"Larr": "↞",
-		"lArr": "⇐",
-		"larrfs": "⤝",
-		"larrhk": "↩",
-		"larrlp": "↫",
-		"larrpl": "⤹",
-		"larrsim": "⥳",
-		"larrtl": "↢",
-		"latail": "⤙",
-		"lAtail": "⤛",
-		"lat": "⪫",
-		"late": "⪭",
-		"lates": "⪭︀",
-		"lbarr": "⤌",
-		"lBarr": "⤎",
-		"lbbrk": "❲",
-		"lbrace": "{",
-		"lbrack": "[",
-		"lbrke": "⦋",
-		"lbrksld": "⦏",
-		"lbrkslu": "⦍",
-		"Lcaron": "Ľ",
-		"lcaron": "ľ",
-		"Lcedil": "Ļ",
-		"lcedil": "ļ",
-		"lceil": "⌈",
-		"lcub": "{",
-		"Lcy": "Л",
-		"lcy": "л",
-		"ldca": "⤶",
-		"ldquo": "“",
-		"ldquor": "„",
-		"ldrdhar": "⥧",
-		"ldrushar": "⥋",
-		"ldsh": "↲",
-		"le": "≤",
-		"lE": "≦",
-		"LeftAngleBracket": "⟨",
-		"LeftArrowBar": "⇤",
-		"leftarrow": "←",
-		"LeftArrow": "←",
-		"Leftarrow": "⇐",
-		"LeftArrowRightArrow": "⇆",
-		"leftarrowtail": "↢",
-		"LeftCeiling": "⌈",
-		"LeftDoubleBracket": "⟦",
-		"LeftDownTeeVector": "⥡",
-		"LeftDownVectorBar": "⥙",
-		"LeftDownVector": "⇃",
-		"LeftFloor": "⌊",
-		"leftharpoondown": "↽",
-		"leftharpoonup": "↼",
-		"leftleftarrows": "⇇",
-		"leftrightarrow": "↔",
-		"LeftRightArrow": "↔",
-		"Leftrightarrow": "⇔",
-		"leftrightarrows": "⇆",
-		"leftrightharpoons": "⇋",
-		"leftrightsquigarrow": "↭",
-		"LeftRightVector": "⥎",
-		"LeftTeeArrow": "↤",
-		"LeftTee": "⊣",
-		"LeftTeeVector": "⥚",
-		"leftthreetimes": "⋋",
-		"LeftTriangleBar": "⧏",
-		"LeftTriangle": "⊲",
-		"LeftTriangleEqual": "⊴",
-		"LeftUpDownVector": "⥑",
-		"LeftUpTeeVector": "⥠",
-		"LeftUpVectorBar": "⥘",
-		"LeftUpVector": "↿",
-		"LeftVectorBar": "⥒",
-		"LeftVector": "↼",
-		"lEg": "⪋",
-		"leg": "⋚",
-		"leq": "≤",
-		"leqq": "≦",
-		"leqslant": "⩽",
-		"lescc": "⪨",
-		"les": "⩽",
-		"lesdot": "⩿",
-		"lesdoto": "⪁",
-		"lesdotor": "⪃",
-		"lesg": "⋚︀",
-		"lesges": "⪓",
-		"lessapprox": "⪅",
-		"lessdot": "⋖",
-		"lesseqgtr": "⋚",
-		"lesseqqgtr": "⪋",
-		"LessEqualGreater": "⋚",
-		"LessFullEqual": "≦",
-		"LessGreater": "≶",
-		"lessgtr": "≶",
-		"LessLess": "⪡",
-		"lesssim": "≲",
-		"LessSlantEqual": "⩽",
-		"LessTilde": "≲",
-		"lfisht": "⥼",
-		"lfloor": "⌊",
-		"Lfr": "𝔏",
-		"lfr": "𝔩",
-		"lg": "≶",
-		"lgE": "⪑",
-		"lHar": "⥢",
-		"lhard": "↽",
-		"lharu": "↼",
-		"lharul": "⥪",
-		"lhblk": "▄",
-		"LJcy": "Љ",
-		"ljcy": "љ",
-		"llarr": "⇇",
-		"ll": "≪",
-		"Ll": "⋘",
-		"llcorner": "⌞",
-		"Lleftarrow": "⇚",
-		"llhard": "⥫",
-		"lltri": "◺",
-		"Lmidot": "Ŀ",
-		"lmidot": "ŀ",
-		"lmoustache": "⎰",
-		"lmoust": "⎰",
-		"lnap": "⪉",
-		"lnapprox": "⪉",
-		"lne": "⪇",
-		"lnE": "≨",
-		"lneq": "⪇",
-		"lneqq": "≨",
-		"lnsim": "⋦",
-		"loang": "⟬",
-		"loarr": "⇽",
-		"lobrk": "⟦",
-		"longleftarrow": "⟵",
-		"LongLeftArrow": "⟵",
-		"Longleftarrow": "⟸",
-		"longleftrightarrow": "⟷",
-		"LongLeftRightArrow": "⟷",
-		"Longleftrightarrow": "⟺",
-		"longmapsto": "⟼",
-		"longrightarrow": "⟶",
-		"LongRightArrow": "⟶",
-		"Longrightarrow": "⟹",
-		"looparrowleft": "↫",
-		"looparrowright": "↬",
-		"lopar": "⦅",
-		"Lopf": "𝕃",
-		"lopf": "𝕝",
-		"loplus": "⨭",
-		"lotimes": "⨴",
-		"lowast": "∗",
-		"lowbar": "_",
-		"LowerLeftArrow": "↙",
-		"LowerRightArrow": "↘",
-		"loz": "◊",
-		"lozenge": "◊",
-		"lozf": "⧫",
-		"lpar": "(",
-		"lparlt": "⦓",
-		"lrarr": "⇆",
-		"lrcorner": "⌟",
-		"lrhar": "⇋",
-		"lrhard": "⥭",
-		"lrm": "‎",
-		"lrtri": "⊿",
-		"lsaquo": "‹",
-		"lscr": "𝓁",
-		"Lscr": "ℒ",
-		"lsh": "↰",
-		"Lsh": "↰",
-		"lsim": "≲",
-		"lsime": "⪍",
-		"lsimg": "⪏",
-		"lsqb": "[",
-		"lsquo": "‘",
-		"lsquor": "‚",
-		"Lstrok": "Ł",
-		"lstrok": "ł",
-		"ltcc": "⪦",
-		"ltcir": "⩹",
-		"lt": "<",
-		"LT": "<",
-		"Lt": "≪",
-		"ltdot": "⋖",
-		"lthree": "⋋",
-		"ltimes": "⋉",
-		"ltlarr": "⥶",
-		"ltquest": "⩻",
-		"ltri": "◃",
-		"ltrie": "⊴",
-		"ltrif": "◂",
-		"ltrPar": "⦖",
-		"lurdshar": "⥊",
-		"luruhar": "⥦",
-		"lvertneqq": "≨︀",
-		"lvnE": "≨︀",
-		"macr": "¯",
-		"male": "♂",
-		"malt": "✠",
-		"maltese": "✠",
-		"Map": "⤅",
-		"map": "↦",
-		"mapsto": "↦",
-		"mapstodown": "↧",
-		"mapstoleft": "↤",
-		"mapstoup": "↥",
-		"marker": "▮",
-		"mcomma": "⨩",
-		"Mcy": "М",
-		"mcy": "м",
-		"mdash": "—",
-		"mDDot": "∺",
-		"measuredangle": "∡",
-		"MediumSpace": " ",
-		"Mellintrf": "ℳ",
-		"Mfr": "𝔐",
-		"mfr": "𝔪",
-		"mho": "℧",
-		"micro": "µ",
-		"midast": "*",
-		"midcir": "⫰",
-		"mid": "∣",
-		"middot": "·",
-		"minusb": "⊟",
-		"minus": "−",
-		"minusd": "∸",
-		"minusdu": "⨪",
-		"MinusPlus": "∓",
-		"mlcp": "⫛",
-		"mldr": "…",
-		"mnplus": "∓",
-		"models": "⊧",
-		"Mopf": "𝕄",
-		"mopf": "𝕞",
-		"mp": "∓",
-		"mscr": "𝓂",
-		"Mscr": "ℳ",
-		"mstpos": "∾",
-		"Mu": "Μ",
-		"mu": "μ",
-		"multimap": "⊸",
-		"mumap": "⊸",
-		"nabla": "∇",
-		"Nacute": "Ń",
-		"nacute": "ń",
-		"nang": "∠⃒",
-		"nap": "≉",
-		"napE": "⩰̸",
-		"napid": "≋̸",
-		"napos": "ʼn",
-		"napprox": "≉",
-		"natural": "♮",
-		"naturals": "ℕ",
-		"natur": "♮",
-		"nbsp": " ",
-		"nbump": "≎̸",
-		"nbumpe": "≏̸",
-		"ncap": "⩃",
-		"Ncaron": "Ň",
-		"ncaron": "ň",
-		"Ncedil": "Ņ",
-		"ncedil": "ņ",
-		"ncong": "≇",
-		"ncongdot": "⩭̸",
-		"ncup": "⩂",
-		"Ncy": "Н",
-		"ncy": "н",
-		"ndash": "–",
-		"nearhk": "⤤",
-		"nearr": "↗",
-		"neArr": "⇗",
-		"nearrow": "↗",
-		"ne": "≠",
-		"nedot": "≐̸",
-		"NegativeMediumSpace": "​",
-		"NegativeThickSpace": "​",
-		"NegativeThinSpace": "​",
-		"NegativeVeryThinSpace": "​",
-		"nequiv": "≢",
-		"nesear": "⤨",
-		"nesim": "≂̸",
-		"NestedGreaterGreater": "≫",
-		"NestedLessLess": "≪",
-		"NewLine": "\n",
-		"nexist": "∄",
-		"nexists": "∄",
-		"Nfr": "𝔑",
-		"nfr": "𝔫",
-		"ngE": "≧̸",
-		"nge": "≱",
-		"ngeq": "≱",
-		"ngeqq": "≧̸",
-		"ngeqslant": "⩾̸",
-		"nges": "⩾̸",
-		"nGg": "⋙̸",
-		"ngsim": "≵",
-		"nGt": "≫⃒",
-		"ngt": "≯",
-		"ngtr": "≯",
-		"nGtv": "≫̸",
-		"nharr": "↮",
-		"nhArr": "⇎",
-		"nhpar": "⫲",
-		"ni": "∋",
-		"nis": "⋼",
-		"nisd": "⋺",
-		"niv": "∋",
-		"NJcy": "Њ",
-		"njcy": "њ",
-		"nlarr": "↚",
-		"nlArr": "⇍",
-		"nldr": "‥",
-		"nlE": "≦̸",
-		"nle": "≰",
-		"nleftarrow": "↚",
-		"nLeftarrow": "⇍",
-		"nleftrightarrow": "↮",
-		"nLeftrightarrow": "⇎",
-		"nleq": "≰",
-		"nleqq": "≦̸",
-		"nleqslant": "⩽̸",
-		"nles": "⩽̸",
-		"nless": "≮",
-		"nLl": "⋘̸",
-		"nlsim": "≴",
-		"nLt": "≪⃒",
-		"nlt": "≮",
-		"nltri": "⋪",
-		"nltrie": "⋬",
-		"nLtv": "≪̸",
-		"nmid": "∤",
-		"NoBreak": "⁠",
-		"NonBreakingSpace": " ",
-		"nopf": "𝕟",
-		"Nopf": "ℕ",
-		"Not": "⫬",
-		"not": "¬",
-		"NotCongruent": "≢",
-		"NotCupCap": "≭",
-		"NotDoubleVerticalBar": "∦",
-		"NotElement": "∉",
-		"NotEqual": "≠",
-		"NotEqualTilde": "≂̸",
-		"NotExists": "∄",
-		"NotGreater": "≯",
-		"NotGreaterEqual": "≱",
-		"NotGreaterFullEqual": "≧̸",
-		"NotGreaterGreater": "≫̸",
-		"NotGreaterLess": "≹",
-		"NotGreaterSlantEqual": "⩾̸",
-		"NotGreaterTilde": "≵",
-		"NotHumpDownHump": "≎̸",
-		"NotHumpEqual": "≏̸",
-		"notin": "∉",
-		"notindot": "⋵̸",
-		"notinE": "⋹̸",
-		"notinva": "∉",
-		"notinvb": "⋷",
-		"notinvc": "⋶",
-		"NotLeftTriangleBar": "⧏̸",
-		"NotLeftTriangle": "⋪",
-		"NotLeftTriangleEqual": "⋬",
-		"NotLess": "≮",
-		"NotLessEqual": "≰",
-		"NotLessGreater": "≸",
-		"NotLessLess": "≪̸",
-		"NotLessSlantEqual": "⩽̸",
-		"NotLessTilde": "≴",
-		"NotNestedGreaterGreater": "⪢̸",
-		"NotNestedLessLess": "⪡̸",
-		"notni": "∌",
-		"notniva": "∌",
-		"notnivb": "⋾",
-		"notnivc": "⋽",
-		"NotPrecedes": "⊀",
-		"NotPrecedesEqual": "⪯̸",
-		"NotPrecedesSlantEqual": "⋠",
-		"NotReverseElement": "∌",
-		"NotRightTriangleBar": "⧐̸",
-		"NotRightTriangle": "⋫",
-		"NotRightTriangleEqual": "⋭",
-		"NotSquareSubset": "⊏̸",
-		"NotSquareSubsetEqual": "⋢",
-		"NotSquareSuperset": "⊐̸",
-		"NotSquareSupersetEqual": "⋣",
-		"NotSubset": "⊂⃒",
-		"NotSubsetEqual": "⊈",
-		"NotSucceeds": "⊁",
-		"NotSucceedsEqual": "⪰̸",
-		"NotSucceedsSlantEqual": "⋡",
-		"NotSucceedsTilde": "≿̸",
-		"NotSuperset": "⊃⃒",
-		"NotSupersetEqual": "⊉",
-		"NotTilde": "≁",
-		"NotTildeEqual": "≄",
-		"NotTildeFullEqual": "≇",
-		"NotTildeTilde": "≉",
-		"NotVerticalBar": "∤",
-		"nparallel": "∦",
-		"npar": "∦",
-		"nparsl": "⫽⃥",
-		"npart": "∂̸",
-		"npolint": "⨔",
-		"npr": "⊀",
-		"nprcue": "⋠",
-		"nprec": "⊀",
-		"npreceq": "⪯̸",
-		"npre": "⪯̸",
-		"nrarrc": "⤳̸",
-		"nrarr": "↛",
-		"nrArr": "⇏",
-		"nrarrw": "↝̸",
-		"nrightarrow": "↛",
-		"nRightarrow": "⇏",
-		"nrtri": "⋫",
-		"nrtrie": "⋭",
-		"nsc": "⊁",
-		"nsccue": "⋡",
-		"nsce": "⪰̸",
-		"Nscr": "𝒩",
-		"nscr": "𝓃",
-		"nshortmid": "∤",
-		"nshortparallel": "∦",
-		"nsim": "≁",
-		"nsime": "≄",
-		"nsimeq": "≄",
-		"nsmid": "∤",
-		"nspar": "∦",
-		"nsqsube": "⋢",
-		"nsqsupe": "⋣",
-		"nsub": "⊄",
-		"nsubE": "⫅̸",
-		"nsube": "⊈",
-		"nsubset": "⊂⃒",
-		"nsubseteq": "⊈",
-		"nsubseteqq": "⫅̸",
-		"nsucc": "⊁",
-		"nsucceq": "⪰̸",
-		"nsup": "⊅",
-		"nsupE": "⫆̸",
-		"nsupe": "⊉",
-		"nsupset": "⊃⃒",
-		"nsupseteq": "⊉",
-		"nsupseteqq": "⫆̸",
-		"ntgl": "≹",
-		"Ntilde": "Ñ",
-		"ntilde": "ñ",
-		"ntlg": "≸",
-		"ntriangleleft": "⋪",
-		"ntrianglelefteq": "⋬",
-		"ntriangleright": "⋫",
-		"ntrianglerighteq": "⋭",
-		"Nu": "Ν",
-		"nu": "ν",
-		"num": "#",
-		"numero": "№",
-		"numsp": " ",
-		"nvap": "≍⃒",
-		"nvdash": "⊬",
-		"nvDash": "⊭",
-		"nVdash": "⊮",
-		"nVDash": "⊯",
-		"nvge": "≥⃒",
-		"nvgt": ">⃒",
-		"nvHarr": "⤄",
-		"nvinfin": "⧞",
-		"nvlArr": "⤂",
-		"nvle": "≤⃒",
-		"nvlt": "<⃒",
-		"nvltrie": "⊴⃒",
-		"nvrArr": "⤃",
-		"nvrtrie": "⊵⃒",
-		"nvsim": "∼⃒",
-		"nwarhk": "⤣",
-		"nwarr": "↖",
-		"nwArr": "⇖",
-		"nwarrow": "↖",
-		"nwnear": "⤧",
-		"Oacute": "Ó",
-		"oacute": "ó",
-		"oast": "⊛",
-		"Ocirc": "Ô",
-		"ocirc": "ô",
-		"ocir": "⊚",
-		"Ocy": "О",
-		"ocy": "о",
-		"odash": "⊝",
-		"Odblac": "Ő",
-		"odblac": "ő",
-		"odiv": "⨸",
-		"odot": "⊙",
-		"odsold": "⦼",
-		"OElig": "Œ",
-		"oelig": "œ",
-		"ofcir": "⦿",
-		"Ofr": "𝔒",
-		"ofr": "𝔬",
-		"ogon": "˛",
-		"Ograve": "Ò",
-		"ograve": "ò",
-		"ogt": "⧁",
-		"ohbar": "⦵",
-		"ohm": "Ω",
-		"oint": "∮",
-		"olarr": "↺",
-		"olcir": "⦾",
-		"olcross": "⦻",
-		"oline": "‾",
-		"olt": "⧀",
-		"Omacr": "Ō",
-		"omacr": "ō",
-		"Omega": "Ω",
-		"omega": "ω",
-		"Omicron": "Ο",
-		"omicron": "ο",
-		"omid": "⦶",
-		"ominus": "⊖",
-		"Oopf": "𝕆",
-		"oopf": "𝕠",
-		"opar": "⦷",
-		"OpenCurlyDoubleQuote": "“",
-		"OpenCurlyQuote": "‘",
-		"operp": "⦹",
-		"oplus": "⊕",
-		"orarr": "↻",
-		"Or": "⩔",
-		"or": "∨",
-		"ord": "⩝",
-		"order": "ℴ",
-		"orderof": "ℴ",
-		"ordf": "ª",
-		"ordm": "º",
-		"origof": "⊶",
-		"oror": "⩖",
-		"orslope": "⩗",
-		"orv": "⩛",
-		"oS": "Ⓢ",
-		"Oscr": "𝒪",
-		"oscr": "ℴ",
-		"Oslash": "Ø",
-		"oslash": "ø",
-		"osol": "⊘",
-		"Otilde": "Õ",
-		"otilde": "õ",
-		"otimesas": "⨶",
-		"Otimes": "⨷",
-		"otimes": "⊗",
-		"Ouml": "Ö",
-		"ouml": "ö",
-		"ovbar": "⌽",
-		"OverBar": "‾",
-		"OverBrace": "⏞",
-		"OverBracket": "⎴",
-		"OverParenthesis": "⏜",
-		"para": "¶",
-		"parallel": "∥",
-		"par": "∥",
-		"parsim": "⫳",
-		"parsl": "⫽",
-		"part": "∂",
-		"PartialD": "∂",
-		"Pcy": "П",
-		"pcy": "п",
-		"percnt": "%",
-		"period": ".",
-		"permil": "‰",
-		"perp": "⊥",
-		"pertenk": "‱",
-		"Pfr": "𝔓",
-		"pfr": "𝔭",
-		"Phi": "Φ",
-		"phi": "φ",
-		"phiv": "ϕ",
-		"phmmat": "ℳ",
-		"phone": "☎",
-		"Pi": "Π",
-		"pi": "π",
-		"pitchfork": "⋔",
-		"piv": "ϖ",
-		"planck": "ℏ",
-		"planckh": "ℎ",
-		"plankv": "ℏ",
-		"plusacir": "⨣",
-		"plusb": "⊞",
-		"pluscir": "⨢",
-		"plus": "+",
-		"plusdo": "∔",
-		"plusdu": "⨥",
-		"pluse": "⩲",
-		"PlusMinus": "±",
-		"plusmn": "±",
-		"plussim": "⨦",
-		"plustwo": "⨧",
-		"pm": "±",
-		"Poincareplane": "ℌ",
-		"pointint": "⨕",
-		"popf": "𝕡",
-		"Popf": "ℙ",
-		"pound": "£",
-		"prap": "⪷",
-		"Pr": "⪻",
-		"pr": "≺",
-		"prcue": "≼",
-		"precapprox": "⪷",
-		"prec": "≺",
-		"preccurlyeq": "≼",
-		"Precedes": "≺",
-		"PrecedesEqual": "⪯",
-		"PrecedesSlantEqual": "≼",
-		"PrecedesTilde": "≾",
-		"preceq": "⪯",
-		"precnapprox": "⪹",
-		"precneqq": "⪵",
-		"precnsim": "⋨",
-		"pre": "⪯",
-		"prE": "⪳",
-		"precsim": "≾",
-		"prime": "′",
-		"Prime": "″",
-		"primes": "ℙ",
-		"prnap": "⪹",
-		"prnE": "⪵",
-		"prnsim": "⋨",
-		"prod": "∏",
-		"Product": "∏",
-		"profalar": "⌮",
-		"profline": "⌒",
-		"profsurf": "⌓",
-		"prop": "∝",
-		"Proportional": "∝",
-		"Proportion": "∷",
-		"propto": "∝",
-		"prsim": "≾",
-		"prurel": "⊰",
-		"Pscr": "𝒫",
-		"pscr": "𝓅",
-		"Psi": "Ψ",
-		"psi": "ψ",
-		"puncsp": " ",
-		"Qfr": "𝔔",
-		"qfr": "𝔮",
-		"qint": "⨌",
-		"qopf": "𝕢",
-		"Qopf": "ℚ",
-		"qprime": "⁗",
-		"Qscr": "𝒬",
-		"qscr": "𝓆",
-		"quaternions": "ℍ",
-		"quatint": "⨖",
-		"quest": "?",
-		"questeq": "≟",
-		"quot": "\"",
-		"QUOT": "\"",
-		"rAarr": "⇛",
-		"race": "∽̱",
-		"Racute": "Ŕ",
-		"racute": "ŕ",
-		"radic": "√",
-		"raemptyv": "⦳",
-		"rang": "⟩",
-		"Rang": "⟫",
-		"rangd": "⦒",
-		"range": "⦥",
-		"rangle": "⟩",
-		"raquo": "»",
-		"rarrap": "⥵",
-		"rarrb": "⇥",
-		"rarrbfs": "⤠",
-		"rarrc": "⤳",
-		"rarr": "→",
-		"Rarr": "↠",
-		"rArr": "⇒",
-		"rarrfs": "⤞",
-		"rarrhk": "↪",
-		"rarrlp": "↬",
-		"rarrpl": "⥅",
-		"rarrsim": "⥴",
-		"Rarrtl": "⤖",
-		"rarrtl": "↣",
-		"rarrw": "↝",
-		"ratail": "⤚",
-		"rAtail": "⤜",
-		"ratio": "∶",
-		"rationals": "ℚ",
-		"rbarr": "⤍",
-		"rBarr": "⤏",
-		"RBarr": "⤐",
-		"rbbrk": "❳",
-		"rbrace": "}",
-		"rbrack": "]",
-		"rbrke": "⦌",
-		"rbrksld": "⦎",
-		"rbrkslu": "⦐",
-		"Rcaron": "Ř",
-		"rcaron": "ř",
-		"Rcedil": "Ŗ",
-		"rcedil": "ŗ",
-		"rceil": "⌉",
-		"rcub": "}",
-		"Rcy": "Р",
-		"rcy": "р",
-		"rdca": "⤷",
-		"rdldhar": "⥩",
-		"rdquo": "”",
-		"rdquor": "”",
-		"rdsh": "↳",
-		"real": "ℜ",
-		"realine": "ℛ",
-		"realpart": "ℜ",
-		"reals": "ℝ",
-		"Re": "ℜ",
-		"rect": "▭",
-		"reg": "®",
-		"REG": "®",
-		"ReverseElement": "∋",
-		"ReverseEquilibrium": "⇋",
-		"ReverseUpEquilibrium": "⥯",
-		"rfisht": "⥽",
-		"rfloor": "⌋",
-		"rfr": "𝔯",
-		"Rfr": "ℜ",
-		"rHar": "⥤",
-		"rhard": "⇁",
-		"rharu": "⇀",
-		"rharul": "⥬",
-		"Rho": "Ρ",
-		"rho": "ρ",
-		"rhov": "ϱ",
-		"RightAngleBracket": "⟩",
-		"RightArrowBar": "⇥",
-		"rightarrow": "→",
-		"RightArrow": "→",
-		"Rightarrow": "⇒",
-		"RightArrowLeftArrow": "⇄",
-		"rightarrowtail": "↣",
-		"RightCeiling": "⌉",
-		"RightDoubleBracket": "⟧",
-		"RightDownTeeVector": "⥝",
-		"RightDownVectorBar": "⥕",
-		"RightDownVector": "⇂",
-		"RightFloor": "⌋",
-		"rightharpoondown": "⇁",
-		"rightharpoonup": "⇀",
-		"rightleftarrows": "⇄",
-		"rightleftharpoons": "⇌",
-		"rightrightarrows": "⇉",
-		"rightsquigarrow": "↝",
-		"RightTeeArrow": "↦",
-		"RightTee": "⊢",
-		"RightTeeVector": "⥛",
-		"rightthreetimes": "⋌",
-		"RightTriangleBar": "⧐",
-		"RightTriangle": "⊳",
-		"RightTriangleEqual": "⊵",
-		"RightUpDownVector": "⥏",
-		"RightUpTeeVector": "⥜",
-		"RightUpVectorBar": "⥔",
-		"RightUpVector": "↾",
-		"RightVectorBar": "⥓",
-		"RightVector": "⇀",
-		"ring": "˚",
-		"risingdotseq": "≓",
-		"rlarr": "⇄",
-		"rlhar": "⇌",
-		"rlm": "‏",
-		"rmoustache": "⎱",
-		"rmoust": "⎱",
-		"rnmid": "⫮",
-		"roang": "⟭",
-		"roarr": "⇾",
-		"robrk": "⟧",
-		"ropar": "⦆",
-		"ropf": "𝕣",
-		"Ropf": "ℝ",
-		"roplus": "⨮",
-		"rotimes": "⨵",
-		"RoundImplies": "⥰",
-		"rpar": ")",
-		"rpargt": "⦔",
-		"rppolint": "⨒",
-		"rrarr": "⇉",
-		"Rrightarrow": "⇛",
-		"rsaquo": "›",
-		"rscr": "𝓇",
-		"Rscr": "ℛ",
-		"rsh": "↱",
-		"Rsh": "↱",
-		"rsqb": "]",
-		"rsquo": "’",
-		"rsquor": "’",
-		"rthree": "⋌",
-		"rtimes": "⋊",
-		"rtri": "▹",
-		"rtrie": "⊵",
-		"rtrif": "▸",
-		"rtriltri": "⧎",
-		"RuleDelayed": "⧴",
-		"ruluhar": "⥨",
-		"rx": "℞",
-		"Sacute": "Ś",
-		"sacute": "ś",
-		"sbquo": "‚",
-		"scap": "⪸",
-		"Scaron": "Š",
-		"scaron": "š",
-		"Sc": "⪼",
-		"sc": "≻",
-		"sccue": "≽",
-		"sce": "⪰",
-		"scE": "⪴",
-		"Scedil": "Ş",
-		"scedil": "ş",
-		"Scirc": "Ŝ",
-		"scirc": "ŝ",
-		"scnap": "⪺",
-		"scnE": "⪶",
-		"scnsim": "⋩",
-		"scpolint": "⨓",
-		"scsim": "≿",
-		"Scy": "С",
-		"scy": "с",
-		"sdotb": "⊡",
-		"sdot": "⋅",
-		"sdote": "⩦",
-		"searhk": "⤥",
-		"searr": "↘",
-		"seArr": "⇘",
-		"searrow": "↘",
-		"sect": "§",
-		"semi": ";",
-		"seswar": "⤩",
-		"setminus": "∖",
-		"setmn": "∖",
-		"sext": "✶",
-		"Sfr": "𝔖",
-		"sfr": "𝔰",
-		"sfrown": "⌢",
-		"sharp": "♯",
-		"SHCHcy": "Щ",
-		"shchcy": "щ",
-		"SHcy": "Ш",
-		"shcy": "ш",
-		"ShortDownArrow": "↓",
-		"ShortLeftArrow": "←",
-		"shortmid": "∣",
-		"shortparallel": "∥",
-		"ShortRightArrow": "→",
-		"ShortUpArrow": "↑",
-		"shy": "­",
-		"Sigma": "Σ",
-		"sigma": "σ",
-		"sigmaf": "ς",
-		"sigmav": "ς",
-		"sim": "∼",
-		"simdot": "⩪",
-		"sime": "≃",
-		"simeq": "≃",
-		"simg": "⪞",
-		"simgE": "⪠",
-		"siml": "⪝",
-		"simlE": "⪟",
-		"simne": "≆",
-		"simplus": "⨤",
-		"simrarr": "⥲",
-		"slarr": "←",
-		"SmallCircle": "∘",
-		"smallsetminus": "∖",
-		"smashp": "⨳",
-		"smeparsl": "⧤",
-		"smid": "∣",
-		"smile": "⌣",
-		"smt": "⪪",
-		"smte": "⪬",
-		"smtes": "⪬︀",
-		"SOFTcy": "Ь",
-		"softcy": "ь",
-		"solbar": "⌿",
-		"solb": "⧄",
-		"sol": "/",
-		"Sopf": "𝕊",
-		"sopf": "𝕤",
-		"spades": "♠",
-		"spadesuit": "♠",
-		"spar": "∥",
-		"sqcap": "⊓",
-		"sqcaps": "⊓︀",
-		"sqcup": "⊔",
-		"sqcups": "⊔︀",
-		"Sqrt": "√",
-		"sqsub": "⊏",
-		"sqsube": "⊑",
-		"sqsubset": "⊏",
-		"sqsubseteq": "⊑",
-		"sqsup": "⊐",
-		"sqsupe": "⊒",
-		"sqsupset": "⊐",
-		"sqsupseteq": "⊒",
-		"square": "□",
-		"Square": "□",
-		"SquareIntersection": "⊓",
-		"SquareSubset": "⊏",
-		"SquareSubsetEqual": "⊑",
-		"SquareSuperset": "⊐",
-		"SquareSupersetEqual": "⊒",
-		"SquareUnion": "⊔",
-		"squarf": "▪",
-		"squ": "□",
-		"squf": "▪",
-		"srarr": "→",
-		"Sscr": "𝒮",
-		"sscr": "𝓈",
-		"ssetmn": "∖",
-		"ssmile": "⌣",
-		"sstarf": "⋆",
-		"Star": "⋆",
-		"star": "☆",
-		"starf": "★",
-		"straightepsilon": "ϵ",
-		"straightphi": "ϕ",
-		"strns": "¯",
-		"sub": "⊂",
-		"Sub": "⋐",
-		"subdot": "⪽",
-		"subE": "⫅",
-		"sube": "⊆",
-		"subedot": "⫃",
-		"submult": "⫁",
-		"subnE": "⫋",
-		"subne": "⊊",
-		"subplus": "⪿",
-		"subrarr": "⥹",
-		"subset": "⊂",
-		"Subset": "⋐",
-		"subseteq": "⊆",
-		"subseteqq": "⫅",
-		"SubsetEqual": "⊆",
-		"subsetneq": "⊊",
-		"subsetneqq": "⫋",
-		"subsim": "⫇",
-		"subsub": "⫕",
-		"subsup": "⫓",
-		"succapprox": "⪸",
-		"succ": "≻",
-		"succcurlyeq": "≽",
-		"Succeeds": "≻",
-		"SucceedsEqual": "⪰",
-		"SucceedsSlantEqual": "≽",
-		"SucceedsTilde": "≿",
-		"succeq": "⪰",
-		"succnapprox": "⪺",
-		"succneqq": "⪶",
-		"succnsim": "⋩",
-		"succsim": "≿",
-		"SuchThat": "∋",
-		"sum": "∑",
-		"Sum": "∑",
-		"sung": "♪",
-		"sup1": "¹",
-		"sup2": "²",
-		"sup3": "³",
-		"sup": "⊃",
-		"Sup": "⋑",
-		"supdot": "⪾",
-		"supdsub": "⫘",
-		"supE": "⫆",
-		"supe": "⊇",
-		"supedot": "⫄",
-		"Superset": "⊃",
-		"SupersetEqual": "⊇",
-		"suphsol": "⟉",
-		"suphsub": "⫗",
-		"suplarr": "⥻",
-		"supmult": "⫂",
-		"supnE": "⫌",
-		"supne": "⊋",
-		"supplus": "⫀",
-		"supset": "⊃",
-		"Supset": "⋑",
-		"supseteq": "⊇",
-		"supseteqq": "⫆",
-		"supsetneq": "⊋",
-		"supsetneqq": "⫌",
-		"supsim": "⫈",
-		"supsub": "⫔",
-		"supsup": "⫖",
-		"swarhk": "⤦",
-		"swarr": "↙",
-		"swArr": "⇙",
-		"swarrow": "↙",
-		"swnwar": "⤪",
-		"szlig": "ß",
-		"Tab": "\t",
-		"target": "⌖",
-		"Tau": "Τ",
-		"tau": "τ",
-		"tbrk": "⎴",
-		"Tcaron": "Ť",
-		"tcaron": "ť",
-		"Tcedil": "Ţ",
-		"tcedil": "ţ",
-		"Tcy": "Т",
-		"tcy": "т",
-		"tdot": "⃛",
-		"telrec": "⌕",
-		"Tfr": "𝔗",
-		"tfr": "𝔱",
-		"there4": "∴",
-		"therefore": "∴",
-		"Therefore": "∴",
-		"Theta": "Θ",
-		"theta": "θ",
-		"thetasym": "ϑ",
-		"thetav": "ϑ",
-		"thickapprox": "≈",
-		"thicksim": "∼",
-		"ThickSpace": "  ",
-		"ThinSpace": " ",
-		"thinsp": " ",
-		"thkap": "≈",
-		"thksim": "∼",
-		"THORN": "Þ",
-		"thorn": "þ",
-		"tilde": "˜",
-		"Tilde": "∼",
-		"TildeEqual": "≃",
-		"TildeFullEqual": "≅",
-		"TildeTilde": "≈",
-		"timesbar": "⨱",
-		"timesb": "⊠",
-		"times": "×",
-		"timesd": "⨰",
-		"tint": "∭",
-		"toea": "⤨",
-		"topbot": "⌶",
-		"topcir": "⫱",
-		"top": "⊤",
-		"Topf": "𝕋",
-		"topf": "𝕥",
-		"topfork": "⫚",
-		"tosa": "⤩",
-		"tprime": "‴",
-		"trade": "™",
-		"TRADE": "™",
-		"triangle": "▵",
-		"triangledown": "▿",
-		"triangleleft": "◃",
-		"trianglelefteq": "⊴",
-		"triangleq": "≜",
-		"triangleright": "▹",
-		"trianglerighteq": "⊵",
-		"tridot": "◬",
-		"trie": "≜",
-		"triminus": "⨺",
-		"TripleDot": "⃛",
-		"triplus": "⨹",
-		"trisb": "⧍",
-		"tritime": "⨻",
-		"trpezium": "⏢",
-		"Tscr": "𝒯",
-		"tscr": "𝓉",
-		"TScy": "Ц",
-		"tscy": "ц",
-		"TSHcy": "Ћ",
-		"tshcy": "ћ",
-		"Tstrok": "Ŧ",
-		"tstrok": "ŧ",
-		"twixt": "≬",
-		"twoheadleftarrow": "↞",
-		"twoheadrightarrow": "↠",
-		"Uacute": "Ú",
-		"uacute": "ú",
-		"uarr": "↑",
-		"Uarr": "↟",
-		"uArr": "⇑",
-		"Uarrocir": "⥉",
-		"Ubrcy": "Ў",
-		"ubrcy": "ў",
-		"Ubreve": "Ŭ",
-		"ubreve": "ŭ",
-		"Ucirc": "Û",
-		"ucirc": "û",
-		"Ucy": "У",
-		"ucy": "у",
-		"udarr": "⇅",
-		"Udblac": "Ű",
-		"udblac": "ű",
-		"udhar": "⥮",
-		"ufisht": "⥾",
-		"Ufr": "𝔘",
-		"ufr": "𝔲",
-		"Ugrave": "Ù",
-		"ugrave": "ù",
-		"uHar": "⥣",
-		"uharl": "↿",
-		"uharr": "↾",
-		"uhblk": "▀",
-		"ulcorn": "⌜",
-		"ulcorner": "⌜",
-		"ulcrop": "⌏",
-		"ultri": "◸",
-		"Umacr": "Ū",
-		"umacr": "ū",
-		"uml": "¨",
-		"UnderBar": "_",
-		"UnderBrace": "⏟",
-		"UnderBracket": "⎵",
-		"UnderParenthesis": "⏝",
-		"Union": "⋃",
-		"UnionPlus": "⊎",
-		"Uogon": "Ų",
-		"uogon": "ų",
-		"Uopf": "𝕌",
-		"uopf": "𝕦",
-		"UpArrowBar": "⤒",
-		"uparrow": "↑",
-		"UpArrow": "↑",
-		"Uparrow": "⇑",
-		"UpArrowDownArrow": "⇅",
-		"updownarrow": "↕",
-		"UpDownArrow": "↕",
-		"Updownarrow": "⇕",
-		"UpEquilibrium": "⥮",
-		"upharpoonleft": "↿",
-		"upharpoonright": "↾",
-		"uplus": "⊎",
-		"UpperLeftArrow": "↖",
-		"UpperRightArrow": "↗",
-		"upsi": "υ",
-		"Upsi": "ϒ",
-		"upsih": "ϒ",
-		"Upsilon": "Υ",
-		"upsilon": "υ",
-		"UpTeeArrow": "↥",
-		"UpTee": "⊥",
-		"upuparrows": "⇈",
-		"urcorn": "⌝",
-		"urcorner": "⌝",
-		"urcrop": "⌎",
-		"Uring": "Ů",
-		"uring": "ů",
-		"urtri": "◹",
-		"Uscr": "𝒰",
-		"uscr": "𝓊",
-		"utdot": "⋰",
-		"Utilde": "Ũ",
-		"utilde": "ũ",
-		"utri": "▵",
-		"utrif": "▴",
-		"uuarr": "⇈",
-		"Uuml": "Ü",
-		"uuml": "ü",
-		"uwangle": "⦧",
-		"vangrt": "⦜",
-		"varepsilon": "ϵ",
-		"varkappa": "ϰ",
-		"varnothing": "∅",
-		"varphi": "ϕ",
-		"varpi": "ϖ",
-		"varpropto": "∝",
-		"varr": "↕",
-		"vArr": "⇕",
-		"varrho": "ϱ",
-		"varsigma": "ς",
-		"varsubsetneq": "⊊︀",
-		"varsubsetneqq": "⫋︀",
-		"varsupsetneq": "⊋︀",
-		"varsupsetneqq": "⫌︀",
-		"vartheta": "ϑ",
-		"vartriangleleft": "⊲",
-		"vartriangleright": "⊳",
-		"vBar": "⫨",
-		"Vbar": "⫫",
-		"vBarv": "⫩",
-		"Vcy": "В",
-		"vcy": "в",
-		"vdash": "⊢",
-		"vDash": "⊨",
-		"Vdash": "⊩",
-		"VDash": "⊫",
-		"Vdashl": "⫦",
-		"veebar": "⊻",
-		"vee": "∨",
-		"Vee": "⋁",
-		"veeeq": "≚",
-		"vellip": "⋮",
-		"verbar": "|",
-		"Verbar": "‖",
-		"vert": "|",
-		"Vert": "‖",
-		"VerticalBar": "∣",
-		"VerticalLine": "|",
-		"VerticalSeparator": "❘",
-		"VerticalTilde": "≀",
-		"VeryThinSpace": " ",
-		"Vfr": "𝔙",
-		"vfr": "𝔳",
-		"vltri": "⊲",
-		"vnsub": "⊂⃒",
-		"vnsup": "⊃⃒",
-		"Vopf": "𝕍",
-		"vopf": "𝕧",
-		"vprop": "∝",
-		"vrtri": "⊳",
-		"Vscr": "𝒱",
-		"vscr": "𝓋",
-		"vsubnE": "⫋︀",
-		"vsubne": "⊊︀",
-		"vsupnE": "⫌︀",
-		"vsupne": "⊋︀",
-		"Vvdash": "⊪",
-		"vzigzag": "⦚",
-		"Wcirc": "Ŵ",
-		"wcirc": "ŵ",
-		"wedbar": "⩟",
-		"wedge": "∧",
-		"Wedge": "⋀",
-		"wedgeq": "≙",
-		"weierp": "℘",
-		"Wfr": "𝔚",
-		"wfr": "𝔴",
-		"Wopf": "𝕎",
-		"wopf": "𝕨",
-		"wp": "℘",
-		"wr": "≀",
-		"wreath": "≀",
-		"Wscr": "𝒲",
-		"wscr": "𝓌",
-		"xcap": "⋂",
-		"xcirc": "◯",
-		"xcup": "⋃",
-		"xdtri": "▽",
-		"Xfr": "𝔛",
-		"xfr": "𝔵",
-		"xharr": "⟷",
-		"xhArr": "⟺",
-		"Xi": "Ξ",
-		"xi": "ξ",
-		"xlarr": "⟵",
-		"xlArr": "⟸",
-		"xmap": "⟼",
-		"xnis": "⋻",
-		"xodot": "⨀",
-		"Xopf": "𝕏",
-		"xopf": "𝕩",
-		"xoplus": "⨁",
-		"xotime": "⨂",
-		"xrarr": "⟶",
-		"xrArr": "⟹",
-		"Xscr": "𝒳",
-		"xscr": "𝓍",
-		"xsqcup": "⨆",
-		"xuplus": "⨄",
-		"xutri": "△",
-		"xvee": "⋁",
-		"xwedge": "⋀",
-		"Yacute": "Ý",
-		"yacute": "ý",
-		"YAcy": "Я",
-		"yacy": "я",
-		"Ycirc": "Ŷ",
-		"ycirc": "ŷ",
-		"Ycy": "Ы",
-		"ycy": "ы",
-		"yen": "¥",
-		"Yfr": "𝔜",
-		"yfr": "𝔶",
-		"YIcy": "Ї",
-		"yicy": "ї",
-		"Yopf": "𝕐",
-		"yopf": "𝕪",
-		"Yscr": "𝒴",
-		"yscr": "𝓎",
-		"YUcy": "Ю",
-		"yucy": "ю",
-		"yuml": "ÿ",
-		"Yuml": "Ÿ",
-		"Zacute": "Ź",
-		"zacute": "ź",
-		"Zcaron": "Ž",
-		"zcaron": "ž",
-		"Zcy": "З",
-		"zcy": "з",
-		"Zdot": "Ż",
-		"zdot": "ż",
-		"zeetrf": "ℨ",
-		"ZeroWidthSpace": "​",
-		"Zeta": "Ζ",
-		"zeta": "ζ",
-		"zfr": "𝔷",
-		"Zfr": "ℨ",
-		"ZHcy": "Ж",
-		"zhcy": "ж",
-		"zigrarr": "⇝",
-		"zopf": "𝕫",
-		"Zopf": "ℤ",
-		"Zscr": "𝒵",
-		"zscr": "𝓏",
-		"zwj": "‍",
-		"zwnj": "‌"
-	};
-
-/***/ },
-/* 20 */
-/***/ function(module, exports) {
-
-	module.exports = {
-		"Aacute": "Á",
-		"aacute": "á",
-		"Acirc": "Â",
-		"acirc": "â",
-		"acute": "´",
-		"AElig": "Æ",
-		"aelig": "æ",
-		"Agrave": "À",
-		"agrave": "à",
-		"amp": "&",
-		"AMP": "&",
-		"Aring": "Å",
-		"aring": "å",
-		"Atilde": "Ã",
-		"atilde": "ã",
-		"Auml": "Ä",
-		"auml": "ä",
-		"brvbar": "¦",
-		"Ccedil": "Ç",
-		"ccedil": "ç",
-		"cedil": "¸",
-		"cent": "¢",
-		"copy": "©",
-		"COPY": "©",
-		"curren": "¤",
-		"deg": "°",
-		"divide": "÷",
-		"Eacute": "É",
-		"eacute": "é",
-		"Ecirc": "Ê",
-		"ecirc": "ê",
-		"Egrave": "È",
-		"egrave": "è",
-		"ETH": "Ð",
-		"eth": "ð",
-		"Euml": "Ë",
-		"euml": "ë",
-		"frac12": "½",
-		"frac14": "¼",
-		"frac34": "¾",
-		"gt": ">",
-		"GT": ">",
-		"Iacute": "Í",
-		"iacute": "í",
-		"Icirc": "Î",
-		"icirc": "î",
-		"iexcl": "¡",
-		"Igrave": "Ì",
-		"igrave": "ì",
-		"iquest": "¿",
-		"Iuml": "Ï",
-		"iuml": "ï",
-		"laquo": "«",
-		"lt": "<",
-		"LT": "<",
-		"macr": "¯",
-		"micro": "µ",
-		"middot": "·",
-		"nbsp": " ",
-		"not": "¬",
-		"Ntilde": "Ñ",
-		"ntilde": "ñ",
-		"Oacute": "Ó",
-		"oacute": "ó",
-		"Ocirc": "Ô",
-		"ocirc": "ô",
-		"Ograve": "Ò",
-		"ograve": "ò",
-		"ordf": "ª",
-		"ordm": "º",
-		"Oslash": "Ø",
-		"oslash": "ø",
-		"Otilde": "Õ",
-		"otilde": "õ",
-		"Ouml": "Ö",
-		"ouml": "ö",
-		"para": "¶",
-		"plusmn": "±",
-		"pound": "£",
-		"quot": "\"",
-		"QUOT": "\"",
-		"raquo": "»",
-		"reg": "®",
-		"REG": "®",
-		"sect": "§",
-		"shy": "­",
-		"sup1": "¹",
-		"sup2": "²",
-		"sup3": "³",
-		"szlig": "ß",
-		"THORN": "Þ",
-		"thorn": "þ",
-		"times": "×",
-		"Uacute": "Ú",
-		"uacute": "ú",
-		"Ucirc": "Û",
-		"ucirc": "û",
-		"Ugrave": "Ù",
-		"ugrave": "ù",
-		"uml": "¨",
-		"Uuml": "Ü",
-		"uuml": "ü",
-		"Yacute": "Ý",
-		"yacute": "ý",
-		"yen": "¥",
-		"yuml": "ÿ"
-	};
-
-/***/ },
-/* 21 */
-/***/ function(module, exports) {
-
-	module.exports = {
-		"amp": "&",
-		"apos": "'",
-		"gt": ">",
-		"lt": "<",
-		"quot": "\""
-	};
-
-/***/ },
-/* 22 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var ElementType = __webpack_require__(23);
-
-	var re_whitespace = /\s+/g;
-	var NodePrototype = __webpack_require__(24);
-	var ElementPrototype = __webpack_require__(25);
-
-	function DomHandler(callback, options, elementCB){
-		if(typeof callback === "object"){
-			elementCB = options;
-			options = callback;
-			callback = null;
-		} else if(typeof options === "function"){
-			elementCB = options;
-			options = defaultOpts;
-		}
-		this._callback = callback;
-		this._options = options || defaultOpts;
-		this._elementCB = elementCB;
-		this.dom = [];
-		this._done = false;
-		this._tagStack = [];
-		this._parser = this._parser || null;
-	}
-
-	//default options
-	var defaultOpts = {
-		normalizeWhitespace: false, //Replace all whitespace with single spaces
-		withStartIndices: false, //Add startIndex properties to nodes
-	};
-
-	DomHandler.prototype.onparserinit = function(parser){
-		this._parser = parser;
-	};
-
-	//Resets the handler back to starting state
-	DomHandler.prototype.onreset = function(){
-		DomHandler.call(this, this._callback, this._options, this._elementCB);
-	};
-
-	//Signals the handler that parsing is done
-	DomHandler.prototype.onend = function(){
-		if(this._done) return;
-		this._done = true;
-		this._parser = null;
-		this._handleCallback(null);
-	};
-
-	DomHandler.prototype._handleCallback =
-	DomHandler.prototype.onerror = function(error){
-		if(typeof this._callback === "function"){
-			this._callback(error, this.dom);
-		} else {
-			if(error) throw error;
-		}
-	};
-
-	DomHandler.prototype.onclosetag = function(){
-		//if(this._tagStack.pop().name !== name) this._handleCallback(Error("Tagname didn't match!"));
-		var elem = this._tagStack.pop();
-		if(this._elementCB) this._elementCB(elem);
-	};
-
-	DomHandler.prototype._addDomElement = function(element){
-		var parent = this._tagStack[this._tagStack.length - 1];
-		var siblings = parent ? parent.children : this.dom;
-		var previousSibling = siblings[siblings.length - 1];
-
-		element.next = null;
-
-		if(this._options.withStartIndices){
-			element.startIndex = this._parser.startIndex;
-		}
-
-		if (this._options.withDomLvl1) {
-			element.__proto__ = element.type === "tag" ? ElementPrototype : NodePrototype;
-		}
-
-		if(previousSibling){
-			element.prev = previousSibling;
-			previousSibling.next = element;
-		} else {
-			element.prev = null;
-		}
-
-		siblings.push(element);
-		element.parent = parent || null;
-	};
-
-	DomHandler.prototype.onopentag = function(name, attribs){
-		var element = {
-			type: name === "script" ? ElementType.Script : name === "style" ? ElementType.Style : ElementType.Tag,
-			name: name,
-			attribs: attribs,
-			children: []
-		};
-
-		this._addDomElement(element);
-
-		this._tagStack.push(element);
-	};
-
-	DomHandler.prototype.ontext = function(data){
-		//the ignoreWhitespace is officially dropped, but for now,
-		//it's an alias for normalizeWhitespace
-		var normalize = this._options.normalizeWhitespace || this._options.ignoreWhitespace;
-
-		var lastTag;
-
-		if(!this._tagStack.length && this.dom.length && (lastTag = this.dom[this.dom.length-1]).type === ElementType.Text){
-			if(normalize){
-				lastTag.data = (lastTag.data + data).replace(re_whitespace, " ");
-			} else {
-				lastTag.data += data;
-			}
-		} else {
-			if(
-				this._tagStack.length &&
-				(lastTag = this._tagStack[this._tagStack.length - 1]) &&
-				(lastTag = lastTag.children[lastTag.children.length - 1]) &&
-				lastTag.type === ElementType.Text
-			){
-				if(normalize){
-					lastTag.data = (lastTag.data + data).replace(re_whitespace, " ");
-				} else {
-					lastTag.data += data;
-				}
-			} else {
-				if(normalize){
-					data = data.replace(re_whitespace, " ");
-				}
-
-				this._addDomElement({
-					data: data,
-					type: ElementType.Text
-				});
-			}
-		}
-	};
-
-	DomHandler.prototype.oncomment = function(data){
-		var lastTag = this._tagStack[this._tagStack.length - 1];
-
-		if(lastTag && lastTag.type === ElementType.Comment){
-			lastTag.data += data;
-			return;
-		}
-
-		var element = {
-			data: data,
-			type: ElementType.Comment
-		};
-
-		this._addDomElement(element);
-		this._tagStack.push(element);
-	};
-
-	DomHandler.prototype.oncdatastart = function(){
-		var element = {
-			children: [{
-				data: "",
-				type: ElementType.Text
-			}],
-			type: ElementType.CDATA
-		};
-
-		this._addDomElement(element);
-		this._tagStack.push(element);
-	};
-
-	DomHandler.prototype.oncommentend = DomHandler.prototype.oncdataend = function(){
-		this._tagStack.pop();
-	};
-
-	DomHandler.prototype.onprocessinginstruction = function(name, data){
-		this._addDomElement({
-			name: name,
-			data: data,
-			type: ElementType.Directive
-		});
-	};
-
-	module.exports = DomHandler;
-
-
-/***/ },
-/* 23 */
-/***/ function(module, exports) {
-
-	//Types of elements found in the DOM
-	module.exports = {
-		Text: "text", //Text
-		Directive: "directive", //<? ... ?>
-		Comment: "comment", //<!-- ... -->
-		Script: "script", //<script> tags
-		Style: "style", //<style> tags
-		Tag: "tag", //Any tag
-		CDATA: "cdata", //<![CDATA[ ... ]]>
-		Doctype: "doctype",
-
-		isTag: function(elem){
-			return elem.type === "tag" || elem.type === "script" || elem.type === "style";
-		}
-	};
-
-
-/***/ },
-/* 24 */
-/***/ function(module, exports) {
-
-	// This object will be used as the prototype for Nodes when creating a
-	// DOM-Level-1-compliant structure.
-	var NodePrototype = module.exports = {
-		get firstChild() {
-			var children = this.children;
-			return children && children[0] || null;
-		},
-		get lastChild() {
-			var children = this.children;
-			return children && children[children.length - 1] || null;
-		},
-		get nodeType() {
-			return nodeTypes[this.type] || nodeTypes.element;
-		}
-	};
-
-	var domLvl1 = {
-		tagName: "name",
-		childNodes: "children",
-		parentNode: "parent",
-		previousSibling: "prev",
-		nextSibling: "next",
-		nodeValue: "data"
-	};
-
-	var nodeTypes = {
-		element: 1,
-		text: 3,
-		cdata: 4,
-		comment: 8
-	};
-
-	Object.keys(domLvl1).forEach(function(key) {
-		var shorthand = domLvl1[key];
-		Object.defineProperty(NodePrototype, key, {
-			get: function() {
-				return this[shorthand] || null;
-			},
-			set: function(val) {
-				this[shorthand] = val;
-				return val;
-			}
-		});
-	});
-
-
-/***/ },
-/* 25 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// DOM-Level-1-compliant structure
-	var NodePrototype = __webpack_require__(24);
-	var ElementPrototype = module.exports = Object.create(NodePrototype);
-
-	var domLvl1 = {
-		tagName: "name"
-	};
-
-	Object.keys(domLvl1).forEach(function(key) {
-		var shorthand = domLvl1[key];
-		Object.defineProperty(ElementPrototype, key, {
-			get: function() {
-				return this[shorthand] || null;
-			},
-			set: function(val) {
-				this[shorthand] = val;
-				return val;
-			}
-		});
-	});
-
-
-/***/ },
-/* 26 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var index = __webpack_require__(14),
-	    DomHandler = index.DomHandler,
-		DomUtils = index.DomUtils;
-
-	//TODO: make this a streamable handler
-	function FeedHandler(callback, options){
-		this.init(callback, options);
-	}
-
-	__webpack_require__(2).inherits(FeedHandler, DomHandler);
-
-	FeedHandler.prototype.init = DomHandler;
-
-	function getElements(what, where){
-		return DomUtils.getElementsByTagName(what, where, true);
-	}
-	function getOneElement(what, where){
-		return DomUtils.getElementsByTagName(what, where, true, 1)[0];
-	}
-	function fetch(what, where, recurse){
-		return DomUtils.getText(
-			DomUtils.getElementsByTagName(what, where, recurse, 1)
-		).trim();
-	}
-
-	function addConditionally(obj, prop, what, where, recurse){
-		var tmp = fetch(what, where, recurse);
-		if(tmp) obj[prop] = tmp;
-	}
-
-	var isValidFeed = function(value){
-		return value === "rss" || value === "feed" || value === "rdf:RDF";
-	};
-
-	FeedHandler.prototype.onend = function(){
-		var feed = {},
-			feedRoot = getOneElement(isValidFeed, this.dom),
-			tmp, childs;
-
-		if(feedRoot){
-			if(feedRoot.name === "feed"){
-				childs = feedRoot.children;
-
-				feed.type = "atom";
-				addConditionally(feed, "id", "id", childs);
-				addConditionally(feed, "title", "title", childs);
-				if((tmp = getOneElement("link", childs)) && (tmp = tmp.attribs) && (tmp = tmp.href)) feed.link = tmp;
-				addConditionally(feed, "description", "subtitle", childs);
-				if((tmp = fetch("updated", childs))) feed.updated = new Date(tmp);
-				addConditionally(feed, "author", "email", childs, true);
-
-				feed.items = getElements("entry", childs).map(function(item){
-					var entry = {}, tmp;
-
-					item = item.children;
-
-					addConditionally(entry, "id", "id", item);
-					addConditionally(entry, "title", "title", item);
-					if((tmp = getOneElement("link", item)) && (tmp = tmp.attribs) && (tmp = tmp.href)) entry.link = tmp;
-					if((tmp = fetch("summary", item) || fetch("content", item))) entry.description = tmp;
-					if((tmp = fetch("updated", item))) entry.pubDate = new Date(tmp);
-					return entry;
-				});
-			} else {
-				childs = getOneElement("channel", feedRoot.children).children;
-
-				feed.type = feedRoot.name.substr(0, 3);
-				feed.id = "";
-				addConditionally(feed, "title", "title", childs);
-				addConditionally(feed, "link", "link", childs);
-				addConditionally(feed, "description", "description", childs);
-				if((tmp = fetch("lastBuildDate", childs))) feed.updated = new Date(tmp);
-				addConditionally(feed, "author", "managingEditor", childs, true);
-
-				feed.items = getElements("item", feedRoot.children).map(function(item){
-					var entry = {}, tmp;
-
-					item = item.children;
-
-					addConditionally(entry, "id", "guid", item);
-					addConditionally(entry, "title", "title", item);
-					addConditionally(entry, "link", "link", item);
-					addConditionally(entry, "description", "description", item);
-					if((tmp = fetch("pubDate", item))) entry.pubDate = new Date(tmp);
-					return entry;
-				});
-			}
-		}
-		this.dom = feed;
-		DomHandler.prototype._handleCallback.call(
-			this, feedRoot ? null : Error("couldn't find root of feed")
-		);
-	};
-
-	module.exports = FeedHandler;
-
-
-/***/ },
-/* 27 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = Stream;
-
-	var Parser = __webpack_require__(28);
-
-	function Stream(options){
-		Parser.call(this, new Cbs(this), options);
-	}
-
-	__webpack_require__(2).inherits(Stream, Parser);
-
-	Stream.prototype.readable = true;
-
-	function Cbs(scope){
-		this.scope = scope;
-	}
-
-	var EVENTS = __webpack_require__(14).EVENTS;
-
-	Object.keys(EVENTS).forEach(function(name){
-		if(EVENTS[name] === 0){
-			Cbs.prototype["on" + name] = function(){
-				this.scope.emit(name);
-			};
-		} else if(EVENTS[name] === 1){
-			Cbs.prototype["on" + name] = function(a){
-				this.scope.emit(name, a);
-			};
-		} else if(EVENTS[name] === 2){
-			Cbs.prototype["on" + name] = function(a, b){
-				this.scope.emit(name, a, b);
-			};
-		} else {
-			throw Error("wrong number of arguments!");
-		}
-	});
-
-/***/ },
-/* 28 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = Stream;
-
-	var Parser = __webpack_require__(15),
-	    WritableStream = __webpack_require__(29).Writable || __webpack_require__(50).Writable;
-
-	function Stream(cbs, options){
-		var parser = this._parser = new Parser(cbs, options);
-
-		WritableStream.call(this, {decodeStrings: false});
-
-		this.once("finish", function(){
-			parser.end();
-		});
-	}
-
-	__webpack_require__(2).inherits(Stream, WritableStream);
-
-	WritableStream.prototype._write = function(chunk, encoding, cb){
-		this._parser.write(chunk);
-		cb();
-	};
-
-/***/ },
-/* 29 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	module.exports = Stream;
-
-	var EE = __webpack_require__(1).EventEmitter;
-	var inherits = __webpack_require__(30);
-
-	inherits(Stream, EE);
-	Stream.Readable = __webpack_require__(31);
-	Stream.Writable = __webpack_require__(46);
-	Stream.Duplex = __webpack_require__(47);
-	Stream.Transform = __webpack_require__(48);
-	Stream.PassThrough = __webpack_require__(49);
-
-	// Backwards-compat with node 0.4.x
-	Stream.Stream = Stream;
-
-
-
-	// old-style streams.  Note that the pipe method (the only relevant
-	// part of this class) is overridden in the Readable class.
-
-	function Stream() {
-	  EE.call(this);
-	}
-
-	Stream.prototype.pipe = function(dest, options) {
-	  var source = this;
-
-	  function ondata(chunk) {
-	    if (dest.writable) {
-	      if (false === dest.write(chunk) && source.pause) {
-	        source.pause();
-	      }
-	    }
-	  }
-
-	  source.on('data', ondata);
-
-	  function ondrain() {
-	    if (source.readable && source.resume) {
-	      source.resume();
-	    }
-	  }
-
-	  dest.on('drain', ondrain);
-
-	  // If the 'end' option is not supplied, dest.end() will be called when
-	  // source gets the 'end' or 'close' events.  Only dest.end() once.
-	  if (!dest._isStdio && (!options || options.end !== false)) {
-	    source.on('end', onend);
-	    source.on('close', onclose);
-	  }
-
-	  var didOnEnd = false;
-	  function onend() {
-	    if (didOnEnd) return;
-	    didOnEnd = true;
-
-	    dest.end();
-	  }
-
-
-	  function onclose() {
-	    if (didOnEnd) return;
-	    didOnEnd = true;
-
-	    if (typeof dest.destroy === 'function') dest.destroy();
-	  }
-
-	  // don't leave dangling pipes when there are errors.
-	  function onerror(er) {
-	    cleanup();
-	    if (EE.listenerCount(this, 'error') === 0) {
-	      throw er; // Unhandled stream error in pipe.
-	    }
-	  }
-
-	  source.on('error', onerror);
-	  dest.on('error', onerror);
-
-	  // remove all the event listeners that were added.
-	  function cleanup() {
-	    source.removeListener('data', ondata);
-	    dest.removeListener('drain', ondrain);
-
-	    source.removeListener('end', onend);
-	    source.removeListener('close', onclose);
-
-	    source.removeListener('error', onerror);
-	    dest.removeListener('error', onerror);
-
-	    source.removeListener('end', cleanup);
-	    source.removeListener('close', cleanup);
-
-	    dest.removeListener('close', cleanup);
-	  }
-
-	  source.on('end', cleanup);
-	  source.on('close', cleanup);
-
-	  dest.on('close', cleanup);
-
-	  dest.emit('pipe', source);
-
-	  // Allow for unix-like usage: A.pipe(B).pipe(C)
-	  return dest;
-	};
-
-
-/***/ },
-/* 30 */
-/***/ function(module, exports) {
-
-	if (typeof Object.create === 'function') {
-	  // implementation from standard node.js 'util' module
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    ctor.prototype = Object.create(superCtor.prototype, {
-	      constructor: {
-	        value: ctor,
-	        enumerable: false,
-	        writable: true,
-	        configurable: true
-	      }
-	    });
-	  };
-	} else {
-	  // old school shim for old browsers
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    var TempCtor = function () {}
-	    TempCtor.prototype = superCtor.prototype
-	    ctor.prototype = new TempCtor()
-	    ctor.prototype.constructor = ctor
-	  }
-	}
-
-
-/***/ },
-/* 31 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(process) {exports = module.exports = __webpack_require__(32);
-	exports.Stream = __webpack_require__(29);
-	exports.Readable = exports;
-	exports.Writable = __webpack_require__(42);
-	exports.Duplex = __webpack_require__(41);
-	exports.Transform = __webpack_require__(44);
-	exports.PassThrough = __webpack_require__(45);
-	if (!process.browser && process.env.READABLE_STREAM === 'disable') {
-	  module.exports = __webpack_require__(29);
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
-
-/***/ },
-/* 32 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(process) {// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	module.exports = Readable;
-
-	/*<replacement>*/
-	var isArray = __webpack_require__(33);
-	/*</replacement>*/
-
-
-	/*<replacement>*/
-	var Buffer = __webpack_require__(34).Buffer;
-	/*</replacement>*/
-
-	Readable.ReadableState = ReadableState;
-
-	var EE = __webpack_require__(1).EventEmitter;
-
-	/*<replacement>*/
-	if (!EE.listenerCount) EE.listenerCount = function(emitter, type) {
-	  return emitter.listeners(type).length;
-	};
-	/*</replacement>*/
-
-	var Stream = __webpack_require__(29);
-
-	/*<replacement>*/
-	var util = __webpack_require__(38);
-	util.inherits = __webpack_require__(39);
-	/*</replacement>*/
-
-	var StringDecoder;
-
-
-	/*<replacement>*/
-	var debug = __webpack_require__(40);
-	if (debug && debug.debuglog) {
-	  debug = debug.debuglog('stream');
-	} else {
-	  debug = function () {};
-	}
-	/*</replacement>*/
-
-
-	util.inherits(Readable, Stream);
-
-	function ReadableState(options, stream) {
-	  var Duplex = __webpack_require__(41);
-
-	  options = options || {};
-
-	  // the point at which it stops calling _read() to fill the buffer
-	  // Note: 0 is a valid value, means "don't call _read preemptively ever"
-	  var hwm = options.highWaterMark;
-	  var defaultHwm = options.objectMode ? 16 : 16 * 1024;
-	  this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;
-
-	  // cast to ints.
-	  this.highWaterMark = ~~this.highWaterMark;
-
-	  this.buffer = [];
-	  this.length = 0;
-	  this.pipes = null;
-	  this.pipesCount = 0;
-	  this.flowing = null;
-	  this.ended = false;
-	  this.endEmitted = false;
-	  this.reading = false;
-
-	  // a flag to be able to tell if the onwrite cb is called immediately,
-	  // or on a later tick.  We set this to true at first, because any
-	  // actions that shouldn't happen until "later" should generally also
-	  // not happen before the first write call.
-	  this.sync = true;
-
-	  // whenever we return null, then we set a flag to say
-	  // that we're awaiting a 'readable' event emission.
-	  this.needReadable = false;
-	  this.emittedReadable = false;
-	  this.readableListening = false;
-
-
-	  // object stream flag. Used to make read(n) ignore n and to
-	  // make all the buffer merging and length checks go away
-	  this.objectMode = !!options.objectMode;
-
-	  if (stream instanceof Duplex)
-	    this.objectMode = this.objectMode || !!options.readableObjectMode;
-
-	  // Crypto is kind of old and crusty.  Historically, its default string
-	  // encoding is 'binary' so we have to make this configurable.
-	  // Everything else in the universe uses 'utf8', though.
-	  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-	  // when piping, we only care about 'readable' events that happen
-	  // after read()ing all the bytes and not getting any pushback.
-	  this.ranOut = false;
-
-	  // the number of writers that are awaiting a drain event in .pipe()s
-	  this.awaitDrain = 0;
-
-	  // if true, a maybeReadMore has been scheduled
-	  this.readingMore = false;
-
-	  this.decoder = null;
-	  this.encoding = null;
-	  if (options.encoding) {
-	    if (!StringDecoder)
-	      StringDecoder = __webpack_require__(43).StringDecoder;
-	    this.decoder = new StringDecoder(options.encoding);
-	    this.encoding = options.encoding;
-	  }
-	}
-
-	function Readable(options) {
-	  var Duplex = __webpack_require__(41);
-
-	  if (!(this instanceof Readable))
-	    return new Readable(options);
-
-	  this._readableState = new ReadableState(options, this);
-
-	  // legacy
-	  this.readable = true;
-
-	  Stream.call(this);
-	}
-
-	// Manually shove something into the read() buffer.
-	// This returns true if the highWaterMark has not been hit yet,
-	// similar to how Writable.write() returns true if you should
-	// write() some more.
-	Readable.prototype.push = function(chunk, encoding) {
-	  var state = this._readableState;
-
-	  if (util.isString(chunk) && !state.objectMode) {
-	    encoding = encoding || state.defaultEncoding;
-	    if (encoding !== state.encoding) {
-	      chunk = new Buffer(chunk, encoding);
-	      encoding = '';
-	    }
-	  }
-
-	  return readableAddChunk(this, state, chunk, encoding, false);
-	};
-
-	// Unshift should *always* be something directly out of read()
-	Readable.prototype.unshift = function(chunk) {
-	  var state = this._readableState;
-	  return readableAddChunk(this, state, chunk, '', true);
-	};
-
-	function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-	  var er = chunkInvalid(state, chunk);
-	  if (er) {
-	    stream.emit('error', er);
-	  } else if (util.isNullOrUndefined(chunk)) {
-	    state.reading = false;
-	    if (!state.ended)
-	      onEofChunk(stream, state);
-	  } else if (state.objectMode || chunk && chunk.length > 0) {
-	    if (state.ended && !addToFront) {
-	      var e = new Error('stream.push() after EOF');
-	      stream.emit('error', e);
-	    } else if (state.endEmitted && addToFront) {
-	      var e = new Error('stream.unshift() after end event');
-	      stream.emit('error', e);
-	    } else {
-	      if (state.decoder && !addToFront && !encoding)
-	        chunk = state.decoder.write(chunk);
-
-	      if (!addToFront)
-	        state.reading = false;
-
-	      // if we want the data now, just emit it.
-	      if (state.flowing && state.length === 0 && !state.sync) {
-	        stream.emit('data', chunk);
-	        stream.read(0);
-	      } else {
-	        // update the buffer info.
-	        state.length += state.objectMode ? 1 : chunk.length;
-	        if (addToFront)
-	          state.buffer.unshift(chunk);
-	        else
-	          state.buffer.push(chunk);
-
-	        if (state.needReadable)
-	          emitReadable(stream);
-	      }
-
-	      maybeReadMore(stream, state);
-	    }
-	  } else if (!addToFront) {
-	    state.reading = false;
-	  }
-
-	  return needMoreData(state);
-	}
-
-
-
-	// if it's past the high water mark, we can push in some more.
-	// Also, if we have no data yet, we can stand some
-	// more bytes.  This is to work around cases where hwm=0,
-	// such as the repl.  Also, if the push() triggered a
-	// readable event, and the user called read(largeNumber) such that
-	// needReadable was set, then we ought to push more, so that another
-	// 'readable' event will be triggered.
-	function needMoreData(state) {
-	  return !state.ended &&
-	         (state.needReadable ||
-	          state.length < state.highWaterMark ||
-	          state.length === 0);
-	}
-
-	// backwards compatibility.
-	Readable.prototype.setEncoding = function(enc) {
-	  if (!StringDecoder)
-	    StringDecoder = __webpack_require__(43).StringDecoder;
-	  this._readableState.decoder = new StringDecoder(enc);
-	  this._readableState.encoding = enc;
-	  return this;
-	};
-
-	// Don't raise the hwm > 128MB
-	var MAX_HWM = 0x800000;
-	function roundUpToNextPowerOf2(n) {
-	  if (n >= MAX_HWM) {
-	    n = MAX_HWM;
-	  } else {
-	    // Get the next highest power of 2
-	    n--;
-	    for (var p = 1; p < 32; p <<= 1) n |= n >> p;
-	    n++;
-	  }
-	  return n;
-	}
-
-	function howMuchToRead(n, state) {
-	  if (state.length === 0 && state.ended)
-	    return 0;
-
-	  if (state.objectMode)
-	    return n === 0 ? 0 : 1;
-
-	  if (isNaN(n) || util.isNull(n)) {
-	    // only flow one buffer at a time
-	    if (state.flowing && state.buffer.length)
-	      return state.buffer[0].length;
-	    else
-	      return state.length;
-	  }
-
-	  if (n <= 0)
-	    return 0;
-
-	  // If we're asking for more than the target buffer level,
-	  // then raise the water mark.  Bump up to the next highest
-	  // power of 2, to prevent increasing it excessively in tiny
-	  // amounts.
-	  if (n > state.highWaterMark)
-	    state.highWaterMark = roundUpToNextPowerOf2(n);
-
-	  // don't have that much.  return null, unless we've ended.
-	  if (n > state.length) {
-	    if (!state.ended) {
-	      state.needReadable = true;
-	      return 0;
-	    } else
-	      return state.length;
-	  }
-
-	  return n;
-	}
-
-	// you can override either this method, or the async _read(n) below.
-	Readable.prototype.read = function(n) {
-	  debug('read', n);
-	  var state = this._readableState;
-	  var nOrig = n;
-
-	  if (!util.isNumber(n) || n > 0)
-	    state.emittedReadable = false;
-
-	  // if we're doing read(0) to trigger a readable event, but we
-	  // already have a bunch of data in the buffer, then just trigger
-	  // the 'readable' event and move on.
-	  if (n === 0 &&
-	      state.needReadable &&
-	      (state.length >= state.highWaterMark || state.ended)) {
-	    debug('read: emitReadable', state.length, state.ended);
-	    if (state.length === 0 && state.ended)
-	      endReadable(this);
-	    else
-	      emitReadable(this);
-	    return null;
-	  }
-
-	  n = howMuchToRead(n, state);
-
-	  // if we've ended, and we're now clear, then finish it up.
-	  if (n === 0 && state.ended) {
-	    if (state.length === 0)
-	      endReadable(this);
-	    return null;
-	  }
-
-	  // All the actual chunk generation logic needs to be
-	  // *below* the call to _read.  The reason is that in certain
-	  // synthetic stream cases, such as passthrough streams, _read
-	  // may be a completely synchronous operation which may change
-	  // the state of the read buffer, providing enough data when
-	  // before there was *not* enough.
-	  //
-	  // So, the steps are:
-	  // 1. Figure out what the state of things will be after we do
-	  // a read from the buffer.
-	  //
-	  // 2. If that resulting state will trigger a _read, then call _read.
-	  // Note that this may be asynchronous, or synchronous.  Yes, it is
-	  // deeply ugly to write APIs this way, but that still doesn't mean
-	  // that the Readable class should behave improperly, as streams are
-	  // designed to be sync/async agnostic.
-	  // Take note if the _read call is sync or async (ie, if the read call
-	  // has returned yet), so that we know whether or not it's safe to emit
-	  // 'readable' etc.
-	  //
-	  // 3. Actually pull the requested chunks out of the buffer and return.
-
-	  // if we need a readable event, then we need to do some reading.
-	  var doRead = state.needReadable;
-	  debug('need readable', doRead);
-
-	  // if we currently have less than the highWaterMark, then also read some
-	  if (state.length === 0 || state.length - n < state.highWaterMark) {
-	    doRead = true;
-	    debug('length less than watermark', doRead);
-	  }
-
-	  // however, if we've ended, then there's no point, and if we're already
-	  // reading, then it's unnecessary.
-	  if (state.ended || state.reading) {
-	    doRead = false;
-	    debug('reading or ended', doRead);
-	  }
-
-	  if (doRead) {
-	    debug('do read');
-	    state.reading = true;
-	    state.sync = true;
-	    // if the length is currently zero, then we *need* a readable event.
-	    if (state.length === 0)
-	      state.needReadable = true;
-	    // call internal read method
-	    this._read(state.highWaterMark);
-	    state.sync = false;
-	  }
-
-	  // If _read pushed data synchronously, then `reading` will be false,
-	  // and we need to re-evaluate how much data we can return to the user.
-	  if (doRead && !state.reading)
-	    n = howMuchToRead(nOrig, state);
-
-	  var ret;
-	  if (n > 0)
-	    ret = fromList(n, state);
-	  else
-	    ret = null;
-
-	  if (util.isNull(ret)) {
-	    state.needReadable = true;
-	    n = 0;
-	  }
-
-	  state.length -= n;
-
-	  // If we have nothing in the buffer, then we want to know
-	  // as soon as we *do* get something into the buffer.
-	  if (state.length === 0 && !state.ended)
-	    state.needReadable = true;
-
-	  // If we tried to read() past the EOF, then emit end on the next tick.
-	  if (nOrig !== n && state.ended && state.length === 0)
-	    endReadable(this);
-
-	  if (!util.isNull(ret))
-	    this.emit('data', ret);
-
-	  return ret;
-	};
-
-	function chunkInvalid(state, chunk) {
-	  var er = null;
-	  if (!util.isBuffer(chunk) &&
-	      !util.isString(chunk) &&
-	      !util.isNullOrUndefined(chunk) &&
-	      !state.objectMode) {
-	    er = new TypeError('Invalid non-string/buffer chunk');
-	  }
-	  return er;
-	}
-
-
-	function onEofChunk(stream, state) {
-	  if (state.decoder && !state.ended) {
-	    var chunk = state.decoder.end();
-	    if (chunk && chunk.length) {
-	      state.buffer.push(chunk);
-	      state.length += state.objectMode ? 1 : chunk.length;
-	    }
-	  }
-	  state.ended = true;
-
-	  // emit 'readable' now to make sure it gets picked up.
-	  emitReadable(stream);
-	}
-
-	// Don't emit readable right away in sync mode, because this can trigger
-	// another read() call => stack overflow.  This way, it might trigger
-	// a nextTick recursion warning, but that's not so bad.
-	function emitReadable(stream) {
-	  var state = stream._readableState;
-	  state.needReadable = false;
-	  if (!state.emittedReadable) {
-	    debug('emitReadable', state.flowing);
-	    state.emittedReadable = true;
-	    if (state.sync)
-	      process.nextTick(function() {
-	        emitReadable_(stream);
-	      });
-	    else
-	      emitReadable_(stream);
-	  }
-	}
-
-	function emitReadable_(stream) {
-	  debug('emit readable');
-	  stream.emit('readable');
-	  flow(stream);
-	}
-
-
-	// at this point, the user has presumably seen the 'readable' event,
-	// and called read() to consume some data.  that may have triggered
-	// in turn another _read(n) call, in which case reading = true if
-	// it's in progress.
-	// However, if we're not ended, or reading, and the length < hwm,
-	// then go ahead and try to read some more preemptively.
-	function maybeReadMore(stream, state) {
-	  if (!state.readingMore) {
-	    state.readingMore = true;
-	    process.nextTick(function() {
-	      maybeReadMore_(stream, state);
-	    });
-	  }
-	}
-
-	function maybeReadMore_(stream, state) {
-	  var len = state.length;
-	  while (!state.reading && !state.flowing && !state.ended &&
-	         state.length < state.highWaterMark) {
-	    debug('maybeReadMore read 0');
-	    stream.read(0);
-	    if (len === state.length)
-	      // didn't get any data, stop spinning.
-	      break;
-	    else
-	      len = state.length;
-	  }
-	  state.readingMore = false;
-	}
-
-	// abstract method.  to be overridden in specific implementation classes.
-	// call cb(er, data) where data is <= n in length.
-	// for virtual (non-string, non-buffer) streams, "length" is somewhat
-	// arbitrary, and perhaps not very meaningful.
-	Readable.prototype._read = function(n) {
-	  this.emit('error', new Error('not implemented'));
-	};
-
-	Readable.prototype.pipe = function(dest, pipeOpts) {
-	  var src = this;
-	  var state = this._readableState;
-
-	  switch (state.pipesCount) {
-	    case 0:
-	      state.pipes = dest;
-	      break;
-	    case 1:
-	      state.pipes = [state.pipes, dest];
-	      break;
-	    default:
-	      state.pipes.push(dest);
-	      break;
-	  }
-	  state.pipesCount += 1;
-	  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-
-	  var doEnd = (!pipeOpts || pipeOpts.end !== false) &&
-	              dest !== process.stdout &&
-	              dest !== process.stderr;
-
-	  var endFn = doEnd ? onend : cleanup;
-	  if (state.endEmitted)
-	    process.nextTick(endFn);
-	  else
-	    src.once('end', endFn);
-
-	  dest.on('unpipe', onunpipe);
-	  function onunpipe(readable) {
-	    debug('onunpipe');
-	    if (readable === src) {
-	      cleanup();
-	    }
-	  }
-
-	  function onend() {
-	    debug('onend');
-	    dest.end();
-	  }
-
-	  // when the dest drains, it reduces the awaitDrain counter
-	  // on the source.  This would be more elegant with a .once()
-	  // handler in flow(), but adding and removing repeatedly is
-	  // too slow.
-	  var ondrain = pipeOnDrain(src);
-	  dest.on('drain', ondrain);
-
-	  function cleanup() {
-	    debug('cleanup');
-	    // cleanup event handlers once the pipe is broken
-	    dest.removeListener('close', onclose);
-	    dest.removeListener('finish', onfinish);
-	    dest.removeListener('drain', ondrain);
-	    dest.removeListener('error', onerror);
-	    dest.removeListener('unpipe', onunpipe);
-	    src.removeListener('end', onend);
-	    src.removeListener('end', cleanup);
-	    src.removeListener('data', ondata);
-
-	    // if the reader is waiting for a drain event from this
-	    // specific writer, then it would cause it to never start
-	    // flowing again.
-	    // So, if this is awaiting a drain, then we just call it now.
-	    // If we don't know, then assume that we are waiting for one.
-	    if (state.awaitDrain &&
-	        (!dest._writableState || dest._writableState.needDrain))
-	      ondrain();
-	  }
-
-	  src.on('data', ondata);
-	  function ondata(chunk) {
-	    debug('ondata');
-	    var ret = dest.write(chunk);
-	    if (false === ret) {
-	      debug('false write response, pause',
-	            src._readableState.awaitDrain);
-	      src._readableState.awaitDrain++;
-	      src.pause();
-	    }
-	  }
-
-	  // if the dest has an error, then stop piping into it.
-	  // however, don't suppress the throwing behavior for this.
-	  function onerror(er) {
-	    debug('onerror', er);
-	    unpipe();
-	    dest.removeListener('error', onerror);
-	    if (EE.listenerCount(dest, 'error') === 0)
-	      dest.emit('error', er);
-	  }
-	  // This is a brutally ugly hack to make sure that our error handler
-	  // is attached before any userland ones.  NEVER DO THIS.
-	  if (!dest._events || !dest._events.error)
-	    dest.on('error', onerror);
-	  else if (isArray(dest._events.error))
-	    dest._events.error.unshift(onerror);
-	  else
-	    dest._events.error = [onerror, dest._events.error];
-
-
-
-	  // Both close and finish should trigger unpipe, but only once.
-	  function onclose() {
-	    dest.removeListener('finish', onfinish);
-	    unpipe();
-	  }
-	  dest.once('close', onclose);
-	  function onfinish() {
-	    debug('onfinish');
-	    dest.removeListener('close', onclose);
-	    unpipe();
-	  }
-	  dest.once('finish', onfinish);
-
-	  function unpipe() {
-	    debug('unpipe');
-	    src.unpipe(dest);
-	  }
-
-	  // tell the dest that it's being piped to
-	  dest.emit('pipe', src);
-
-	  // start the flow if it hasn't been started already.
-	  if (!state.flowing) {
-	    debug('pipe resume');
-	    src.resume();
-	  }
-
-	  return dest;
-	};
-
-	function pipeOnDrain(src) {
-	  return function() {
-	    var state = src._readableState;
-	    debug('pipeOnDrain', state.awaitDrain);
-	    if (state.awaitDrain)
-	      state.awaitDrain--;
-	    if (state.awaitDrain === 0 && EE.listenerCount(src, 'data')) {
-	      state.flowing = true;
-	      flow(src);
-	    }
-	  };
-	}
-
-
-	Readable.prototype.unpipe = function(dest) {
-	  var state = this._readableState;
-
-	  // if we're not piping anywhere, then do nothing.
-	  if (state.pipesCount === 0)
-	    return this;
-
-	  // just one destination.  most common case.
-	  if (state.pipesCount === 1) {
-	    // passed in one, but it's not the right one.
-	    if (dest && dest !== state.pipes)
-	      return this;
-
-	    if (!dest)
-	      dest = state.pipes;
-
-	    // got a match.
-	    state.pipes = null;
-	    state.pipesCount = 0;
-	    state.flowing = false;
-	    if (dest)
-	      dest.emit('unpipe', this);
-	    return this;
-	  }
-
-	  // slow case. multiple pipe destinations.
-
-	  if (!dest) {
-	    // remove all.
-	    var dests = state.pipes;
-	    var len = state.pipesCount;
-	    state.pipes = null;
-	    state.pipesCount = 0;
-	    state.flowing = false;
-
-	    for (var i = 0; i < len; i++)
-	      dests[i].emit('unpipe', this);
-	    return this;
-	  }
-
-	  // try to find the right one.
-	  var i = indexOf(state.pipes, dest);
-	  if (i === -1)
-	    return this;
-
-	  state.pipes.splice(i, 1);
-	  state.pipesCount -= 1;
-	  if (state.pipesCount === 1)
-	    state.pipes = state.pipes[0];
-
-	  dest.emit('unpipe', this);
-
-	  return this;
-	};
-
-	// set up data events if they are asked for
-	// Ensure readable listeners eventually get something
-	Readable.prototype.on = function(ev, fn) {
-	  var res = Stream.prototype.on.call(this, ev, fn);
-
-	  // If listening to data, and it has not explicitly been paused,
-	  // then call resume to start the flow of data on the next tick.
-	  if (ev === 'data' && false !== this._readableState.flowing) {
-	    this.resume();
-	  }
-
-	  if (ev === 'readable' && this.readable) {
-	    var state = this._readableState;
-	    if (!state.readableListening) {
-	      state.readableListening = true;
-	      state.emittedReadable = false;
-	      state.needReadable = true;
-	      if (!state.reading) {
-	        var self = this;
-	        process.nextTick(function() {
-	          debug('readable nexttick read 0');
-	          self.read(0);
-	        });
-	      } else if (state.length) {
-	        emitReadable(this, state);
-	      }
-	    }
-	  }
-
-	  return res;
-	};
-	Readable.prototype.addListener = Readable.prototype.on;
-
-	// pause() and resume() are remnants of the legacy readable stream API
-	// If the user uses them, then switch into old mode.
-	Readable.prototype.resume = function() {
-	  var state = this._readableState;
-	  if (!state.flowing) {
-	    debug('resume');
-	    state.flowing = true;
-	    if (!state.reading) {
-	      debug('resume read 0');
-	      this.read(0);
-	    }
-	    resume(this, state);
-	  }
-	  return this;
-	};
-
-	function resume(stream, state) {
-	  if (!state.resumeScheduled) {
-	    state.resumeScheduled = true;
-	    process.nextTick(function() {
-	      resume_(stream, state);
-	    });
-	  }
-	}
-
-	function resume_(stream, state) {
-	  state.resumeScheduled = false;
-	  stream.emit('resume');
-	  flow(stream);
-	  if (state.flowing && !state.reading)
-	    stream.read(0);
-	}
-
-	Readable.prototype.pause = function() {
-	  debug('call pause flowing=%j', this._readableState.flowing);
-	  if (false !== this._readableState.flowing) {
-	    debug('pause');
-	    this._readableState.flowing = false;
-	    this.emit('pause');
-	  }
-	  return this;
-	};
-
-	function flow(stream) {
-	  var state = stream._readableState;
-	  debug('flow', state.flowing);
-	  if (state.flowing) {
-	    do {
-	      var chunk = stream.read();
-	    } while (null !== chunk && state.flowing);
-	  }
-	}
-
-	// wrap an old-style stream as the async data source.
-	// This is *not* part of the readable stream interface.
-	// It is an ugly unfortunate mess of history.
-	Readable.prototype.wrap = function(stream) {
-	  var state = this._readableState;
-	  var paused = false;
-
-	  var self = this;
-	  stream.on('end', function() {
-	    debug('wrapped end');
-	    if (state.decoder && !state.ended) {
-	      var chunk = state.decoder.end();
-	      if (chunk && chunk.length)
-	        self.push(chunk);
-	    }
-
-	    self.push(null);
-	  });
-
-	  stream.on('data', function(chunk) {
-	    debug('wrapped data');
-	    if (state.decoder)
-	      chunk = state.decoder.write(chunk);
-	    if (!chunk || !state.objectMode && !chunk.length)
-	      return;
-
-	    var ret = self.push(chunk);
-	    if (!ret) {
-	      paused = true;
-	      stream.pause();
-	    }
-	  });
-
-	  // proxy all the other methods.
-	  // important when wrapping filters and duplexes.
-	  for (var i in stream) {
-	    if (util.isFunction(stream[i]) && util.isUndefined(this[i])) {
-	      this[i] = function(method) { return function() {
-	        return stream[method].apply(stream, arguments);
-	      }}(i);
-	    }
-	  }
-
-	  // proxy certain important events.
-	  var events = ['error', 'close', 'destroy', 'pause', 'resume'];
-	  forEach(events, function(ev) {
-	    stream.on(ev, self.emit.bind(self, ev));
-	  });
-
-	  // when we try to consume some more bytes, simply unpause the
-	  // underlying stream.
-	  self._read = function(n) {
-	    debug('wrapped _read', n);
-	    if (paused) {
-	      paused = false;
-	      stream.resume();
-	    }
-	  };
-
-	  return self;
-	};
-
-
-
-	// exposed for testing purposes only.
-	Readable._fromList = fromList;
-
-	// Pluck off n bytes from an array of buffers.
-	// Length is the combined lengths of all the buffers in the list.
-	function fromList(n, state) {
-	  var list = state.buffer;
-	  var length = state.length;
-	  var stringMode = !!state.decoder;
-	  var objectMode = !!state.objectMode;
-	  var ret;
-
-	  // nothing in the list, definitely empty.
-	  if (list.length === 0)
-	    return null;
-
-	  if (length === 0)
-	    ret = null;
-	  else if (objectMode)
-	    ret = list.shift();
-	  else if (!n || n >= length) {
-	    // read it all, truncate the array.
-	    if (stringMode)
-	      ret = list.join('');
-	    else
-	      ret = Buffer.concat(list, length);
-	    list.length = 0;
-	  } else {
-	    // read just some of it.
-	    if (n < list[0].length) {
-	      // just take a part of the first list item.
-	      // slice is the same for buffers and strings.
-	      var buf = list[0];
-	      ret = buf.slice(0, n);
-	      list[0] = buf.slice(n);
-	    } else if (n === list[0].length) {
-	      // first list is a perfect match
-	      ret = list.shift();
-	    } else {
-	      // complex case.
-	      // we have enough to cover it, but it spans past the first buffer.
-	      if (stringMode)
-	        ret = '';
-	      else
-	        ret = new Buffer(n);
-
-	      var c = 0;
-	      for (var i = 0, l = list.length; i < l && c < n; i++) {
-	        var buf = list[0];
-	        var cpy = Math.min(n - c, buf.length);
-
-	        if (stringMode)
-	          ret += buf.slice(0, cpy);
-	        else
-	          buf.copy(ret, c, 0, cpy);
-
-	        if (cpy < buf.length)
-	          list[0] = buf.slice(cpy);
-	        else
-	          list.shift();
-
-	        c += cpy;
-	      }
-	    }
-	  }
-
-	  return ret;
-	}
-
-	function endReadable(stream) {
-	  var state = stream._readableState;
-
-	  // If we get here before consuming all the bytes, then that is a
-	  // bug in node.  Should never happen.
-	  if (state.length > 0)
-	    throw new Error('endReadable called on non-empty stream');
-
-	  if (!state.endEmitted) {
-	    state.ended = true;
-	    process.nextTick(function() {
-	      // Check that we didn't get one last unshift.
-	      if (!state.endEmitted && state.length === 0) {
-	        state.endEmitted = true;
-	        stream.readable = false;
-	        stream.emit('end');
-	      }
-	    });
-	  }
-	}
-
-	function forEach (xs, f) {
-	  for (var i = 0, l = xs.length; i < l; i++) {
-	    f(xs[i], i);
-	  }
-	}
-
-	function indexOf (xs, x) {
-	  for (var i = 0, l = xs.length; i < l; i++) {
-	    if (xs[i] === x) return i;
-	  }
-	  return -1;
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
-
-/***/ },
-/* 33 */
-/***/ function(module, exports) {
-
-	module.exports = Array.isArray || function (arr) {
-	  return Object.prototype.toString.call(arr) == '[object Array]';
-	};
-
-
-/***/ },
-/* 34 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(Buffer, global) {/*!
-	 * The buffer module from node.js, for the browser.
-	 *
-	 * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
-	 * @license  MIT
-	 */
-	/* eslint-disable no-proto */
-
-	'use strict'
-
-	var base64 = __webpack_require__(35)
-	var ieee754 = __webpack_require__(36)
-	var isArray = __webpack_require__(37)
-
-	exports.Buffer = Buffer
-	exports.SlowBuffer = SlowBuffer
-	exports.INSPECT_MAX_BYTES = 50
-	Buffer.poolSize = 8192 // not used by this implementation
-
-	var rootParent = {}
-
-	/**
-	 * If `Buffer.TYPED_ARRAY_SUPPORT`:
-	 *   === true    Use Uint8Array implementation (fastest)
-	 *   === false   Use Object implementation (most compatible, even IE6)
-	 *
-	 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
-	 * Opera 11.6+, iOS 4.2+.
-	 *
-	 * Due to various browser bugs, sometimes the Object implementation will be used even
-	 * when the browser supports typed arrays.
-	 *
-	 * Note:
-	 *
-	 *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
-	 *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
-	 *
-	 *   - Safari 5-7 lacks support for changing the `Object.prototype.constructor` property
-	 *     on objects.
-	 *
-	 *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
-	 *
-	 *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
-	 *     incorrect length in some situations.
-
-	 * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
-	 * get the Object implementation, which is slower but behaves correctly.
-	 */
-	Buffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined
-	  ? global.TYPED_ARRAY_SUPPORT
-	  : typedArraySupport()
-
-	function typedArraySupport () {
-	  function Bar () {}
-	  try {
-	    var arr = new Uint8Array(1)
-	    arr.foo = function () { return 42 }
-	    arr.constructor = Bar
-	    return arr.foo() === 42 && // typed array instances can be augmented
-	        arr.constructor === Bar && // constructor can be set
-	        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`
-	        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`
-	  } catch (e) {
-	    return false
-	  }
-	}
-
-	function kMaxLength () {
-	  return Buffer.TYPED_ARRAY_SUPPORT
-	    ? 0x7fffffff
-	    : 0x3fffffff
-	}
-
-	/**
-	 * Class: Buffer
-	 * =============
-	 *
-	 * The Buffer constructor returns instances of `Uint8Array` that are augmented
-	 * with function properties for all the node `Buffer` API functions. We use
-	 * `Uint8Array` so that square bracket notation works as expected -- it returns
-	 * a single octet.
-	 *
-	 * By augmenting the instances, we can avoid modifying the `Uint8Array`
-	 * prototype.
-	 */
-	function Buffer (arg) {
-	  if (!(this instanceof Buffer)) {
-	    // Avoid going through an ArgumentsAdaptorTrampoline in the common case.
-	    if (arguments.length > 1) return new Buffer(arg, arguments[1])
-	    return new Buffer(arg)
-	  }
-
-	  if (!Buffer.TYPED_ARRAY_SUPPORT) {
-	    this.length = 0
-	    this.parent = undefined
-	  }
-
-	  // Common case.
-	  if (typeof arg === 'number') {
-	    return fromNumber(this, arg)
-	  }
-
-	  // Slightly less common case.
-	  if (typeof arg === 'string') {
-	    return fromString(this, arg, arguments.length > 1 ? arguments[1] : 'utf8')
-	  }
-
-	  // Unusual.
-	  return fromObject(this, arg)
-	}
-
-	function fromNumber (that, length) {
-	  that = allocate(that, length < 0 ? 0 : checked(length) | 0)
-	  if (!Buffer.TYPED_ARRAY_SUPPORT) {
-	    for (var i = 0; i < length; i++) {
-	      that[i] = 0
-	    }
-	  }
-	  return that
-	}
-
-	function fromString (that, string, encoding) {
-	  if (typeof encoding !== 'string' || encoding === '') encoding = 'utf8'
-
-	  // Assumption: byteLength() return value is always < kMaxLength.
-	  var length = byteLength(string, encoding) | 0
-	  that = allocate(that, length)
-
-	  that.write(string, encoding)
-	  return that
-	}
-
-	function fromObject (that, object) {
-	  if (Buffer.isBuffer(object)) return fromBuffer(that, object)
-
-	  if (isArray(object)) return fromArray(that, object)
-
-	  if (object == null) {
-	    throw new TypeError('must start with number, buffer, array or string')
-	  }
-
-	  if (typeof ArrayBuffer !== 'undefined') {
-	    if (object.buffer instanceof ArrayBuffer) {
-	      return fromTypedArray(that, object)
-	    }
-	    if (object instanceof ArrayBuffer) {
-	      return fromArrayBuffer(that, object)
-	    }
-	  }
-
-	  if (object.length) return fromArrayLike(that, object)
-
-	  return fromJsonObject(that, object)
-	}
-
-	function fromBuffer (that, buffer) {
-	  var length = checked(buffer.length) | 0
-	  that = allocate(that, length)
-	  buffer.copy(that, 0, 0, length)
-	  return that
-	}
-
-	function fromArray (that, array) {
-	  var length = checked(array.length) | 0
-	  that = allocate(that, length)
-	  for (var i = 0; i < length; i += 1) {
-	    that[i] = array[i] & 255
-	  }
-	  return that
-	}
-
-	// Duplicate of fromArray() to keep fromArray() monomorphic.
-	function fromTypedArray (that, array) {
-	  var length = checked(array.length) | 0
-	  that = allocate(that, length)
-	  // Truncating the elements is probably not what people expect from typed
-	  // arrays with BYTES_PER_ELEMENT > 1 but it's compatible with the behavior
-	  // of the old Buffer constructor.
-	  for (var i = 0; i < length; i += 1) {
-	    that[i] = array[i] & 255
-	  }
-	  return that
-	}
-
-	function fromArrayBuffer (that, array) {
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    // Return an augmented `Uint8Array` instance, for best performance
-	    array.byteLength
-	    that = Buffer._augment(new Uint8Array(array))
-	  } else {
-	    // Fallback: Return an object instance of the Buffer class
-	    that = fromTypedArray(that, new Uint8Array(array))
-	  }
-	  return that
-	}
-
-	function fromArrayLike (that, array) {
-	  var length = checked(array.length) | 0
-	  that = allocate(that, length)
-	  for (var i = 0; i < length; i += 1) {
-	    that[i] = array[i] & 255
-	  }
-	  return that
-	}
-
-	// Deserialize { type: 'Buffer', data: [1,2,3,...] } into a Buffer object.
-	// Returns a zero-length buffer for inputs that don't conform to the spec.
-	function fromJsonObject (that, object) {
-	  var array
-	  var length = 0
-
-	  if (object.type === 'Buffer' && isArray(object.data)) {
-	    array = object.data
-	    length = checked(array.length) | 0
-	  }
-	  that = allocate(that, length)
-
-	  for (var i = 0; i < length; i += 1) {
-	    that[i] = array[i] & 255
-	  }
-	  return that
-	}
-
-	if (Buffer.TYPED_ARRAY_SUPPORT) {
-	  Buffer.prototype.__proto__ = Uint8Array.prototype
-	  Buffer.__proto__ = Uint8Array
-	} else {
-	  // pre-set for values that may exist in the future
-	  Buffer.prototype.length = undefined
-	  Buffer.prototype.parent = undefined
-	}
-
-	function allocate (that, length) {
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    // Return an augmented `Uint8Array` instance, for best performance
-	    that = Buffer._augment(new Uint8Array(length))
-	    that.__proto__ = Buffer.prototype
-	  } else {
-	    // Fallback: Return an object instance of the Buffer class
-	    that.length = length
-	    that._isBuffer = true
-	  }
-
-	  var fromPool = length !== 0 && length <= Buffer.poolSize >>> 1
-	  if (fromPool) that.parent = rootParent
-
-	  return that
-	}
-
-	function checked (length) {
-	  // Note: cannot use `length < kMaxLength` here because that fails when
-	  // length is NaN (which is otherwise coerced to zero.)
-	  if (length >= kMaxLength()) {
-	    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
-	                         'size: 0x' + kMaxLength().toString(16) + ' bytes')
-	  }
-	  return length | 0
-	}
-
-	function SlowBuffer (subject, encoding) {
-	  if (!(this instanceof SlowBuffer)) return new SlowBuffer(subject, encoding)
-
-	  var buf = new Buffer(subject, encoding)
-	  delete buf.parent
-	  return buf
-	}
-
-	Buffer.isBuffer = function isBuffer (b) {
-	  return !!(b != null && b._isBuffer)
-	}
-
-	Buffer.compare = function compare (a, b) {
-	  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
-	    throw new TypeError('Arguments must be Buffers')
-	  }
-
-	  if (a === b) return 0
-
-	  var x = a.length
-	  var y = b.length
-
-	  var i = 0
-	  var len = Math.min(x, y)
-	  while (i < len) {
-	    if (a[i] !== b[i]) break
-
-	    ++i
-	  }
-
-	  if (i !== len) {
-	    x = a[i]
-	    y = b[i]
-	  }
-
-	  if (x < y) return -1
-	  if (y < x) return 1
-	  return 0
-	}
-
-	Buffer.isEncoding = function isEncoding (encoding) {
-	  switch (String(encoding).toLowerCase()) {
-	    case 'hex':
-	    case 'utf8':
-	    case 'utf-8':
-	    case 'ascii':
-	    case 'binary':
-	    case 'base64':
-	    case 'raw':
-	    case 'ucs2':
-	    case 'ucs-2':
-	    case 'utf16le':
-	    case 'utf-16le':
-	      return true
-	    default:
-	      return false
-	  }
-	}
-
-	Buffer.concat = function concat (list, length) {
-	  if (!isArray(list)) throw new TypeError('list argument must be an Array of Buffers.')
-
-	  if (list.length === 0) {
-	    return new Buffer(0)
-	  }
-
-	  var i
-	  if (length === undefined) {
-	    length = 0
-	    for (i = 0; i < list.length; i++) {
-	      length += list[i].length
-	    }
-	  }
-
-	  var buf = new Buffer(length)
-	  var pos = 0
-	  for (i = 0; i < list.length; i++) {
-	    var item = list[i]
-	    item.copy(buf, pos)
-	    pos += item.length
-	  }
-	  return buf
-	}
-
-	function byteLength (string, encoding) {
-	  if (typeof string !== 'string') string = '' + string
-
-	  var len = string.length
-	  if (len === 0) return 0
-
-	  // Use a for loop to avoid recursion
-	  var loweredCase = false
-	  for (;;) {
-	    switch (encoding) {
-	      case 'ascii':
-	      case 'binary':
-	      // Deprecated
-	      case 'raw':
-	      case 'raws':
-	        return len
-	      case 'utf8':
-	      case 'utf-8':
-	        return utf8ToBytes(string).length
-	      case 'ucs2':
-	      case 'ucs-2':
-	      case 'utf16le':
-	      case 'utf-16le':
-	        return len * 2
-	      case 'hex':
-	        return len >>> 1
-	      case 'base64':
-	        return base64ToBytes(string).length
-	      default:
-	        if (loweredCase) return utf8ToBytes(string).length // assume utf8
-	        encoding = ('' + encoding).toLowerCase()
-	        loweredCase = true
-	    }
-	  }
-	}
-	Buffer.byteLength = byteLength
-
-	function slowToString (encoding, start, end) {
-	  var loweredCase = false
-
-	  start = start | 0
-	  end = end === undefined || end === Infinity ? this.length : end | 0
-
-	  if (!encoding) encoding = 'utf8'
-	  if (start < 0) start = 0
-	  if (end > this.length) end = this.length
-	  if (end <= start) return ''
-
-	  while (true) {
-	    switch (encoding) {
-	      case 'hex':
-	        return hexSlice(this, start, end)
-
-	      case 'utf8':
-	      case 'utf-8':
-	        return utf8Slice(this, start, end)
-
-	      case 'ascii':
-	        return asciiSlice(this, start, end)
-
-	      case 'binary':
-	        return binarySlice(this, start, end)
-
-	      case 'base64':
-	        return base64Slice(this, start, end)
-
-	      case 'ucs2':
-	      case 'ucs-2':
-	      case 'utf16le':
-	      case 'utf-16le':
-	        return utf16leSlice(this, start, end)
-
-	      default:
-	        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-	        encoding = (encoding + '').toLowerCase()
-	        loweredCase = true
-	    }
-	  }
-	}
-
-	Buffer.prototype.toString = function toString () {
-	  var length = this.length | 0
-	  if (length === 0) return ''
-	  if (arguments.length === 0) return utf8Slice(this, 0, length)
-	  return slowToString.apply(this, arguments)
-	}
-
-	Buffer.prototype.equals = function equals (b) {
-	  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
-	  if (this === b) return true
-	  return Buffer.compare(this, b) === 0
-	}
-
-	Buffer.prototype.inspect = function inspect () {
-	  var str = ''
-	  var max = exports.INSPECT_MAX_BYTES
-	  if (this.length > 0) {
-	    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
-	    if (this.length > max) str += ' ... '
-	  }
-	  return '<Buffer ' + str + '>'
-	}
-
-	Buffer.prototype.compare = function compare (b) {
-	  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
-	  if (this === b) return 0
-	  return Buffer.compare(this, b)
-	}
-
-	Buffer.prototype.indexOf = function indexOf (val, byteOffset) {
-	  if (byteOffset > 0x7fffffff) byteOffset = 0x7fffffff
-	  else if (byteOffset < -0x80000000) byteOffset = -0x80000000
-	  byteOffset >>= 0
-
-	  if (this.length === 0) return -1
-	  if (byteOffset >= this.length) return -1
-
-	  // Negative offsets start from the end of the buffer
-	  if (byteOffset < 0) byteOffset = Math.max(this.length + byteOffset, 0)
-
-	  if (typeof val === 'string') {
-	    if (val.length === 0) return -1 // special case: looking for empty string always fails
-	    return String.prototype.indexOf.call(this, val, byteOffset)
-	  }
-	  if (Buffer.isBuffer(val)) {
-	    return arrayIndexOf(this, val, byteOffset)
-	  }
-	  if (typeof val === 'number') {
-	    if (Buffer.TYPED_ARRAY_SUPPORT && Uint8Array.prototype.indexOf === 'function') {
-	      return Uint8Array.prototype.indexOf.call(this, val, byteOffset)
-	    }
-	    return arrayIndexOf(this, [ val ], byteOffset)
-	  }
-
-	  function arrayIndexOf (arr, val, byteOffset) {
-	    var foundIndex = -1
-	    for (var i = 0; byteOffset + i < arr.length; i++) {
-	      if (arr[byteOffset + i] === val[foundIndex === -1 ? 0 : i - foundIndex]) {
-	        if (foundIndex === -1) foundIndex = i
-	        if (i - foundIndex + 1 === val.length) return byteOffset + foundIndex
-	      } else {
-	        foundIndex = -1
-	      }
-	    }
-	    return -1
-	  }
-
-	  throw new TypeError('val must be string, number or Buffer')
-	}
-
-	// `get` is deprecated
-	Buffer.prototype.get = function get (offset) {
-	  console.log('.get() is deprecated. Access using array indexes instead.')
-	  return this.readUInt8(offset)
-	}
-
-	// `set` is deprecated
-	Buffer.prototype.set = function set (v, offset) {
-	  console.log('.set() is deprecated. Access using array indexes instead.')
-	  return this.writeUInt8(v, offset)
-	}
-
-	function hexWrite (buf, string, offset, length) {
-	  offset = Number(offset) || 0
-	  var remaining = buf.length - offset
-	  if (!length) {
-	    length = remaining
-	  } else {
-	    length = Number(length)
-	    if (length > remaining) {
-	      length = remaining
-	    }
-	  }
-
-	  // must be an even number of digits
-	  var strLen = string.length
-	  if (strLen % 2 !== 0) throw new Error('Invalid hex string')
-
-	  if (length > strLen / 2) {
-	    length = strLen / 2
-	  }
-	  for (var i = 0; i < length; i++) {
-	    var parsed = parseInt(string.substr(i * 2, 2), 16)
-	    if (isNaN(parsed)) throw new Error('Invalid hex string')
-	    buf[offset + i] = parsed
-	  }
-	  return i
-	}
-
-	function utf8Write (buf, string, offset, length) {
-	  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
-	}
-
-	function asciiWrite (buf, string, offset, length) {
-	  return blitBuffer(asciiToBytes(string), buf, offset, length)
-	}
-
-	function binaryWrite (buf, string, offset, length) {
-	  return asciiWrite(buf, string, offset, length)
-	}
-
-	function base64Write (buf, string, offset, length) {
-	  return blitBuffer(base64ToBytes(string), buf, offset, length)
-	}
-
-	function ucs2Write (buf, string, offset, length) {
-	  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
-	}
-
-	Buffer.prototype.write = function write (string, offset, length, encoding) {
-	  // Buffer#write(string)
-	  if (offset === undefined) {
-	    encoding = 'utf8'
-	    length = this.length
-	    offset = 0
-	  // Buffer#write(string, encoding)
-	  } else if (length === undefined && typeof offset === 'string') {
-	    encoding = offset
-	    length = this.length
-	    offset = 0
-	  // Buffer#write(string, offset[, length][, encoding])
-	  } else if (isFinite(offset)) {
-	    offset = offset | 0
-	    if (isFinite(length)) {
-	      length = length | 0
-	      if (encoding === undefined) encoding = 'utf8'
-	    } else {
-	      encoding = length
-	      length = undefined
-	    }
-	  // legacy write(string, encoding, offset, length) - remove in v0.13
-	  } else {
-	    var swap = encoding
-	    encoding = offset
-	    offset = length | 0
-	    length = swap
-	  }
-
-	  var remaining = this.length - offset
-	  if (length === undefined || length > remaining) length = remaining
-
-	  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
-	    throw new RangeError('attempt to write outside buffer bounds')
-	  }
-
-	  if (!encoding) encoding = 'utf8'
-
-	  var loweredCase = false
-	  for (;;) {
-	    switch (encoding) {
-	      case 'hex':
-	        return hexWrite(this, string, offset, length)
-
-	      case 'utf8':
-	      case 'utf-8':
-	        return utf8Write(this, string, offset, length)
-
-	      case 'ascii':
-	        return asciiWrite(this, string, offset, length)
-
-	      case 'binary':
-	        return binaryWrite(this, string, offset, length)
-
-	      case 'base64':
-	        // Warning: maxLength not taken into account in base64Write
-	        return base64Write(this, string, offset, length)
-
-	      case 'ucs2':
-	      case 'ucs-2':
-	      case 'utf16le':
-	      case 'utf-16le':
-	        return ucs2Write(this, string, offset, length)
-
-	      default:
-	        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-	        encoding = ('' + encoding).toLowerCase()
-	        loweredCase = true
-	    }
-	  }
-	}
-
-	Buffer.prototype.toJSON = function toJSON () {
-	  return {
-	    type: 'Buffer',
-	    data: Array.prototype.slice.call(this._arr || this, 0)
-	  }
-	}
-
-	function base64Slice (buf, start, end) {
-	  if (start === 0 && end === buf.length) {
-	    return base64.fromByteArray(buf)
-	  } else {
-	    return base64.fromByteArray(buf.slice(start, end))
-	  }
-	}
-
-	function utf8Slice (buf, start, end) {
-	  end = Math.min(buf.length, end)
-	  var res = []
-
-	  var i = start
-	  while (i < end) {
-	    var firstByte = buf[i]
-	    var codePoint = null
-	    var bytesPerSequence = (firstByte > 0xEF) ? 4
-	      : (firstByte > 0xDF) ? 3
-	      : (firstByte > 0xBF) ? 2
-	      : 1
-
-	    if (i + bytesPerSequence <= end) {
-	      var secondByte, thirdByte, fourthByte, tempCodePoint
-
-	      switch (bytesPerSequence) {
-	        case 1:
-	          if (firstByte < 0x80) {
-	            codePoint = firstByte
-	          }
-	          break
-	        case 2:
-	          secondByte = buf[i + 1]
-	          if ((secondByte & 0xC0) === 0x80) {
-	            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
-	            if (tempCodePoint > 0x7F) {
-	              codePoint = tempCodePoint
-	            }
-	          }
-	          break
-	        case 3:
-	          secondByte = buf[i + 1]
-	          thirdByte = buf[i + 2]
-	          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
-	            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
-	            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
-	              codePoint = tempCodePoint
-	            }
-	          }
-	          break
-	        case 4:
-	          secondByte = buf[i + 1]
-	          thirdByte = buf[i + 2]
-	          fourthByte = buf[i + 3]
-	          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
-	            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
-	            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
-	              codePoint = tempCodePoint
-	            }
-	          }
-	      }
-	    }
-
-	    if (codePoint === null) {
-	      // we did not generate a valid codePoint so insert a
-	      // replacement char (U+FFFD) and advance only 1 byte
-	      codePoint = 0xFFFD
-	      bytesPerSequence = 1
-	    } else if (codePoint > 0xFFFF) {
-	      // encode to utf16 (surrogate pair dance)
-	      codePoint -= 0x10000
-	      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
-	      codePoint = 0xDC00 | codePoint & 0x3FF
-	    }
-
-	    res.push(codePoint)
-	    i += bytesPerSequence
-	  }
-
-	  return decodeCodePointsArray(res)
-	}
-
-	// Based on http://stackoverflow.com/a/22747272/680742, the browser with
-	// the lowest limit is Chrome, with 0x10000 args.
-	// We go 1 magnitude less, for safety
-	var MAX_ARGUMENTS_LENGTH = 0x1000
-
-	function decodeCodePointsArray (codePoints) {
-	  var len = codePoints.length
-	  if (len <= MAX_ARGUMENTS_LENGTH) {
-	    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
-	  }
-
-	  // Decode in chunks to avoid "call stack size exceeded".
-	  var res = ''
-	  var i = 0
-	  while (i < len) {
-	    res += String.fromCharCode.apply(
-	      String,
-	      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
-	    )
-	  }
-	  return res
-	}
-
-	function asciiSlice (buf, start, end) {
-	  var ret = ''
-	  end = Math.min(buf.length, end)
-
-	  for (var i = start; i < end; i++) {
-	    ret += String.fromCharCode(buf[i] & 0x7F)
-	  }
-	  return ret
-	}
-
-	function binarySlice (buf, start, end) {
-	  var ret = ''
-	  end = Math.min(buf.length, end)
-
-	  for (var i = start; i < end; i++) {
-	    ret += String.fromCharCode(buf[i])
-	  }
-	  return ret
-	}
-
-	function hexSlice (buf, start, end) {
-	  var len = buf.length
-
-	  if (!start || start < 0) start = 0
-	  if (!end || end < 0 || end > len) end = len
-
-	  var out = ''
-	  for (var i = start; i < end; i++) {
-	    out += toHex(buf[i])
-	  }
-	  return out
-	}
-
-	function utf16leSlice (buf, start, end) {
-	  var bytes = buf.slice(start, end)
-	  var res = ''
-	  for (var i = 0; i < bytes.length; i += 2) {
-	    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)
-	  }
-	  return res
-	}
-
-	Buffer.prototype.slice = function slice (start, end) {
-	  var len = this.length
-	  start = ~~start
-	  end = end === undefined ? len : ~~end
-
-	  if (start < 0) {
-	    start += len
-	    if (start < 0) start = 0
-	  } else if (start > len) {
-	    start = len
-	  }
-
-	  if (end < 0) {
-	    end += len
-	    if (end < 0) end = 0
-	  } else if (end > len) {
-	    end = len
-	  }
-
-	  if (end < start) end = start
-
-	  var newBuf
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    newBuf = Buffer._augment(this.subarray(start, end))
-	  } else {
-	    var sliceLen = end - start
-	    newBuf = new Buffer(sliceLen, undefined)
-	    for (var i = 0; i < sliceLen; i++) {
-	      newBuf[i] = this[i + start]
-	    }
-	  }
-
-	  if (newBuf.length) newBuf.parent = this.parent || this
-
-	  return newBuf
-	}
-
-	/*
-	 * Need to make sure that buffer isn't trying to write out of bounds.
-	 */
-	function checkOffset (offset, ext, length) {
-	  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
-	  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
-	}
-
-	Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
-	  offset = offset | 0
-	  byteLength = byteLength | 0
-	  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-	  var val = this[offset]
-	  var mul = 1
-	  var i = 0
-	  while (++i < byteLength && (mul *= 0x100)) {
-	    val += this[offset + i] * mul
-	  }
-
-	  return val
-	}
-
-	Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
-	  offset = offset | 0
-	  byteLength = byteLength | 0
-	  if (!noAssert) {
-	    checkOffset(offset, byteLength, this.length)
-	  }
-
-	  var val = this[offset + --byteLength]
-	  var mul = 1
-	  while (byteLength > 0 && (mul *= 0x100)) {
-	    val += this[offset + --byteLength] * mul
-	  }
-
-	  return val
-	}
-
-	Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 1, this.length)
-	  return this[offset]
-	}
-
-	Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 2, this.length)
-	  return this[offset] | (this[offset + 1] << 8)
-	}
-
-	Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 2, this.length)
-	  return (this[offset] << 8) | this[offset + 1]
-	}
-
-	Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 4, this.length)
-
-	  return ((this[offset]) |
-	      (this[offset + 1] << 8) |
-	      (this[offset + 2] << 16)) +
-	      (this[offset + 3] * 0x1000000)
-	}
-
-	Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 4, this.length)
-
-	  return (this[offset] * 0x1000000) +
-	    ((this[offset + 1] << 16) |
-	    (this[offset + 2] << 8) |
-	    this[offset + 3])
-	}
-
-	Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
-	  offset = offset | 0
-	  byteLength = byteLength | 0
-	  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-	  var val = this[offset]
-	  var mul = 1
-	  var i = 0
-	  while (++i < byteLength && (mul *= 0x100)) {
-	    val += this[offset + i] * mul
-	  }
-	  mul *= 0x80
-
-	  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
-
-	  return val
-	}
-
-	Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
-	  offset = offset | 0
-	  byteLength = byteLength | 0
-	  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-	  var i = byteLength
-	  var mul = 1
-	  var val = this[offset + --i]
-	  while (i > 0 && (mul *= 0x100)) {
-	    val += this[offset + --i] * mul
-	  }
-	  mul *= 0x80
-
-	  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
-
-	  return val
-	}
-
-	Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 1, this.length)
-	  if (!(this[offset] & 0x80)) return (this[offset])
-	  return ((0xff - this[offset] + 1) * -1)
-	}
-
-	Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 2, this.length)
-	  var val = this[offset] | (this[offset + 1] << 8)
-	  return (val & 0x8000) ? val | 0xFFFF0000 : val
-	}
-
-	Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 2, this.length)
-	  var val = this[offset + 1] | (this[offset] << 8)
-	  return (val & 0x8000) ? val | 0xFFFF0000 : val
-	}
-
-	Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 4, this.length)
-
-	  return (this[offset]) |
-	    (this[offset + 1] << 8) |
-	    (this[offset + 2] << 16) |
-	    (this[offset + 3] << 24)
-	}
-
-	Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 4, this.length)
-
-	  return (this[offset] << 24) |
-	    (this[offset + 1] << 16) |
-	    (this[offset + 2] << 8) |
-	    (this[offset + 3])
-	}
-
-	Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 4, this.length)
-	  return ieee754.read(this, offset, true, 23, 4)
-	}
-
-	Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 4, this.length)
-	  return ieee754.read(this, offset, false, 23, 4)
-	}
-
-	Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 8, this.length)
-	  return ieee754.read(this, offset, true, 52, 8)
-	}
-
-	Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
-	  if (!noAssert) checkOffset(offset, 8, this.length)
-	  return ieee754.read(this, offset, false, 52, 8)
-	}
-
-	function checkInt (buf, value, offset, ext, max, min) {
-	  if (!Buffer.isBuffer(buf)) throw new TypeError('buffer must be a Buffer instance')
-	  if (value > max || value < min) throw new RangeError('value is out of bounds')
-	  if (offset + ext > buf.length) throw new RangeError('index out of range')
-	}
-
-	Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  byteLength = byteLength | 0
-	  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
-
-	  var mul = 1
-	  var i = 0
-	  this[offset] = value & 0xFF
-	  while (++i < byteLength && (mul *= 0x100)) {
-	    this[offset + i] = (value / mul) & 0xFF
-	  }
-
-	  return offset + byteLength
-	}
-
-	Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  byteLength = byteLength | 0
-	  if (!noAssert) checkInt(this, value, offset, byteLength, Math.pow(2, 8 * byteLength), 0)
-
-	  var i = byteLength - 1
-	  var mul = 1
-	  this[offset + i] = value & 0xFF
-	  while (--i >= 0 && (mul *= 0x100)) {
-	    this[offset + i] = (value / mul) & 0xFF
-	  }
-
-	  return offset + byteLength
-	}
-
-	Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
-	  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
-	  this[offset] = (value & 0xff)
-	  return offset + 1
-	}
-
-	function objectWriteUInt16 (buf, value, offset, littleEndian) {
-	  if (value < 0) value = 0xffff + value + 1
-	  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; i++) {
-	    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
-	      (littleEndian ? i : 1 - i) * 8
-	  }
-	}
-
-	Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset] = (value & 0xff)
-	    this[offset + 1] = (value >>> 8)
-	  } else {
-	    objectWriteUInt16(this, value, offset, true)
-	  }
-	  return offset + 2
-	}
-
-	Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset] = (value >>> 8)
-	    this[offset + 1] = (value & 0xff)
-	  } else {
-	    objectWriteUInt16(this, value, offset, false)
-	  }
-	  return offset + 2
-	}
-
-	function objectWriteUInt32 (buf, value, offset, littleEndian) {
-	  if (value < 0) value = 0xffffffff + value + 1
-	  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; i++) {
-	    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff
-	  }
-	}
-
-	Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset + 3] = (value >>> 24)
-	    this[offset + 2] = (value >>> 16)
-	    this[offset + 1] = (value >>> 8)
-	    this[offset] = (value & 0xff)
-	  } else {
-	    objectWriteUInt32(this, value, offset, true)
-	  }
-	  return offset + 4
-	}
-
-	Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset] = (value >>> 24)
-	    this[offset + 1] = (value >>> 16)
-	    this[offset + 2] = (value >>> 8)
-	    this[offset + 3] = (value & 0xff)
-	  } else {
-	    objectWriteUInt32(this, value, offset, false)
-	  }
-	  return offset + 4
-	}
-
-	Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) {
-	    var limit = Math.pow(2, 8 * byteLength - 1)
-
-	    checkInt(this, value, offset, byteLength, limit - 1, -limit)
-	  }
-
-	  var i = 0
-	  var mul = 1
-	  var sub = value < 0 ? 1 : 0
-	  this[offset] = value & 0xFF
-	  while (++i < byteLength && (mul *= 0x100)) {
-	    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
-	  }
-
-	  return offset + byteLength
-	}
-
-	Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) {
-	    var limit = Math.pow(2, 8 * byteLength - 1)
-
-	    checkInt(this, value, offset, byteLength, limit - 1, -limit)
-	  }
-
-	  var i = byteLength - 1
-	  var mul = 1
-	  var sub = value < 0 ? 1 : 0
-	  this[offset + i] = value & 0xFF
-	  while (--i >= 0 && (mul *= 0x100)) {
-	    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
-	  }
-
-	  return offset + byteLength
-	}
-
-	Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
-	  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)
-	  if (value < 0) value = 0xff + value + 1
-	  this[offset] = (value & 0xff)
-	  return offset + 1
-	}
-
-	Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset] = (value & 0xff)
-	    this[offset + 1] = (value >>> 8)
-	  } else {
-	    objectWriteUInt16(this, value, offset, true)
-	  }
-	  return offset + 2
-	}
-
-	Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset] = (value >>> 8)
-	    this[offset + 1] = (value & 0xff)
-	  } else {
-	    objectWriteUInt16(this, value, offset, false)
-	  }
-	  return offset + 2
-	}
-
-	Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset] = (value & 0xff)
-	    this[offset + 1] = (value >>> 8)
-	    this[offset + 2] = (value >>> 16)
-	    this[offset + 3] = (value >>> 24)
-	  } else {
-	    objectWriteUInt32(this, value, offset, true)
-	  }
-	  return offset + 4
-	}
-
-	Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
-	  value = +value
-	  offset = offset | 0
-	  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
-	  if (value < 0) value = 0xffffffff + value + 1
-	  if (Buffer.TYPED_ARRAY_SUPPORT) {
-	    this[offset] = (value >>> 24)
-	    this[offset + 1] = (value >>> 16)
-	    this[offset + 2] = (value >>> 8)
-	    this[offset + 3] = (value & 0xff)
-	  } else {
-	    objectWriteUInt32(this, value, offset, false)
-	  }
-	  return offset + 4
-	}
-
-	function checkIEEE754 (buf, value, offset, ext, max, min) {
-	  if (value > max || value < min) throw new RangeError('value is out of bounds')
-	  if (offset + ext > buf.length) throw new RangeError('index out of range')
-	  if (offset < 0) throw new RangeError('index out of range')
-	}
-
-	function writeFloat (buf, value, offset, littleEndian, noAssert) {
-	  if (!noAssert) {
-	    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
-	  }
-	  ieee754.write(buf, value, offset, littleEndian, 23, 4)
-	  return offset + 4
-	}
-
-	Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
-	  return writeFloat(this, value, offset, true, noAssert)
-	}
-
-	Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
-	  return writeFloat(this, value, offset, false, noAssert)
-	}
-
-	function writeDouble (buf, value, offset, littleEndian, noAssert) {
-	  if (!noAssert) {
-	    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
-	  }
-	  ieee754.write(buf, value, offset, littleEndian, 52, 8)
-	  return offset + 8
-	}
-
-	Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
-	  return writeDouble(this, value, offset, true, noAssert)
-	}
-
-	Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
-	  return writeDouble(this, value, offset, false, noAssert)
-	}
-
-	// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
-	Buffer.prototype.copy = function copy (target, targetStart, start, end) {
-	  if (!start) start = 0
-	  if (!end && end !== 0) end = this.length
-	  if (targetStart >= target.length) targetStart = target.length
-	  if (!targetStart) targetStart = 0
-	  if (end > 0 && end < start) end = start
-
-	  // Copy 0 bytes; we're done
-	  if (end === start) return 0
-	  if (target.length === 0 || this.length === 0) return 0
-
-	  // Fatal error conditions
-	  if (targetStart < 0) {
-	    throw new RangeError('targetStart out of bounds')
-	  }
-	  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
-	  if (end < 0) throw new RangeError('sourceEnd out of bounds')
-
-	  // Are we oob?
-	  if (end > this.length) end = this.length
-	  if (target.length - targetStart < end - start) {
-	    end = target.length - targetStart + start
-	  }
-
-	  var len = end - start
-	  var i
-
-	  if (this === target && start < targetStart && targetStart < end) {
-	    // descending copy from end
-	    for (i = len - 1; i >= 0; i--) {
-	      target[i + targetStart] = this[i + start]
-	    }
-	  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
-	    // ascending copy from start
-	    for (i = 0; i < len; i++) {
-	      target[i + targetStart] = this[i + start]
-	    }
-	  } else {
-	    target._set(this.subarray(start, start + len), targetStart)
-	  }
-
-	  return len
-	}
-
-	// fill(value, start=0, end=buffer.length)
-	Buffer.prototype.fill = function fill (value, start, end) {
-	  if (!value) value = 0
-	  if (!start) start = 0
-	  if (!end) end = this.length
-
-	  if (end < start) throw new RangeError('end < start')
-
-	  // Fill 0 bytes; we're done
-	  if (end === start) return
-	  if (this.length === 0) return
-
-	  if (start < 0 || start >= this.length) throw new RangeError('start out of bounds')
-	  if (end < 0 || end > this.length) throw new RangeError('end out of bounds')
-
-	  var i
-	  if (typeof value === 'number') {
-	    for (i = start; i < end; i++) {
-	      this[i] = value
-	    }
-	  } else {
-	    var bytes = utf8ToBytes(value.toString())
-	    var len = bytes.length
-	    for (i = start; i < end; i++) {
-	      this[i] = bytes[i % len]
-	    }
-	  }
-
-	  return this
-	}
-
-	/**
-	 * Creates a new `ArrayBuffer` with the *copied* memory of the buffer instance.
-	 * Added in Node 0.12. Only available in browsers that support ArrayBuffer.
-	 */
-	Buffer.prototype.toArrayBuffer = function toArrayBuffer () {
-	  if (typeof Uint8Array !== 'undefined') {
-	    if (Buffer.TYPED_ARRAY_SUPPORT) {
-	      return (new Buffer(this)).buffer
-	    } else {
-	      var buf = new Uint8Array(this.length)
-	      for (var i = 0, len = buf.length; i < len; i += 1) {
-	        buf[i] = this[i]
-	      }
-	      return buf.buffer
-	    }
-	  } else {
-	    throw new TypeError('Buffer.toArrayBuffer not supported in this browser')
-	  }
-	}
-
-	// HELPER FUNCTIONS
-	// ================
-
-	var BP = Buffer.prototype
-
-	/**
-	 * Augment a Uint8Array *instance* (not the Uint8Array class!) with Buffer methods
-	 */
-	Buffer._augment = function _augment (arr) {
-	  arr.constructor = Buffer
-	  arr._isBuffer = true
-
-	  // save reference to original Uint8Array set method before overwriting
-	  arr._set = arr.set
-
-	  // deprecated
-	  arr.get = BP.get
-	  arr.set = BP.set
-
-	  arr.write = BP.write
-	  arr.toString = BP.toString
-	  arr.toLocaleString = BP.toString
-	  arr.toJSON = BP.toJSON
-	  arr.equals = BP.equals
-	  arr.compare = BP.compare
-	  arr.indexOf = BP.indexOf
-	  arr.copy = BP.copy
-	  arr.slice = BP.slice
-	  arr.readUIntLE = BP.readUIntLE
-	  arr.readUIntBE = BP.readUIntBE
-	  arr.readUInt8 = BP.readUInt8
-	  arr.readUInt16LE = BP.readUInt16LE
-	  arr.readUInt16BE = BP.readUInt16BE
-	  arr.readUInt32LE = BP.readUInt32LE
-	  arr.readUInt32BE = BP.readUInt32BE
-	  arr.readIntLE = BP.readIntLE
-	  arr.readIntBE = BP.readIntBE
-	  arr.readInt8 = BP.readInt8
-	  arr.readInt16LE = BP.readInt16LE
-	  arr.readInt16BE = BP.readInt16BE
-	  arr.readInt32LE = BP.readInt32LE
-	  arr.readInt32BE = BP.readInt32BE
-	  arr.readFloatLE = BP.readFloatLE
-	  arr.readFloatBE = BP.readFloatBE
-	  arr.readDoubleLE = BP.readDoubleLE
-	  arr.readDoubleBE = BP.readDoubleBE
-	  arr.writeUInt8 = BP.writeUInt8
-	  arr.writeUIntLE = BP.writeUIntLE
-	  arr.writeUIntBE = BP.writeUIntBE
-	  arr.writeUInt16LE = BP.writeUInt16LE
-	  arr.writeUInt16BE = BP.writeUInt16BE
-	  arr.writeUInt32LE = BP.writeUInt32LE
-	  arr.writeUInt32BE = BP.writeUInt32BE
-	  arr.writeIntLE = BP.writeIntLE
-	  arr.writeIntBE = BP.writeIntBE
-	  arr.writeInt8 = BP.writeInt8
-	  arr.writeInt16LE = BP.writeInt16LE
-	  arr.writeInt16BE = BP.writeInt16BE
-	  arr.writeInt32LE = BP.writeInt32LE
-	  arr.writeInt32BE = BP.writeInt32BE
-	  arr.writeFloatLE = BP.writeFloatLE
-	  arr.writeFloatBE = BP.writeFloatBE
-	  arr.writeDoubleLE = BP.writeDoubleLE
-	  arr.writeDoubleBE = BP.writeDoubleBE
-	  arr.fill = BP.fill
-	  arr.inspect = BP.inspect
-	  arr.toArrayBuffer = BP.toArrayBuffer
-
-	  return arr
-	}
-
-	var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g
-
-	function base64clean (str) {
-	  // Node strips out invalid characters like \n and \t from the string, base64-js does not
-	  str = stringtrim(str).replace(INVALID_BASE64_RE, '')
-	  // Node converts strings with length < 2 to ''
-	  if (str.length < 2) return ''
-	  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
-	  while (str.length % 4 !== 0) {
-	    str = str + '='
-	  }
-	  return str
-	}
-
-	function stringtrim (str) {
-	  if (str.trim) return str.trim()
-	  return str.replace(/^\s+|\s+$/g, '')
-	}
-
-	function toHex (n) {
-	  if (n < 16) return '0' + n.toString(16)
-	  return n.toString(16)
-	}
-
-	function utf8ToBytes (string, units) {
-	  units = units || Infinity
-	  var codePoint
-	  var length = string.length
-	  var leadSurrogate = null
-	  var bytes = []
-
-	  for (var i = 0; i < length; i++) {
-	    codePoint = string.charCodeAt(i)
-
-	    // is surrogate component
-	    if (codePoint > 0xD7FF && codePoint < 0xE000) {
-	      // last char was a lead
-	      if (!leadSurrogate) {
-	        // no lead yet
-	        if (codePoint > 0xDBFF) {
-	          // unexpected trail
-	          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-	          continue
-	        } else if (i + 1 === length) {
-	          // unpaired lead
-	          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-	          continue
-	        }
-
-	        // valid lead
-	        leadSurrogate = codePoint
-
-	        continue
-	      }
-
-	      // 2 leads in a row
-	      if (codePoint < 0xDC00) {
-	        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-	        leadSurrogate = codePoint
-	        continue
-	      }
-
-	      // valid surrogate pair
-	      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
-	    } else if (leadSurrogate) {
-	      // valid bmp char, but last char was a lead
-	      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-	    }
-
-	    leadSurrogate = null
-
-	    // encode utf8
-	    if (codePoint < 0x80) {
-	      if ((units -= 1) < 0) break
-	      bytes.push(codePoint)
-	    } else if (codePoint < 0x800) {
-	      if ((units -= 2) < 0) break
-	      bytes.push(
-	        codePoint >> 0x6 | 0xC0,
-	        codePoint & 0x3F | 0x80
-	      )
-	    } else if (codePoint < 0x10000) {
-	      if ((units -= 3) < 0) break
-	      bytes.push(
-	        codePoint >> 0xC | 0xE0,
-	        codePoint >> 0x6 & 0x3F | 0x80,
-	        codePoint & 0x3F | 0x80
-	      )
-	    } else if (codePoint < 0x110000) {
-	      if ((units -= 4) < 0) break
-	      bytes.push(
-	        codePoint >> 0x12 | 0xF0,
-	        codePoint >> 0xC & 0x3F | 0x80,
-	        codePoint >> 0x6 & 0x3F | 0x80,
-	        codePoint & 0x3F | 0x80
-	      )
-	    } else {
-	      throw new Error('Invalid code point')
-	    }
-	  }
-
-	  return bytes
-	}
-
-	function asciiToBytes (str) {
-	  var byteArray = []
-	  for (var i = 0; i < str.length; i++) {
-	    // Node's code seems to be doing this and not & 0x7F..
-	    byteArray.push(str.charCodeAt(i) & 0xFF)
-	  }
-	  return byteArray
-	}
-
-	function utf16leToBytes (str, units) {
-	  var c, hi, lo
-	  var byteArray = []
-	  for (var i = 0; i < str.length; i++) {
-	    if ((units -= 2) < 0) break
-
-	    c = str.charCodeAt(i)
-	    hi = c >> 8
-	    lo = c % 256
-	    byteArray.push(lo)
-	    byteArray.push(hi)
-	  }
-
-	  return byteArray
-	}
-
-	function base64ToBytes (str) {
-	  return base64.toByteArray(base64clean(str))
-	}
-
-	function blitBuffer (src, dst, offset, length) {
-	  for (var i = 0; i < length; i++) {
-	    if ((i + offset >= dst.length) || (i >= src.length)) break
-	    dst[i + offset] = src[i]
-	  }
-	  return i
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(34).Buffer, (function() { return this; }())))
-
-/***/ },
-/* 35 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
-
-	;(function (exports) {
-		'use strict';
-
-	  var Arr = (typeof Uint8Array !== 'undefined')
-	    ? Uint8Array
-	    : Array
-
-		var PLUS   = '+'.charCodeAt(0)
-		var SLASH  = '/'.charCodeAt(0)
-		var NUMBER = '0'.charCodeAt(0)
-		var LOWER  = 'a'.charCodeAt(0)
-		var UPPER  = 'A'.charCodeAt(0)
-		var PLUS_URL_SAFE = '-'.charCodeAt(0)
-		var SLASH_URL_SAFE = '_'.charCodeAt(0)
-
-		function decode (elt) {
-			var code = elt.charCodeAt(0)
-			if (code === PLUS ||
-			    code === PLUS_URL_SAFE)
-				return 62 // '+'
-			if (code === SLASH ||
-			    code === SLASH_URL_SAFE)
-				return 63 // '/'
-			if (code < NUMBER)
-				return -1 //no match
-			if (code < NUMBER + 10)
-				return code - NUMBER + 26 + 26
-			if (code < UPPER + 26)
-				return code - UPPER
-			if (code < LOWER + 26)
-				return code - LOWER + 26
-		}
-
-		function b64ToByteArray (b64) {
-			var i, j, l, tmp, placeHolders, arr
-
-			if (b64.length % 4 > 0) {
-				throw new Error('Invalid string. Length must be a multiple of 4')
-			}
-
-			// the number of equal signs (place holders)
-			// if there are two placeholders, than the two characters before it
-			// represent one byte
-			// if there is only one, then the three characters before it represent 2 bytes
-			// this is just a cheap hack to not do indexOf twice
-			var len = b64.length
-			placeHolders = '=' === b64.charAt(len - 2) ? 2 : '=' === b64.charAt(len - 1) ? 1 : 0
-
-			// base64 is 4/3 + up to two characters of the original data
-			arr = new Arr(b64.length * 3 / 4 - placeHolders)
-
-			// if there are placeholders, only get up to the last complete 4 chars
-			l = placeHolders > 0 ? b64.length - 4 : b64.length
-
-			var L = 0
-
-			function push (v) {
-				arr[L++] = v
-			}
-
-			for (i = 0, j = 0; i < l; i += 4, j += 3) {
-				tmp = (decode(b64.charAt(i)) << 18) | (decode(b64.charAt(i + 1)) << 12) | (decode(b64.charAt(i + 2)) << 6) | decode(b64.charAt(i + 3))
-				push((tmp & 0xFF0000) >> 16)
-				push((tmp & 0xFF00) >> 8)
-				push(tmp & 0xFF)
-			}
-
-			if (placeHolders === 2) {
-				tmp = (decode(b64.charAt(i)) << 2) | (decode(b64.charAt(i + 1)) >> 4)
-				push(tmp & 0xFF)
-			} else if (placeHolders === 1) {
-				tmp = (decode(b64.charAt(i)) << 10) | (decode(b64.charAt(i + 1)) << 4) | (decode(b64.charAt(i + 2)) >> 2)
-				push((tmp >> 8) & 0xFF)
-				push(tmp & 0xFF)
-			}
-
-			return arr
-		}
-
-		function uint8ToBase64 (uint8) {
-			var i,
-				extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
-				output = "",
-				temp, length
-
-			function encode (num) {
-				return lookup.charAt(num)
-			}
-
-			function tripletToBase64 (num) {
-				return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
-			}
-
-			// go through the array every three bytes, we'll deal with trailing stuff later
-			for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
-				temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
-				output += tripletToBase64(temp)
-			}
-
-			// pad the end with zeros, but make sure to not forget the extra bytes
-			switch (extraBytes) {
-				case 1:
-					temp = uint8[uint8.length - 1]
-					output += encode(temp >> 2)
-					output += encode((temp << 4) & 0x3F)
-					output += '=='
-					break
-				case 2:
-					temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
-					output += encode(temp >> 10)
-					output += encode((temp >> 4) & 0x3F)
-					output += encode((temp << 2) & 0x3F)
-					output += '='
-					break
-			}
-
-			return output
-		}
-
-		exports.toByteArray = b64ToByteArray
-		exports.fromByteArray = uint8ToBase64
-	}( false ? (this.base64js = {}) : exports))
-
-
-/***/ },
-/* 36 */
-/***/ function(module, exports) {
-
-	exports.read = function (buffer, offset, isLE, mLen, nBytes) {
-	  var e, m
-	  var eLen = nBytes * 8 - mLen - 1
-	  var eMax = (1 << eLen) - 1
-	  var eBias = eMax >> 1
-	  var nBits = -7
-	  var i = isLE ? (nBytes - 1) : 0
-	  var d = isLE ? -1 : 1
-	  var s = buffer[offset + i]
-
-	  i += d
-
-	  e = s & ((1 << (-nBits)) - 1)
-	  s >>= (-nBits)
-	  nBits += eLen
-	  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
-
-	  m = e & ((1 << (-nBits)) - 1)
-	  e >>= (-nBits)
-	  nBits += mLen
-	  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
-
-	  if (e === 0) {
-	    e = 1 - eBias
-	  } else if (e === eMax) {
-	    return m ? NaN : ((s ? -1 : 1) * Infinity)
-	  } else {
-	    m = m + Math.pow(2, mLen)
-	    e = e - eBias
-	  }
-	  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
-	}
-
-	exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
-	  var e, m, c
-	  var eLen = nBytes * 8 - mLen - 1
-	  var eMax = (1 << eLen) - 1
-	  var eBias = eMax >> 1
-	  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
-	  var i = isLE ? 0 : (nBytes - 1)
-	  var d = isLE ? 1 : -1
-	  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
-
-	  value = Math.abs(value)
-
-	  if (isNaN(value) || value === Infinity) {
-	    m = isNaN(value) ? 1 : 0
-	    e = eMax
-	  } else {
-	    e = Math.floor(Math.log(value) / Math.LN2)
-	    if (value * (c = Math.pow(2, -e)) < 1) {
-	      e--
-	      c *= 2
-	    }
-	    if (e + eBias >= 1) {
-	      value += rt / c
-	    } else {
-	      value += rt * Math.pow(2, 1 - eBias)
-	    }
-	    if (value * c >= 2) {
-	      e++
-	      c /= 2
-	    }
-
-	    if (e + eBias >= eMax) {
-	      m = 0
-	      e = eMax
-	    } else if (e + eBias >= 1) {
-	      m = (value * c - 1) * Math.pow(2, mLen)
-	      e = e + eBias
-	    } else {
-	      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
-	      e = 0
-	    }
-	  }
-
-	  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
-
-	  e = (e << mLen) | m
-	  eLen += mLen
-	  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
-
-	  buffer[offset + i - d] |= s * 128
-	}
-
-
-/***/ },
-/* 37 */
-/***/ function(module, exports) {
-
-	var toString = {}.toString;
-
-	module.exports = Array.isArray || function (arr) {
-	  return toString.call(arr) == '[object Array]';
-	};
-
-
-/***/ },
-/* 38 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(Buffer) {// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	// NOTE: These type checking functions intentionally don't use `instanceof`
-	// because it is fragile and can be easily faked with `Object.create()`.
-
-	function isArray(arg) {
-	  if (Array.isArray) {
-	    return Array.isArray(arg);
-	  }
-	  return objectToString(arg) === '[object Array]';
-	}
-	exports.isArray = isArray;
-
-	function isBoolean(arg) {
-	  return typeof arg === 'boolean';
-	}
-	exports.isBoolean = isBoolean;
-
-	function isNull(arg) {
-	  return arg === null;
-	}
-	exports.isNull = isNull;
-
-	function isNullOrUndefined(arg) {
-	  return arg == null;
-	}
-	exports.isNullOrUndefined = isNullOrUndefined;
-
-	function isNumber(arg) {
-	  return typeof arg === 'number';
-	}
-	exports.isNumber = isNumber;
-
-	function isString(arg) {
-	  return typeof arg === 'string';
-	}
-	exports.isString = isString;
-
-	function isSymbol(arg) {
-	  return typeof arg === 'symbol';
-	}
-	exports.isSymbol = isSymbol;
-
-	function isUndefined(arg) {
-	  return arg === void 0;
-	}
-	exports.isUndefined = isUndefined;
-
-	function isRegExp(re) {
-	  return objectToString(re) === '[object RegExp]';
-	}
-	exports.isRegExp = isRegExp;
-
-	function isObject(arg) {
-	  return typeof arg === 'object' && arg !== null;
-	}
-	exports.isObject = isObject;
-
-	function isDate(d) {
-	  return objectToString(d) === '[object Date]';
-	}
-	exports.isDate = isDate;
-
-	function isError(e) {
-	  return (objectToString(e) === '[object Error]' || e instanceof Error);
-	}
-	exports.isError = isError;
-
-	function isFunction(arg) {
-	  return typeof arg === 'function';
-	}
-	exports.isFunction = isFunction;
-
-	function isPrimitive(arg) {
-	  return arg === null ||
-	         typeof arg === 'boolean' ||
-	         typeof arg === 'number' ||
-	         typeof arg === 'string' ||
-	         typeof arg === 'symbol' ||  // ES6 symbol
-	         typeof arg === 'undefined';
-	}
-	exports.isPrimitive = isPrimitive;
-
-	exports.isBuffer = Buffer.isBuffer;
-
-	function objectToString(o) {
-	  return Object.prototype.toString.call(o);
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(34).Buffer))
-
-/***/ },
-/* 39 */
-/***/ function(module, exports) {
-
-	if (typeof Object.create === 'function') {
-	  // implementation from standard node.js 'util' module
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    ctor.prototype = Object.create(superCtor.prototype, {
-	      constructor: {
-	        value: ctor,
-	        enumerable: false,
-	        writable: true,
-	        configurable: true
-	      }
-	    });
-	  };
-	} else {
-	  // old school shim for old browsers
-	  module.exports = function inherits(ctor, superCtor) {
-	    ctor.super_ = superCtor
-	    var TempCtor = function () {}
-	    TempCtor.prototype = superCtor.prototype
-	    ctor.prototype = new TempCtor()
-	    ctor.prototype.constructor = ctor
-	  }
-	}
-
-
-/***/ },
-/* 40 */
-/***/ function(module, exports) {
-
-	/* (ignored) */
-
-/***/ },
-/* 41 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(process) {// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	// a duplex stream is just a stream that is both readable and writable.
-	// Since JS doesn't have multiple prototypal inheritance, this class
-	// prototypally inherits from Readable, and then parasitically from
-	// Writable.
-
-	module.exports = Duplex;
-
-	/*<replacement>*/
-	var objectKeys = Object.keys || function (obj) {
-	  var keys = [];
-	  for (var key in obj) keys.push(key);
-	  return keys;
-	}
-	/*</replacement>*/
-
-
-	/*<replacement>*/
-	var util = __webpack_require__(38);
-	util.inherits = __webpack_require__(39);
-	/*</replacement>*/
-
-	var Readable = __webpack_require__(32);
-	var Writable = __webpack_require__(42);
-
-	util.inherits(Duplex, Readable);
-
-	forEach(objectKeys(Writable.prototype), function(method) {
-	  if (!Duplex.prototype[method])
-	    Duplex.prototype[method] = Writable.prototype[method];
-	});
-
-	function Duplex(options) {
-	  if (!(this instanceof Duplex))
-	    return new Duplex(options);
-
-	  Readable.call(this, options);
-	  Writable.call(this, options);
-
-	  if (options && options.readable === false)
-	    this.readable = false;
-
-	  if (options && options.writable === false)
-	    this.writable = false;
-
-	  this.allowHalfOpen = true;
-	  if (options && options.allowHalfOpen === false)
-	    this.allowHalfOpen = false;
-
-	  this.once('end', onend);
-	}
-
-	// the no-half-open enforcer
-	function onend() {
-	  // if we allow half-open state, or if the writable side ended,
-	  // then we're ok.
-	  if (this.allowHalfOpen || this._writableState.ended)
-	    return;
-
-	  // no more data can be written.
-	  // But allow more writes to happen in this tick.
-	  process.nextTick(this.end.bind(this));
-	}
-
-	function forEach (xs, f) {
-	  for (var i = 0, l = xs.length; i < l; i++) {
-	    f(xs[i], i);
-	  }
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
-
-/***/ },
-/* 42 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(process) {// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	// A bit simpler than readable streams.
-	// Implement an async ._write(chunk, cb), and it'll handle all
-	// the drain event emission and buffering.
-
-	module.exports = Writable;
-
-	/*<replacement>*/
-	var Buffer = __webpack_require__(34).Buffer;
-	/*</replacement>*/
-
-	Writable.WritableState = WritableState;
-
-
-	/*<replacement>*/
-	var util = __webpack_require__(38);
-	util.inherits = __webpack_require__(39);
-	/*</replacement>*/
-
-	var Stream = __webpack_require__(29);
-
-	util.inherits(Writable, Stream);
-
-	function WriteReq(chunk, encoding, cb) {
-	  this.chunk = chunk;
-	  this.encoding = encoding;
-	  this.callback = cb;
-	}
-
-	function WritableState(options, stream) {
-	  var Duplex = __webpack_require__(41);
-
-	  options = options || {};
-
-	  // the point at which write() starts returning false
-	  // Note: 0 is a valid value, means that we always return false if
-	  // the entire buffer is not flushed immediately on write()
-	  var hwm = options.highWaterMark;
-	  var defaultHwm = options.objectMode ? 16 : 16 * 1024;
-	  this.highWaterMark = (hwm || hwm === 0) ? hwm : defaultHwm;
-
-	  // object stream flag to indicate whether or not this stream
-	  // contains buffers or objects.
-	  this.objectMode = !!options.objectMode;
-
-	  if (stream instanceof Duplex)
-	    this.objectMode = this.objectMode || !!options.writableObjectMode;
-
-	  // cast to ints.
-	  this.highWaterMark = ~~this.highWaterMark;
-
-	  this.needDrain = false;
-	  // at the start of calling end()
-	  this.ending = false;
-	  // when end() has been called, and returned
-	  this.ended = false;
-	  // when 'finish' is emitted
-	  this.finished = false;
-
-	  // should we decode strings into buffers before passing to _write?
-	  // this is here so that some node-core streams can optimize string
-	  // handling at a lower level.
-	  var noDecode = options.decodeStrings === false;
-	  this.decodeStrings = !noDecode;
-
-	  // Crypto is kind of old and crusty.  Historically, its default string
-	  // encoding is 'binary' so we have to make this configurable.
-	  // Everything else in the universe uses 'utf8', though.
-	  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-	  // not an actual buffer we keep track of, but a measurement
-	  // of how much we're waiting to get pushed to some underlying
-	  // socket or file.
-	  this.length = 0;
-
-	  // a flag to see when we're in the middle of a write.
-	  this.writing = false;
-
-	  // when true all writes will be buffered until .uncork() call
-	  this.corked = 0;
-
-	  // a flag to be able to tell if the onwrite cb is called immediately,
-	  // or on a later tick.  We set this to true at first, because any
-	  // actions that shouldn't happen until "later" should generally also
-	  // not happen before the first write call.
-	  this.sync = true;
-
-	  // a flag to know if we're processing previously buffered items, which
-	  // may call the _write() callback in the same tick, so that we don't
-	  // end up in an overlapped onwrite situation.
-	  this.bufferProcessing = false;
-
-	  // the callback that's passed to _write(chunk,cb)
-	  this.onwrite = function(er) {
-	    onwrite(stream, er);
-	  };
-
-	  // the callback that the user supplies to write(chunk,encoding,cb)
-	  this.writecb = null;
-
-	  // the amount that is being written when _write is called.
-	  this.writelen = 0;
-
-	  this.buffer = [];
-
-	  // number of pending user-supplied write callbacks
-	  // this must be 0 before 'finish' can be emitted
-	  this.pendingcb = 0;
-
-	  // emit prefinish if the only thing we're waiting for is _write cbs
-	  // This is relevant for synchronous Transform streams
-	  this.prefinished = false;
-
-	  // True if the error was already emitted and should not be thrown again
-	  this.errorEmitted = false;
-	}
-
-	function Writable(options) {
-	  var Duplex = __webpack_require__(41);
-
-	  // Writable ctor is applied to Duplexes, though they're not
-	  // instanceof Writable, they're instanceof Readable.
-	  if (!(this instanceof Writable) && !(this instanceof Duplex))
-	    return new Writable(options);
-
-	  this._writableState = new WritableState(options, this);
-
-	  // legacy.
-	  this.writable = true;
-
-	  Stream.call(this);
-	}
-
-	// Otherwise people can pipe Writable streams, which is just wrong.
-	Writable.prototype.pipe = function() {
-	  this.emit('error', new Error('Cannot pipe. Not readable.'));
-	};
-
-
-	function writeAfterEnd(stream, state, cb) {
-	  var er = new Error('write after end');
-	  // TODO: defer error events consistently everywhere, not just the cb
-	  stream.emit('error', er);
-	  process.nextTick(function() {
-	    cb(er);
-	  });
-	}
-
-	// If we get something that is not a buffer, string, null, or undefined,
-	// and we're not in objectMode, then that's an error.
-	// Otherwise stream chunks are all considered to be of length=1, and the
-	// watermarks determine how many objects to keep in the buffer, rather than
-	// how many bytes or characters.
-	function validChunk(stream, state, chunk, cb) {
-	  var valid = true;
-	  if (!util.isBuffer(chunk) &&
-	      !util.isString(chunk) &&
-	      !util.isNullOrUndefined(chunk) &&
-	      !state.objectMode) {
-	    var er = new TypeError('Invalid non-string/buffer chunk');
-	    stream.emit('error', er);
-	    process.nextTick(function() {
-	      cb(er);
-	    });
-	    valid = false;
-	  }
-	  return valid;
-	}
-
-	Writable.prototype.write = function(chunk, encoding, cb) {
-	  var state = this._writableState;
-	  var ret = false;
-
-	  if (util.isFunction(encoding)) {
-	    cb = encoding;
-	    encoding = null;
-	  }
-
-	  if (util.isBuffer(chunk))
-	    encoding = 'buffer';
-	  else if (!encoding)
-	    encoding = state.defaultEncoding;
-
-	  if (!util.isFunction(cb))
-	    cb = function() {};
-
-	  if (state.ended)
-	    writeAfterEnd(this, state, cb);
-	  else if (validChunk(this, state, chunk, cb)) {
-	    state.pendingcb++;
-	    ret = writeOrBuffer(this, state, chunk, encoding, cb);
-	  }
-
-	  return ret;
-	};
-
-	Writable.prototype.cork = function() {
-	  var state = this._writableState;
-
-	  state.corked++;
-	};
-
-	Writable.prototype.uncork = function() {
-	  var state = this._writableState;
-
-	  if (state.corked) {
-	    state.corked--;
-
-	    if (!state.writing &&
-	        !state.corked &&
-	        !state.finished &&
-	        !state.bufferProcessing &&
-	        state.buffer.length)
-	      clearBuffer(this, state);
-	  }
-	};
-
-	function decodeChunk(state, chunk, encoding) {
-	  if (!state.objectMode &&
-	      state.decodeStrings !== false &&
-	      util.isString(chunk)) {
-	    chunk = new Buffer(chunk, encoding);
-	  }
-	  return chunk;
-	}
-
-	// if we're already writing something, then just put this
-	// in the queue, and wait our turn.  Otherwise, call _write
-	// If we return false, then we need a drain event, so set that flag.
-	function writeOrBuffer(stream, state, chunk, encoding, cb) {
-	  chunk = decodeChunk(state, chunk, encoding);
-	  if (util.isBuffer(chunk))
-	    encoding = 'buffer';
-	  var len = state.objectMode ? 1 : chunk.length;
-
-	  state.length += len;
-
-	  var ret = state.length < state.highWaterMark;
-	  // we must ensure that previous needDrain will not be reset to false.
-	  if (!ret)
-	    state.needDrain = true;
-
-	  if (state.writing || state.corked)
-	    state.buffer.push(new WriteReq(chunk, encoding, cb));
-	  else
-	    doWrite(stream, state, false, len, chunk, encoding, cb);
-
-	  return ret;
-	}
-
-	function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-	  state.writelen = len;
-	  state.writecb = cb;
-	  state.writing = true;
-	  state.sync = true;
-	  if (writev)
-	    stream._writev(chunk, state.onwrite);
-	  else
-	    stream._write(chunk, encoding, state.onwrite);
-	  state.sync = false;
-	}
-
-	function onwriteError(stream, state, sync, er, cb) {
-	  if (sync)
-	    process.nextTick(function() {
-	      state.pendingcb--;
-	      cb(er);
-	    });
-	  else {
-	    state.pendingcb--;
-	    cb(er);
-	  }
-
-	  stream._writableState.errorEmitted = true;
-	  stream.emit('error', er);
-	}
-
-	function onwriteStateUpdate(state) {
-	  state.writing = false;
-	  state.writecb = null;
-	  state.length -= state.writelen;
-	  state.writelen = 0;
-	}
-
-	function onwrite(stream, er) {
-	  var state = stream._writableState;
-	  var sync = state.sync;
-	  var cb = state.writecb;
-
-	  onwriteStateUpdate(state);
-
-	  if (er)
-	    onwriteError(stream, state, sync, er, cb);
-	  else {
-	    // Check if we're actually ready to finish, but don't emit yet
-	    var finished = needFinish(stream, state);
-
-	    if (!finished &&
-	        !state.corked &&
-	        !state.bufferProcessing &&
-	        state.buffer.length) {
-	      clearBuffer(stream, state);
-	    }
-
-	    if (sync) {
-	      process.nextTick(function() {
-	        afterWrite(stream, state, finished, cb);
-	      });
-	    } else {
-	      afterWrite(stream, state, finished, cb);
-	    }
-	  }
-	}
-
-	function afterWrite(stream, state, finished, cb) {
-	  if (!finished)
-	    onwriteDrain(stream, state);
-	  state.pendingcb--;
-	  cb();
-	  finishMaybe(stream, state);
-	}
-
-	// Must force callback to be called on nextTick, so that we don't
-	// emit 'drain' before the write() consumer gets the 'false' return
-	// value, and has a chance to attach a 'drain' listener.
-	function onwriteDrain(stream, state) {
-	  if (state.length === 0 && state.needDrain) {
-	    state.needDrain = false;
-	    stream.emit('drain');
-	  }
-	}
-
-
-	// if there's something in the buffer waiting, then process it
-	function clearBuffer(stream, state) {
-	  state.bufferProcessing = true;
-
-	  if (stream._writev && state.buffer.length > 1) {
-	    // Fast case, write everything using _writev()
-	    var cbs = [];
-	    for (var c = 0; c < state.buffer.length; c++)
-	      cbs.push(state.buffer[c].callback);
-
-	    // count the one we are adding, as well.
-	    // TODO(isaacs) clean this up
-	    state.pendingcb++;
-	    doWrite(stream, state, true, state.length, state.buffer, '', function(err) {
-	      for (var i = 0; i < cbs.length; i++) {
-	        state.pendingcb--;
-	        cbs[i](err);
-	      }
-	    });
-
-	    // Clear buffer
-	    state.buffer = [];
-	  } else {
-	    // Slow case, write chunks one-by-one
-	    for (var c = 0; c < state.buffer.length; c++) {
-	      var entry = state.buffer[c];
-	      var chunk = entry.chunk;
-	      var encoding = entry.encoding;
-	      var cb = entry.callback;
-	      var len = state.objectMode ? 1 : chunk.length;
-
-	      doWrite(stream, state, false, len, chunk, encoding, cb);
-
-	      // if we didn't call the onwrite immediately, then
-	      // it means that we need to wait until it does.
-	      // also, that means that the chunk and cb are currently
-	      // being processed, so move the buffer counter past them.
-	      if (state.writing) {
-	        c++;
-	        break;
-	      }
-	    }
-
-	    if (c < state.buffer.length)
-	      state.buffer = state.buffer.slice(c);
-	    else
-	      state.buffer.length = 0;
-	  }
-
-	  state.bufferProcessing = false;
-	}
-
-	Writable.prototype._write = function(chunk, encoding, cb) {
-	  cb(new Error('not implemented'));
-
-	};
-
-	Writable.prototype._writev = null;
-
-	Writable.prototype.end = function(chunk, encoding, cb) {
-	  var state = this._writableState;
-
-	  if (util.isFunction(chunk)) {
-	    cb = chunk;
-	    chunk = null;
-	    encoding = null;
-	  } else if (util.isFunction(encoding)) {
-	    cb = encoding;
-	    encoding = null;
-	  }
-
-	  if (!util.isNullOrUndefined(chunk))
-	    this.write(chunk, encoding);
-
-	  // .end() fully uncorks
-	  if (state.corked) {
-	    state.corked = 1;
-	    this.uncork();
-	  }
-
-	  // ignore unnecessary end() calls.
-	  if (!state.ending && !state.finished)
-	    endWritable(this, state, cb);
-	};
-
-
-	function needFinish(stream, state) {
-	  return (state.ending &&
-	          state.length === 0 &&
-	          !state.finished &&
-	          !state.writing);
-	}
-
-	function prefinish(stream, state) {
-	  if (!state.prefinished) {
-	    state.prefinished = true;
-	    stream.emit('prefinish');
-	  }
-	}
-
-	function finishMaybe(stream, state) {
-	  var need = needFinish(stream, state);
-	  if (need) {
-	    if (state.pendingcb === 0) {
-	      prefinish(stream, state);
-	      state.finished = true;
-	      stream.emit('finish');
-	    } else
-	      prefinish(stream, state);
-	  }
-	  return need;
-	}
-
-	function endWritable(stream, state, cb) {
-	  state.ending = true;
-	  finishMaybe(stream, state);
-	  if (cb) {
-	    if (state.finished)
-	      process.nextTick(cb);
-	    else
-	      stream.once('finish', cb);
-	  }
-	  state.ended = true;
-	}
-
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)))
-
-/***/ },
-/* 43 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	var Buffer = __webpack_require__(34).Buffer;
-
-	var isBufferEncoding = Buffer.isEncoding
-	  || function(encoding) {
-	       switch (encoding && encoding.toLowerCase()) {
-	         case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;
-	         default: return false;
-	       }
-	     }
-
-
-	function assertEncoding(encoding) {
-	  if (encoding && !isBufferEncoding(encoding)) {
-	    throw new Error('Unknown encoding: ' + encoding);
-	  }
-	}
-
-	// StringDecoder provides an interface for efficiently splitting a series of
-	// buffers into a series of JS strings without breaking apart multi-byte
-	// characters. CESU-8 is handled as part of the UTF-8 encoding.
-	//
-	// @TODO Handling all encodings inside a single object makes it very difficult
-	// to reason about this code, so it should be split up in the future.
-	// @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code
-	// points as used by CESU-8.
-	var StringDecoder = exports.StringDecoder = function(encoding) {
-	  this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
-	  assertEncoding(encoding);
-	  switch (this.encoding) {
-	    case 'utf8':
-	      // CESU-8 represents each of Surrogate Pair by 3-bytes
-	      this.surrogateSize = 3;
-	      break;
-	    case 'ucs2':
-	    case 'utf16le':
-	      // UTF-16 represents each of Surrogate Pair by 2-bytes
-	      this.surrogateSize = 2;
-	      this.detectIncompleteChar = utf16DetectIncompleteChar;
-	      break;
-	    case 'base64':
-	      // Base-64 stores 3 bytes in 4 chars, and pads the remainder.
-	      this.surrogateSize = 3;
-	      this.detectIncompleteChar = base64DetectIncompleteChar;
-	      break;
-	    default:
-	      this.write = passThroughWrite;
-	      return;
-	  }
-
-	  // Enough space to store all bytes of a single character. UTF-8 needs 4
-	  // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).
-	  this.charBuffer = new Buffer(6);
-	  // Number of bytes received for the current incomplete multi-byte character.
-	  this.charReceived = 0;
-	  // Number of bytes expected for the current incomplete multi-byte character.
-	  this.charLength = 0;
-	};
-
-
-	// write decodes the given buffer and returns it as JS string that is
-	// guaranteed to not contain any partial multi-byte characters. Any partial
-	// character found at the end of the buffer is buffered up, and will be
-	// returned when calling write again with the remaining bytes.
-	//
-	// Note: Converting a Buffer containing an orphan surrogate to a String
-	// currently works, but converting a String to a Buffer (via `new Buffer`, or
-	// Buffer#write) will replace incomplete surrogates with the unicode
-	// replacement character. See https://codereview.chromium.org/121173009/ .
-	StringDecoder.prototype.write = function(buffer) {
-	  var charStr = '';
-	  // if our last write ended with an incomplete multibyte character
-	  while (this.charLength) {
-	    // determine how many remaining bytes this buffer has to offer for this char
-	    var available = (buffer.length >= this.charLength - this.charReceived) ?
-	        this.charLength - this.charReceived :
-	        buffer.length;
-
-	    // add the new bytes to the char buffer
-	    buffer.copy(this.charBuffer, this.charReceived, 0, available);
-	    this.charReceived += available;
-
-	    if (this.charReceived < this.charLength) {
-	      // still not enough chars in this buffer? wait for more ...
-	      return '';
-	    }
-
-	    // remove bytes belonging to the current character from the buffer
-	    buffer = buffer.slice(available, buffer.length);
-
-	    // get the character that was split
-	    charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);
-
-	    // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
-	    var charCode = charStr.charCodeAt(charStr.length - 1);
-	    if (charCode >= 0xD800 && charCode <= 0xDBFF) {
-	      this.charLength += this.surrogateSize;
-	      charStr = '';
-	      continue;
-	    }
-	    this.charReceived = this.charLength = 0;
-
-	    // if there are no more bytes in this buffer, just emit our char
-	    if (buffer.length === 0) {
-	      return charStr;
-	    }
-	    break;
-	  }
-
-	  // determine and set charLength / charReceived
-	  this.detectIncompleteChar(buffer);
-
-	  var end = buffer.length;
-	  if (this.charLength) {
-	    // buffer the incomplete character bytes we got
-	    buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);
-	    end -= this.charReceived;
-	  }
-
-	  charStr += buffer.toString(this.encoding, 0, end);
-
-	  var end = charStr.length - 1;
-	  var charCode = charStr.charCodeAt(end);
-	  // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
-	  if (charCode >= 0xD800 && charCode <= 0xDBFF) {
-	    var size = this.surrogateSize;
-	    this.charLength += size;
-	    this.charReceived += size;
-	    this.charBuffer.copy(this.charBuffer, size, 0, size);
-	    buffer.copy(this.charBuffer, 0, 0, size);
-	    return charStr.substring(0, end);
-	  }
-
-	  // or just emit the charStr
-	  return charStr;
-	};
-
-	// detectIncompleteChar determines if there is an incomplete UTF-8 character at
-	// the end of the given buffer. If so, it sets this.charLength to the byte
-	// length that character, and sets this.charReceived to the number of bytes
-	// that are available for this character.
-	StringDecoder.prototype.detectIncompleteChar = function(buffer) {
-	  // determine how many bytes we have to check at the end of this buffer
-	  var i = (buffer.length >= 3) ? 3 : buffer.length;
-
-	  // Figure out if one of the last i bytes of our buffer announces an
-	  // incomplete char.
-	  for (; i > 0; i--) {
-	    var c = buffer[buffer.length - i];
-
-	    // See http://en.wikipedia.org/wiki/UTF-8#Description
-
-	    // 110XXXXX
-	    if (i == 1 && c >> 5 == 0x06) {
-	      this.charLength = 2;
-	      break;
-	    }
-
-	    // 1110XXXX
-	    if (i <= 2 && c >> 4 == 0x0E) {
-	      this.charLength = 3;
-	      break;
-	    }
-
-	    // 11110XXX
-	    if (i <= 3 && c >> 3 == 0x1E) {
-	      this.charLength = 4;
-	      break;
-	    }
-	  }
-	  this.charReceived = i;
-	};
-
-	StringDecoder.prototype.end = function(buffer) {
-	  var res = '';
-	  if (buffer && buffer.length)
-	    res = this.write(buffer);
-
-	  if (this.charReceived) {
-	    var cr = this.charReceived;
-	    var buf = this.charBuffer;
-	    var enc = this.encoding;
-	    res += buf.slice(0, cr).toString(enc);
-	  }
-
-	  return res;
-	};
-
-	function passThroughWrite(buffer) {
-	  return buffer.toString(this.encoding);
-	}
-
-	function utf16DetectIncompleteChar(buffer) {
-	  this.charReceived = buffer.length % 2;
-	  this.charLength = this.charReceived ? 2 : 0;
-	}
-
-	function base64DetectIncompleteChar(buffer) {
-	  this.charReceived = buffer.length % 3;
-	  this.charLength = this.charReceived ? 3 : 0;
-	}
-
-
-/***/ },
-/* 44 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
-	// a transform stream is a readable/writable stream where you do
-	// something with the data.  Sometimes it's called a "filter",
-	// but that's not a great name for it, since that implies a thing where
-	// some bits pass through, and others are simply ignored.  (That would
-	// be a valid example of a transform, of course.)
-	//
-	// While the output is causally related to the input, it's not a
-	// necessarily symmetric or synchronous transformation.  For example,
-	// a zlib stream might take multiple plain-text writes(), and then
-	// emit a single compressed chunk some time in the future.
-	//
-	// Here's how this works:
-	//
-	// The Transform stream has all the aspects of the readable and writable
-	// stream classes.  When you write(chunk), that calls _write(chunk,cb)
-	// internally, and returns false if there's a lot of pending writes
-	// buffered up.  When you call read(), that calls _read(n) until
-	// there's enough pending readable data buffered up.
-	//
-	// In a transform stream, the written data is placed in a buffer.  When
-	// _read(n) is called, it transforms the queued up data, calling the
-	// buffered _write cb's as it consumes chunks.  If consuming a single
-	// written chunk would result in multiple output chunks, then the first
-	// outputted bit calls the readcb, and subsequent chunks just go into
-	// the read buffer, and will cause it to emit 'readable' if necessary.
-	//
-	// This way, back-pressure is actually determined by the reading side,
-	// since _read has to be called to start processing a new chunk.  However,
-	// a pathological inflate type of transform can cause excessive buffering
-	// here.  For example, imagine a stream where every byte of input is
-	// interpreted as an integer from 0-255, and then results in that many
-	// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
-	// 1kb of data being output.  In this case, you could write a very small
-	// amount of input, and end up with a very large amount of output.  In
-	// such a pathological inflating mechanism, there'd be no way to tell
-	// the system to stop doing the transform.  A single 4MB write could
-	// cause the system to run out of memory.
-	//
-	// However, even in such a pathological case, only a single written chunk
-	// would be consumed, and then the rest would wait (un-transformed) until
-	// the results of the previous transformed chunk were consumed.
-
-	module.exports = Transform;
-
-	var Duplex = __webpack_require__(41);
-
-	/*<replacement>*/
-	var util = __webpack_require__(38);
-	util.inherits = __webpack_require__(39);
-	/*</replacement>*/
-
-	util.inherits(Transform, Duplex);
-
-
-	function TransformState(options, stream) {
-	  this.afterTransform = function(er, data) {
-	    return afterTransform(stream, er, data);
-	  };
-
-	  this.needTransform = false;
-	  this.transforming = false;
-	  this.writecb = null;
-	  this.writechunk = null;
-	}
-
-	function afterTransform(stream, er, data) {
-	  var ts = stream._transformState;
-	  ts.transforming = false;
-
-	  var cb = ts.writecb;
-
-	  if (!cb)
-	    return stream.emit('error', new Error('no writecb in Transform class'));
-
-	  ts.writechunk = null;
-	  ts.writecb = null;
-
-	  if (!util.isNullOrUndefined(data))
-	    stream.push(data);
-
-	  if (cb)
-	    cb(er);
-
-	  var rs = stream._readableState;
-	  rs.reading = false;
-	  if (rs.needReadable || rs.length < rs.highWaterMark) {
-	    stream._read(rs.highWaterMark);
-	  }
-	}
-
-
-	function Transform(options) {
-	  if (!(this instanceof Transform))
-	    return new Transform(options);
-
-	  Duplex.call(this, options);
-
-	  this._transformState = new TransformState(options, this);
-
-	  // when the writable side finishes, then flush out anything remaining.
-	  var stream = this;
-
-	  // start out asking for a readable event once data is transformed.
-	  this._readableState.needReadable = true;
-
-	  // we have implemented the _read method, and done the other things
-	  // that Readable wants before the first _read call, so unset the
-	  // sync guard flag.
-	  this._readableState.sync = false;
-
-	  this.once('prefinish', function() {
-	    if (util.isFunction(this._flush))
-	      this._flush(function(er) {
-	        done(stream, er);
-	      });
-	    else
-	      done(stream);
-	  });
-	}
-
-	Transform.prototype.push = function(chunk, encoding) {
-	  this._transformState.needTransform = false;
-	  return Duplex.prototype.push.call(this, chunk, encoding);
-	};
-
-	// This is the part where you do stuff!
-	// override this function in implementation classes.
-	// 'chunk' is an input chunk.
-	//
-	// Call `push(newChunk)` to pass along transformed output
-	// to the readable side.  You may call 'push' zero or more times.
-	//
-	// Call `cb(err)` when you are done with this chunk.  If you pass
-	// an error, then that'll put the hurt on the whole operation.  If you
-	// never call cb(), then you'll never get another chunk.
-	Transform.prototype._transform = function(chunk, encoding, cb) {
-	  throw new Error('not implemented');
-	};
-
-	Transform.prototype._write = function(chunk, encoding, cb) {
-	  var ts = this._transformState;
-	  ts.writecb = cb;
-	  ts.writechunk = chunk;
-	  ts.writeencoding = encoding;
-	  if (!ts.transforming) {
-	    var rs = this._readableState;
-	    if (ts.needTransform ||
-	        rs.needReadable ||
-	        rs.length < rs.highWaterMark)
-	      this._read(rs.highWaterMark);
-	  }
-	};
-
-	// Doesn't matter what the args are here.
-	// _transform does all the work.
-	// That we got here means that the readable side wants more data.
-	Transform.prototype._read = function(n) {
-	  var ts = this._transformState;
-
-	  if (!util.isNull(ts.writechunk) && ts.writecb && !ts.transforming) {
-	    ts.transforming = true;
-	    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-	  } else {
-	    // mark that we need a transform, so that any data that comes in
-	    // will get processed, now that we've asked for it.
-	    ts.needTransform = true;
-	  }
-	};
-
-
-	function done(stream, er) {
-	  if (er)
-	    return stream.emit('error', er);
-
-	  // if there's nothing in the write buffer, then that means
-	  // that nothing more will ever be provided
-	  var ws = stream._writableState;
-	  var ts = stream._transformState;
-
-	  if (ws.length)
-	    throw new Error('calling transform done when ws.length != 0');
-
-	  if (ts.transforming)
-	    throw new Error('calling transform done when still transforming');
-
-	  return stream.push(null);
-	}
-
-
-/***/ },
-/* 45 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Copyright Joyent, Inc. and other Node contributors.
-	//
-	// Permission is hereby granted, free of charge, to any person obtaining a
-	// copy of this software and associated documentation files (the
-	// "Software"), to deal in the Software without restriction, including
-	// without limitation the rights to use, copy, modify, merge, publish,
-	// distribute, sublicense, and/or sell copies of the Software, and to permit
-	// persons to whom the Software is furnished to do so, subject to the
-	// following conditions:
-	//
-	// The above copyright notice and this permission notice shall be included
-	// in all copies or substantial portions of the Software.
-	//
-	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-	// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-	// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-	// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-	// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-	// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-	// a passthrough stream.
-	// basically just the most minimal sort of Transform stream.
-	// Every written chunk gets output as-is.
-
-	module.exports = PassThrough;
-
-	var Transform = __webpack_require__(44);
-
-	/*<replacement>*/
-	var util = __webpack_require__(38);
-	util.inherits = __webpack_require__(39);
-	/*</replacement>*/
-
-	util.inherits(PassThrough, Transform);
-
-	function PassThrough(options) {
-	  if (!(this instanceof PassThrough))
-	    return new PassThrough(options);
-
-	  Transform.call(this, options);
-	}
-
-	PassThrough.prototype._transform = function(chunk, encoding, cb) {
-	  cb(null, chunk);
-	};
-
-
-/***/ },
-/* 46 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = __webpack_require__(42)
-
-
-/***/ },
-/* 47 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = __webpack_require__(41)
-
-
-/***/ },
-/* 48 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = __webpack_require__(44)
-
-
-/***/ },
-/* 49 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = __webpack_require__(45)
-
-
-/***/ },
-/* 50 */
-/***/ function(module, exports) {
-
-	/* (ignored) */
-
-/***/ },
-/* 51 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = ProxyHandler;
-
-	function ProxyHandler(cbs){
-		this._cbs = cbs || {};
-	}
-
-	var EVENTS = __webpack_require__(14).EVENTS;
-	Object.keys(EVENTS).forEach(function(name){
-		if(EVENTS[name] === 0){
-			name = "on" + name;
-			ProxyHandler.prototype[name] = function(){
-				if(this._cbs[name]) this._cbs[name]();
-			};
-		} else if(EVENTS[name] === 1){
-			name = "on" + name;
-			ProxyHandler.prototype[name] = function(a){
-				if(this._cbs[name]) this._cbs[name](a);
-			};
-		} else if(EVENTS[name] === 2){
-			name = "on" + name;
-			ProxyHandler.prototype[name] = function(a, b){
-				if(this._cbs[name]) this._cbs[name](a, b);
-			};
-		} else {
-			throw Error("wrong number of arguments");
-		}
-	});
-
-/***/ },
-/* 52 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var DomUtils = module.exports;
-
-	[
-		__webpack_require__(53),
-		__webpack_require__(59),
-		__webpack_require__(60),
-		__webpack_require__(61),
-		__webpack_require__(62),
-		__webpack_require__(63)
-	].forEach(function(ext){
-		Object.keys(ext).forEach(function(key){
-			DomUtils[key] = ext[key].bind(DomUtils);
-		});
-	});
-
-
-/***/ },
-/* 53 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var ElementType = __webpack_require__(23),
-	    getOuterHTML = __webpack_require__(54),
-	    isTag = ElementType.isTag;
-
-	module.exports = {
-		getInnerHTML: getInnerHTML,
-		getOuterHTML: getOuterHTML,
-		getText: getText
-	};
-
-	function getInnerHTML(elem, opts){
-		return elem.children ? elem.children.map(function(elem){
-			return getOuterHTML(elem, opts);
-		}).join("") : "";
-	}
-
-	function getText(elem){
-		if(Array.isArray(elem)) return elem.map(getText).join("");
-		if(isTag(elem) || elem.type === ElementType.CDATA) return getText(elem.children);
-		if(elem.type === ElementType.Text) return elem.data;
-		return "";
-	}
-
-
-/***/ },
-/* 54 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/*
-	  Module dependencies
-	*/
-	var ElementType = __webpack_require__(55);
-	var entities = __webpack_require__(56);
-
-	/*
-	  Boolean Attributes
-	*/
-	var booleanAttributes = {
-	  __proto__: null,
-	  allowfullscreen: true,
-	  async: true,
-	  autofocus: true,
-	  autoplay: true,
-	  checked: true,
-	  controls: true,
-	  default: true,
-	  defer: true,
-	  disabled: true,
-	  hidden: true,
-	  ismap: true,
-	  loop: true,
-	  multiple: true,
-	  muted: true,
-	  open: true,
-	  readonly: true,
-	  required: true,
-	  reversed: true,
-	  scoped: true,
-	  seamless: true,
-	  selected: true,
-	  typemustmatch: true
-	};
-
-	var unencodedElements = {
-	  __proto__: null,
-	  style: true,
-	  script: true,
-	  xmp: true,
-	  iframe: true,
-	  noembed: true,
-	  noframes: true,
-	  plaintext: true,
-	  noscript: true
-	};
-
-	/*
-	  Format attributes
-	*/
-	function formatAttrs(attributes, opts) {
-	  if (!attributes) return;
-
-	  var output = '',
-	      value;
-
-	  // Loop through the attributes
-	  for (var key in attributes) {
-	    value = attributes[key];
-	    if (output) {
-	      output += ' ';
-	    }
-
-	    if (!value && booleanAttributes[key]) {
-	      output += key;
-	    } else {
-	      output += key + '="' + (opts.decodeEntities ? entities.encodeXML(value) : value) + '"';
-	    }
-	  }
-
-	  return output;
-	}
-
-	/*
-	  Self-enclosing tags (stolen from node-htmlparser)
-	*/
-	var singleTag = {
-	  __proto__: null,
-	  area: true,
-	  base: true,
-	  basefont: true,
-	  br: true,
-	  col: true,
-	  command: true,
-	  embed: true,
-	  frame: true,
-	  hr: true,
-	  img: true,
-	  input: true,
-	  isindex: true,
-	  keygen: true,
-	  link: true,
-	  meta: true,
-	  param: true,
-	  source: true,
-	  track: true,
-	  wbr: true,
-	};
-
-
-	var render = module.exports = function(dom, opts) {
-	  if (!Array.isArray(dom) && !dom.cheerio) dom = [dom];
-	  opts = opts || {};
-
-	  var output = '';
-
-	  for(var i = 0; i < dom.length; i++){
-	    var elem = dom[i];
-
-	    if (elem.type === 'root')
-	      output += render(elem.children, opts);
-	    else if (ElementType.isTag(elem))
-	      output += renderTag(elem, opts);
-	    else if (elem.type === ElementType.Directive)
-	      output += renderDirective(elem);
-	    else if (elem.type === ElementType.Comment)
-	      output += renderComment(elem);
-	    else if (elem.type === ElementType.CDATA)
-	      output += renderCdata(elem);
-	    else
-	      output += renderText(elem, opts);
-	  }
-
-	  return output;
-	};
-
-	function renderTag(elem, opts) {
-	  // Handle SVG
-	  if (elem.name === "svg") opts = {decodeEntities: opts.decodeEntities, xmlMode: true};
-
-	  var tag = '<' + elem.name,
-	      attribs = formatAttrs(elem.attribs, opts);
-
-	  if (attribs) {
-	    tag += ' ' + attribs;
-	  }
-
-	  if (
-	    opts.xmlMode
-	    && (!elem.children || elem.children.length === 0)
-	  ) {
-	    tag += '/>';
-	  } else {
-	    tag += '>';
-	    if (elem.children) {
-	      tag += render(elem.children, opts);
-	    }
-
-	    if (!singleTag[elem.name] || opts.xmlMode) {
-	      tag += '</' + elem.name + '>';
-	    }
-	  }
-
-	  return tag;
-	}
-
-	function renderDirective(elem) {
-	  return '<' + elem.data + '>';
-	}
-
-	function renderText(elem, opts) {
-	  var data = elem.data || '';
-
-	  // if entities weren't decoded, no need to encode them back
-	  if (opts.decodeEntities && !(elem.parent && elem.parent.name in unencodedElements)) {
-	    data = entities.encodeXML(data);
-	  }
-
-	  return data;
-	}
-
-	function renderCdata(elem) {
-	  return '<![CDATA[' + elem.children[0].data + ']]>';
-	}
-
-	function renderComment(elem) {
-	  return '<!--' + elem.data + '-->';
-	}
-
-
-/***/ },
-/* 55 */
-/***/ function(module, exports) {
-
-	//Types of elements found in the DOM
-	module.exports = {
-		Text: "text", //Text
-		Directive: "directive", //<? ... ?>
-		Comment: "comment", //<!-- ... -->
-		Script: "script", //<script> tags
-		Style: "style", //<style> tags
-		Tag: "tag", //Any tag
-		CDATA: "cdata", //<![CDATA[ ... ]]>
-
-		isTag: function(elem){
-			return elem.type === "tag" || elem.type === "script" || elem.type === "style";
-		}
-	};
-
-/***/ },
-/* 56 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var encode = __webpack_require__(57),
-	    decode = __webpack_require__(58);
-
-	exports.decode = function(data, level){
-		return (!level || level <= 0 ? decode.XML : decode.HTML)(data);
-	};
-
-	exports.decodeStrict = function(data, level){
-		return (!level || level <= 0 ? decode.XML : decode.HTMLStrict)(data);
-	};
-
-	exports.encode = function(data, level){
-		return (!level || level <= 0 ? encode.XML : encode.HTML)(data);
-	};
-
-	exports.encodeXML = encode.XML;
-
-	exports.encodeHTML4 =
-	exports.encodeHTML5 =
-	exports.encodeHTML  = encode.HTML;
-
-	exports.decodeXML =
-	exports.decodeXMLStrict = decode.XML;
-
-	exports.decodeHTML4 =
-	exports.decodeHTML5 =
-	exports.decodeHTML = decode.HTML;
-
-	exports.decodeHTML4Strict =
-	exports.decodeHTML5Strict =
-	exports.decodeHTMLStrict = decode.HTMLStrict;
-
-	exports.escape = encode.escape;
-
-
-/***/ },
-/* 57 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var inverseXML = getInverseObj(__webpack_require__(21)),
-	    xmlReplacer = getInverseReplacer(inverseXML);
-
-	exports.XML = getInverse(inverseXML, xmlReplacer);
-
-	var inverseHTML = getInverseObj(__webpack_require__(19)),
-	    htmlReplacer = getInverseReplacer(inverseHTML);
-
-	exports.HTML = getInverse(inverseHTML, htmlReplacer);
-
-	function getInverseObj(obj){
-		return Object.keys(obj).sort().reduce(function(inverse, name){
-			inverse[obj[name]] = "&" + name + ";";
-			return inverse;
-		}, {});
-	}
-
-	function getInverseReplacer(inverse){
-		var single = [],
-		    multiple = [];
-
-		Object.keys(inverse).forEach(function(k){
-			if(k.length === 1){
-				single.push("\\" + k);
-			} else {
-				multiple.push(k);
-			}
-		});
-
-		//TODO add ranges
-		multiple.unshift("[" + single.join("") + "]");
-
-		return new RegExp(multiple.join("|"), "g");
-	}
-
-	var re_nonASCII = /[^\0-\x7F]/g,
-	    re_astralSymbols = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
-
-	function singleCharReplacer(c){
-		return "&#x" + c.charCodeAt(0).toString(16).toUpperCase() + ";";
-	}
-
-	function astralReplacer(c){
-		// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
-		var high = c.charCodeAt(0);
-		var low  = c.charCodeAt(1);
-		var codePoint = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
-		return "&#x" + codePoint.toString(16).toUpperCase() + ";";
-	}
-
-	function getInverse(inverse, re){
-		function func(name){
-			return inverse[name];
-		}
-
-		return function(data){
-			return data
-					.replace(re, func)
-					.replace(re_astralSymbols, astralReplacer)
-					.replace(re_nonASCII, singleCharReplacer);
-		};
-	}
-
-	var re_xmlChars = getInverseReplacer(inverseXML);
-
-	function escapeXML(data){
-		return data
-				.replace(re_xmlChars, singleCharReplacer)
-				.replace(re_astralSymbols, astralReplacer)
-				.replace(re_nonASCII, singleCharReplacer);
-	}
-
-	exports.escape = escapeXML;
-
-
-/***/ },
-/* 58 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var entityMap = __webpack_require__(19),
-	    legacyMap = __webpack_require__(20),
-	    xmlMap    = __webpack_require__(21),
-	    decodeCodePoint = __webpack_require__(17);
-
-	var decodeXMLStrict  = getStrictDecoder(xmlMap),
-	    decodeHTMLStrict = getStrictDecoder(entityMap);
-
-	function getStrictDecoder(map){
-		var keys = Object.keys(map).join("|"),
-		    replace = getReplacer(map);
-
-		keys += "|#[xX][\\da-fA-F]+|#\\d+";
-
-		var re = new RegExp("&(?:" + keys + ");", "g");
-
-		return function(str){
-			return String(str).replace(re, replace);
-		};
-	}
-
-	var decodeHTML = (function(){
-		var legacy = Object.keys(legacyMap)
-			.sort(sorter);
-
-		var keys = Object.keys(entityMap)
-			.sort(sorter);
-
-		for(var i = 0, j = 0; i < keys.length; i++){
-			if(legacy[j] === keys[i]){
-				keys[i] += ";?";
-				j++;
-			} else {
-				keys[i] += ";";
-			}
-		}
-
-		var re = new RegExp("&(?:" + keys.join("|") + "|#[xX][\\da-fA-F]+;?|#\\d+;?)", "g"),
-		    replace = getReplacer(entityMap);
-
-		function replacer(str){
-			if(str.substr(-1) !== ";") str += ";";
-			return replace(str);
-		}
-
-		//TODO consider creating a merged map
-		return function(str){
-			return String(str).replace(re, replacer);
-		};
-	}());
-
-	function sorter(a, b){
-		return a < b ? 1 : -1;
-	}
-
-	function getReplacer(map){
-		return function replace(str){
-			if(str.charAt(1) === "#"){
-				if(str.charAt(2) === "X" || str.charAt(2) === "x"){
-					return decodeCodePoint(parseInt(str.substr(3), 16));
-				}
-				return decodeCodePoint(parseInt(str.substr(2), 10));
-			}
-			return map[str.slice(1, -1)];
-		};
-	}
-
-	module.exports = {
-		XML: decodeXMLStrict,
-		HTML: decodeHTML,
-		HTMLStrict: decodeHTMLStrict
-	};
-
-/***/ },
-/* 59 */
-/***/ function(module, exports) {
-
-	var getChildren = exports.getChildren = function(elem){
-		return elem.children;
-	};
-
-	var getParent = exports.getParent = function(elem){
-		return elem.parent;
-	};
-
-	exports.getSiblings = function(elem){
-		var parent = getParent(elem);
-		return parent ? getChildren(parent) : [elem];
-	};
-
-	exports.getAttributeValue = function(elem, name){
-		return elem.attribs && elem.attribs[name];
-	};
-
-	exports.hasAttrib = function(elem, name){
-		return !!elem.attribs && hasOwnProperty.call(elem.attribs, name);
-	};
-
-	exports.getName = function(elem){
-		return elem.name;
-	};
-
-
-/***/ },
-/* 60 */
-/***/ function(module, exports) {
-
-	exports.removeElement = function(elem){
-		if(elem.prev) elem.prev.next = elem.next;
-		if(elem.next) elem.next.prev = elem.prev;
-
-		if(elem.parent){
-			var childs = elem.parent.children;
-			childs.splice(childs.lastIndexOf(elem), 1);
-		}
-	};
-
-	exports.replaceElement = function(elem, replacement){
-		var prev = replacement.prev = elem.prev;
-		if(prev){
-			prev.next = replacement;
-		}
-
-		var next = replacement.next = elem.next;
-		if(next){
-			next.prev = replacement;
-		}
-
-		var parent = replacement.parent = elem.parent;
-		if(parent){
-			var childs = parent.children;
-			childs[childs.lastIndexOf(elem)] = replacement;
-		}
-	};
-
-	exports.appendChild = function(elem, child){
-		child.parent = elem;
-
-		if(elem.children.push(child) !== 1){
-			var sibling = elem.children[elem.children.length - 2];
-			sibling.next = child;
-			child.prev = sibling;
-			child.next = null;
-		}
-	};
-
-	exports.append = function(elem, next){
-		var parent = elem.parent,
-			currNext = elem.next;
-
-		next.next = currNext;
-		next.prev = elem;
-		elem.next = next;
-		next.parent = parent;
-
-		if(currNext){
-			currNext.prev = next;
-			if(parent){
-				var childs = parent.children;
-				childs.splice(childs.lastIndexOf(currNext), 0, next);
-			}
-		} else if(parent){
-			parent.children.push(next);
-		}
-	};
-
-	exports.prepend = function(elem, prev){
-		var parent = elem.parent;
-		if(parent){
-			var childs = parent.children;
-			childs.splice(childs.lastIndexOf(elem), 0, prev);
-		}
-
-		if(elem.prev){
-			elem.prev.next = prev;
-		}
-		
-		prev.parent = parent;
-		prev.prev = elem.prev;
-		prev.next = elem;
-		elem.prev = prev;
-	};
-
-
-
-
-/***/ },
-/* 61 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var isTag = __webpack_require__(23).isTag;
-
-	module.exports = {
-		filter: filter,
-		find: find,
-		findOneChild: findOneChild,
-		findOne: findOne,
-		existsOne: existsOne,
-		findAll: findAll
-	};
-
-	function filter(test, element, recurse, limit){
-		if(!Array.isArray(element)) element = [element];
-
-		if(typeof limit !== "number" || !isFinite(limit)){
-			limit = Infinity;
-		}
-		return find(test, element, recurse !== false, limit);
-	}
-
-	function find(test, elems, recurse, limit){
-		var result = [], childs;
-
-		for(var i = 0, j = elems.length; i < j; i++){
-			if(test(elems[i])){
-				result.push(elems[i]);
-				if(--limit <= 0) break;
-			}
-
-			childs = elems[i].children;
-			if(recurse && childs && childs.length > 0){
-				childs = find(test, childs, recurse, limit);
-				result = result.concat(childs);
-				limit -= childs.length;
-				if(limit <= 0) break;
-			}
-		}
-
-		return result;
-	}
-
-	function findOneChild(test, elems){
-		for(var i = 0, l = elems.length; i < l; i++){
-			if(test(elems[i])) return elems[i];
-		}
-
-		return null;
-	}
-
-	function findOne(test, elems){
-		var elem = null;
-
-		for(var i = 0, l = elems.length; i < l && !elem; i++){
-			if(!isTag(elems[i])){
-				continue;
-			} else if(test(elems[i])){
-				elem = elems[i];
-			} else if(elems[i].children.length > 0){
-				elem = findOne(test, elems[i].children);
-			}
-		}
-
-		return elem;
-	}
-
-	function existsOne(test, elems){
-		for(var i = 0, l = elems.length; i < l; i++){
-			if(
-				isTag(elems[i]) && (
-					test(elems[i]) || (
-						elems[i].children.length > 0 &&
-						existsOne(test, elems[i].children)
-					)
-				)
-			){
-				return true;
-			}
-		}
-
-		return false;
-	}
-
-	function findAll(test, elems){
-		var result = [];
-		for(var i = 0, j = elems.length; i < j; i++){
-			if(!isTag(elems[i])) continue;
-			if(test(elems[i])) result.push(elems[i]);
-
-			if(elems[i].children.length > 0){
-				result = result.concat(findAll(test, elems[i].children));
-			}
-		}
-		return result;
-	}
-
-
-/***/ },
-/* 62 */
-/***/ function(module, exports, __webpack_require__) {
-
-	var ElementType = __webpack_require__(23);
-	var isTag = exports.isTag = ElementType.isTag;
-
-	exports.testElement = function(options, element){
-		for(var key in options){
-			if(!options.hasOwnProperty(key));
-			else if(key === "tag_name"){
-				if(!isTag(element) || !options.tag_name(element.name)){
-					return false;
-				}
-			} else if(key === "tag_type"){
-				if(!options.tag_type(element.type)) return false;
-			} else if(key === "tag_contains"){
-				if(isTag(element) || !options.tag_contains(element.data)){
-					return false;
-				}
-			} else if(!element.attribs || !options[key](element.attribs[key])){
-				return false;
-			}
-		}
-		return true;
-	};
-
-	var Checks = {
-		tag_name: function(name){
-			if(typeof name === "function"){
-				return function(elem){ return isTag(elem) && name(elem.name); };
-			} else if(name === "*"){
-				return isTag;
-			} else {
-				return function(elem){ return isTag(elem) && elem.name === name; };
-			}
-		},
-		tag_type: function(type){
-			if(typeof type === "function"){
-				return function(elem){ return type(elem.type); };
-			} else {
-				return function(elem){ return elem.type === type; };
-			}
-		},
-		tag_contains: function(data){
-			if(typeof data === "function"){
-				return function(elem){ return !isTag(elem) && data(elem.data); };
-			} else {
-				return function(elem){ return !isTag(elem) && elem.data === data; };
-			}
-		}
-	};
-
-	function getAttribCheck(attrib, value){
-		if(typeof value === "function"){
-			return function(elem){ return elem.attribs && value(elem.attribs[attrib]); };
-		} else {
-			return function(elem){ return elem.attribs && elem.attribs[attrib] === value; };
-		}
-	}
-
-	function combineFuncs(a, b){
-		return function(elem){
-			return a(elem) || b(elem);
-		};
-	}
-
-	exports.getElements = function(options, element, recurse, limit){
-		var funcs = Object.keys(options).map(function(key){
-			var value = options[key];
-			return key in Checks ? Checks[key](value) : getAttribCheck(key, value);
-		});
-
-		return funcs.length === 0 ? [] : this.filter(
-			funcs.reduce(combineFuncs),
-			element, recurse, limit
-		);
-	};
-
-	exports.getElementById = function(id, element, recurse){
-		if(!Array.isArray(element)) element = [element];
-		return this.findOne(getAttribCheck("id", id), element, recurse !== false);
-	};
-
-	exports.getElementsByTagName = function(name, element, recurse, limit){
-		return this.filter(Checks.tag_name(name), element, recurse, limit);
-	};
-
-	exports.getElementsByTagType = function(type, element, recurse, limit){
-		return this.filter(Checks.tag_type(type), element, recurse, limit);
-	};
-
-
-/***/ },
-/* 63 */
-/***/ function(module, exports) {
-
-	// removeSubsets
-	// Given an array of nodes, remove any member that is contained by another.
-	exports.removeSubsets = function(nodes) {
-		var idx = nodes.length, node, ancestor, replace;
-
-		// Check if each node (or one of its ancestors) is already contained in the
-		// array.
-		while (--idx > -1) {
-			node = ancestor = nodes[idx];
-
-			// Temporarily remove the node under consideration
-			nodes[idx] = null;
-			replace = true;
-
-			while (ancestor) {
-				if (nodes.indexOf(ancestor) > -1) {
-					replace = false;
-					nodes.splice(idx, 1);
-					break;
-				}
-				ancestor = ancestor.parent;
-			}
-
-			// If the node has been found to be unique, re-insert it.
-			if (replace) {
-				nodes[idx] = node;
-			}
-		}
-
-		return nodes;
-	};
-
-	// Source: http://dom.spec.whatwg.org/#dom-node-comparedocumentposition
-	var POSITION = {
-		DISCONNECTED: 1,
-		PRECEDING: 2,
-		FOLLOWING: 4,
-		CONTAINS: 8,
-		CONTAINED_BY: 16
-	};
-
-	// Compare the position of one node against another node in any other document.
-	// The return value is a bitmask with the following values:
-	//
-	// document order:
-	// > There is an ordering, document order, defined on all the nodes in the
-	// > document corresponding to the order in which the first character of the
-	// > XML representation of each node occurs in the XML representation of the
-	// > document after expansion of general entities. Thus, the document element
-	// > node will be the first node. Element nodes occur before their children.
-	// > Thus, document order orders element nodes in order of the occurrence of
-	// > their start-tag in the XML (after expansion of entities). The attribute
-	// > nodes of an element occur after the element and before its children. The
-	// > relative order of attribute nodes is implementation-dependent./
-	// Source:
-	// http://www.w3.org/TR/DOM-Level-3-Core/glossary.html#dt-document-order
-	//
-	// @argument {Node} nodaA The first node to use in the comparison
-	// @argument {Node} nodeB The second node to use in the comparison
-	//
-	// @return {Number} A bitmask describing the input nodes' relative position.
-	//         See http://dom.spec.whatwg.org/#dom-node-comparedocumentposition for
-	//         a description of these values.
-	var comparePos = exports.compareDocumentPosition = function(nodeA, nodeB) {
-		var aParents = [];
-		var bParents = [];
-		var current, sharedParent, siblings, aSibling, bSibling, idx;
-
-		if (nodeA === nodeB) {
-			return 0;
-		}
-
-		current = nodeA;
-		while (current) {
-			aParents.unshift(current);
-			current = current.parent;
-		}
-		current = nodeB;
-		while (current) {
-			bParents.unshift(current);
-			current = current.parent;
-		}
-
-		idx = 0;
-		while (aParents[idx] === bParents[idx]) {
-			idx++;
-		}
-
-		if (idx === 0) {
-			return POSITION.DISCONNECTED;
-		}
-
-		sharedParent = aParents[idx - 1];
-		siblings = sharedParent.children;
-		aSibling = aParents[idx];
-		bSibling = bParents[idx];
-
-		if (siblings.indexOf(aSibling) > siblings.indexOf(bSibling)) {
-			if (sharedParent === nodeB) {
-				return POSITION.FOLLOWING | POSITION.CONTAINED_BY;
-			}
-			return POSITION.FOLLOWING;
-		} else {
-			if (sharedParent === nodeA) {
-				return POSITION.PRECEDING | POSITION.CONTAINS;
-			}
-			return POSITION.PRECEDING;
-		}
-	};
-
-	// Sort an array of nodes based on their relative position in the document and
-	// remove any duplicate nodes. If the array contains nodes that do not belong
-	// to the same document, sort order is unspecified.
-	//
-	// @argument {Array} nodes Array of DOM nodes
-	//
-	// @returns {Array} collection of unique nodes, sorted in document order
-	exports.uniqueSort = function(nodes) {
-		var idx = nodes.length, node, position;
-
-		nodes = nodes.slice();
-
-		while (--idx > -1) {
-			node = nodes[idx];
-			position = nodes.indexOf(node);
-			if (position > -1 && position < idx) {
-				nodes.splice(idx, 1);
-			}
-		}
-		nodes.sort(function(a, b) {
-			var relative = comparePos(a, b);
-			if (relative & POSITION.PRECEDING) {
-				return -1;
-			} else if (relative & POSITION.FOLLOWING) {
-				return 1;
-			}
-			return 0;
-		});
-
-		return nodes;
-	};
-
-
-/***/ },
-/* 64 */
-/***/ function(module, exports, __webpack_require__) {
-
-	module.exports = CollectingHandler;
-
-	function CollectingHandler(cbs){
-		this._cbs = cbs || {};
-		this.events = [];
-	}
-
-	var EVENTS = __webpack_require__(14).EVENTS;
-	Object.keys(EVENTS).forEach(function(name){
-		if(EVENTS[name] === 0){
-			name = "on" + name;
-			CollectingHandler.prototype[name] = function(){
-				this.events.push([name]);
-				if(this._cbs[name]) this._cbs[name]();
-			};
-		} else if(EVENTS[name] === 1){
-			name = "on" + name;
-			CollectingHandler.prototype[name] = function(a){
-				this.events.push([name, a]);
-				if(this._cbs[name]) this._cbs[name](a);
-			};
-		} else if(EVENTS[name] === 2){
-			name = "on" + name;
-			CollectingHandler.prototype[name] = function(a, b){
-				this.events.push([name, a, b]);
-				if(this._cbs[name]) this._cbs[name](a, b);
-			};
-		} else {
-			throw Error("wrong number of arguments");
-		}
-	});
-
-	CollectingHandler.prototype.onreset = function(){
-		this.events = [];
-		if(this._cbs.onreset) this._cbs.onreset();
-	};
-
-	CollectingHandler.prototype.restart = function(){
-		if(this._cbs.onreset) this._cbs.onreset();
-
-		for(var i = 0, len = this.events.length; i < len; i++){
-			if(this._cbs[this.events[i][0]]){
-
-				var num = this.events[i].length;
-
-				if(num === 1){
-					this._cbs[this.events[i][0]]();
-				} else if(num === 2){
-					this._cbs[this.events[i][0]](this.events[i][1]);
-				} else {
-					this._cbs[this.events[i][0]](this.events[i][1], this.events[i][2]);
-				}
-			}
-		}
-	};
-
-
-/***/ },
-/* 65 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var normalizeOpts = __webpack_require__(66)
-	  , resolveLength = __webpack_require__(67)
-	  , plain         = __webpack_require__(73);
-
-	module.exports = function (fn/*, options*/) {
-		var options = normalizeOpts(arguments[1]), length;
-
-		if (!options.normalizer) {
-			length = options.length = resolveLength(options.length, fn.length, options.async);
-			if (length !== 0) {
-				if (options.primitive) {
-					if (length === false) {
-						options.normalizer = __webpack_require__(110);
-					} else if (length > 1) {
-						options.normalizer = __webpack_require__(111)(length);
-					}
-				} else {
-					if (length === false) options.normalizer = __webpack_require__(112)();
-					else if (length === 1) options.normalizer = __webpack_require__(114)();
-					else options.normalizer = __webpack_require__(115)(length);
-				}
-			}
-		}
-
-		// Assure extensions
-		if (options.async) __webpack_require__(116);
-		if (options.dispose) __webpack_require__(119);
-		if (options.maxAge) __webpack_require__(120);
-		if (options.max) __webpack_require__(123);
-		if (options.refCounter) __webpack_require__(125);
-
-		return plain(fn, options);
-	};
-
-
-/***/ },
-/* 66 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	var forEach = Array.prototype.forEach, create = Object.create;
-
-	var process = function (src, obj) {
-		var key;
-		for (key in src) obj[key] = src[key];
-	};
-
-	module.exports = function (options/*, …options*/) {
-		var result = create(null);
-		forEach.call(arguments, function (options) {
-			if (options == null) return;
-			process(Object(options), result);
-		});
-		return result;
-	};
-
-
-/***/ },
-/* 67 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toPosInt = __webpack_require__(68);
-
-	module.exports = function (optsLength, fnLength, isAsync) {
-		var length;
-		if (isNaN(optsLength)) {
-			length = fnLength;
-			if (!(length >= 0)) return 1;
-			if (isAsync && length) return length - 1;
-			return length;
-		}
-		if (optsLength === false) return false;
-		return toPosInt(optsLength);
-	};
-
-
-/***/ },
-/* 68 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toInteger = __webpack_require__(69)
-
-	  , max = Math.max;
-
-	module.exports = function (value) { return max(0, toInteger(value)); };
-
-
-/***/ },
-/* 69 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var sign = __webpack_require__(70)
-
-	  , abs = Math.abs, floor = Math.floor;
-
-	module.exports = function (value) {
-		if (isNaN(value)) return 0;
-		value = Number(value);
-		if ((value === 0) || !isFinite(value)) return value;
-		return sign(value) * floor(abs(value));
-	};
-
-
-/***/ },
-/* 70 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(71)()
-		? Math.sign
-		: __webpack_require__(72);
-
-
-/***/ },
-/* 71 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function () {
-		var sign = Math.sign;
-		if (typeof sign !== 'function') return false;
-		return ((sign(10) === 1) && (sign(-20) === -1));
-	};
-
-
-/***/ },
-/* 72 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function (value) {
-		value = Number(value);
-		if (isNaN(value) || (value === 0)) return value;
-		return (value > 0) ? 1 : -1;
-	};
-
-
-/***/ },
-/* 73 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var callable      = __webpack_require__(74)
-	  , forEach       = __webpack_require__(75)
-	  , extensions    = __webpack_require__(78)
-	  , configure     = __webpack_require__(79)
-	  , resolveLength = __webpack_require__(67)
-
-	  , hasOwnProperty = Object.prototype.hasOwnProperty;
-
-	module.exports = function self(fn/*, options */) {
-		var options, length, conf;
-
-		callable(fn);
-		options = Object(arguments[1]);
-
-		// Do not memoize already memoized function
-		if (hasOwnProperty.call(fn, '__memoized__') && !options.force) return fn;
-
-		// Resolve length;
-		length = resolveLength(options.length, fn.length, options.async && extensions.async);
-
-		// Configure cache map
-		conf = configure(fn, length, options);
-
-		// Bind eventual extensions
-		forEach(extensions, function (fn, name) {
-			if (options[name]) fn(options[name], conf, options);
-		});
-
-		if (self.__profiler__) self.__profiler__(conf);
-
-		conf.updateEnv();
-		return conf.memoized;
-	};
-
-
-/***/ },
-/* 74 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function (fn) {
-		if (typeof fn !== 'function') throw new TypeError(fn + " is not a function");
-		return fn;
-	};
-
-
-/***/ },
-/* 75 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(76)('forEach');
-
-
-/***/ },
-/* 76 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Internal method, used by iteration functions.
-	// Calls a function for each key-value pair found in object
-	// Optionally takes compareFn to iterate object in specific order
-
-	'use strict';
-
-	var callable = __webpack_require__(74)
-	  , value    = __webpack_require__(77)
-
-	  , bind = Function.prototype.bind, call = Function.prototype.call, keys = Object.keys
-	  , propertyIsEnumerable = Object.prototype.propertyIsEnumerable;
-
-	module.exports = function (method, defVal) {
-		return function (obj, cb/*, thisArg, compareFn*/) {
-			var list, thisArg = arguments[2], compareFn = arguments[3];
-			obj = Object(value(obj));
-			callable(cb);
-
-			list = keys(obj);
-			if (compareFn) {
-				list.sort((typeof compareFn === 'function') ? bind.call(compareFn, obj) : undefined);
-			}
-			if (typeof method !== 'function') method = list[method];
-			return call.call(method, list, function (key, index) {
-				if (!propertyIsEnumerable.call(obj, key)) return defVal;
-				return call.call(cb, thisArg, obj[key], key, obj, index);
-			});
-		};
-	};
-
-
-/***/ },
-/* 77 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function (value) {
-		if (value == null) throw new TypeError("Cannot use null or undefined");
-		return value;
-	};
-
-
-/***/ },
-/* 78 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-
-/***/ },
-/* 79 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var customError      = __webpack_require__(80)
-	  , defineLength     = __webpack_require__(87)
-	  , d                = __webpack_require__(89)
-	  , ee               = __webpack_require__(94).methods
-	  , resolveResolve   = __webpack_require__(95)
-	  , resolveNormalize = __webpack_require__(109)
-
-	  , apply = Function.prototype.apply, call = Function.prototype.call
-	  , create = Object.create, hasOwnProperty = Object.prototype.hasOwnProperty
-	  , defineProperties = Object.defineProperties
-	  , on = ee.on, emit = ee.emit;
-
-	module.exports = function (original, length, options) {
-		var cache = create(null), conf, memLength, get, set, del, clear, extDel, normalizer
-		  , getListeners, setListeners, deleteListeners, memoized, resolve;
-		if (length !== false) memLength = length;
-		else if (isNaN(original.length)) memLength = 1;
-		else memLength = original.length;
-
-		if (options.normalizer) {
-			normalizer = resolveNormalize(options.normalizer);
-			get = normalizer.get;
-			set = normalizer.set;
-			del = normalizer.delete;
-			clear = normalizer.clear;
-		}
-		if (options.resolvers != null) resolve = resolveResolve(options.resolvers);
-
-		if (get) {
-			memoized = defineLength(function (arg) {
-				var id, result, args = arguments;
-				if (resolve) args = resolve(args);
-				id = get(args);
-				if (id !== null) {
-					if (hasOwnProperty.call(cache, id)) {
-						if (getListeners) conf.emit('get', id, args, this);
-						return cache[id];
-					}
-				}
-				if (args.length === 1) result = call.call(original, this, args[0]);
-				else result = apply.call(original, this, args);
-				if (id === null) {
-					id = get(args);
-					if (id !== null) throw customError("Circular invocation", 'CIRCULAR_INVOCATION');
-					id = set(args);
-				} else if (hasOwnProperty.call(cache, id)) {
-					throw customError("Circular invocation", 'CIRCULAR_INVOCATION');
-				}
-				cache[id] = result;
-				if (setListeners) conf.emit('set', id);
-				return result;
-			}, memLength);
-		} else if (length === 0) {
-			memoized = function () {
-				var result;
-				if (hasOwnProperty.call(cache, 'data')) {
-					if (getListeners) conf.emit('get', 'data', arguments, this);
-					return cache.data;
-				}
-				if (!arguments.length) result = call.call(original, this);
-				else result = apply.call(original, this, arguments);
-				if (hasOwnProperty.call(cache, 'data')) {
-					throw customError("Circular invocation", 'CIRCULAR_INVOCATION');
-				}
-				cache.data = result;
-				if (setListeners) conf.emit('set', 'data');
-				return result;
-			};
-		} else {
-			memoized = function (arg) {
-				var result, args = arguments, id;
-				if (resolve) args = resolve(arguments);
-				id = String(args[0]);
-				if (hasOwnProperty.call(cache, id)) {
-					if (getListeners) conf.emit('get', id, args, this);
-					return cache[id];
-				}
-				if (args.length === 1) result = call.call(original, this, args[0]);
-				else result = apply.call(original, this, args);
-				if (hasOwnProperty.call(cache, id)) {
-					throw customError("Circular invocation", 'CIRCULAR_INVOCATION');
-				}
-				cache[id] = result;
-				if (setListeners) conf.emit('set', id);
-				return result;
-			};
-		}
-		conf = {
-			original: original,
-			memoized: memoized,
-			get: function (args) {
-				if (resolve) args = resolve(args);
-				if (get) return get(args);
-				return String(args[0]);
-			},
-			has: function (id) { return hasOwnProperty.call(cache, id); },
-			delete: function (id) {
-				var result;
-				if (!hasOwnProperty.call(cache, id)) return;
-				if (del) del(id);
-				result = cache[id];
-				delete cache[id];
-				if (deleteListeners) conf.emit('delete', id, result);
-			},
-			clear: function () {
-				var oldCache = cache;
-				if (clear) clear();
-				cache = create(null);
-				conf.emit('clear', oldCache);
-			},
-			on: function (type, listener) {
-				if (type === 'get') getListeners = true;
-				else if (type === 'set') setListeners = true;
-				else if (type === 'delete') deleteListeners = true;
-				return on.call(this, type, listener);
-			},
-			emit: emit,
-			updateEnv: function () { original = conf.original; }
-		};
-		if (get) {
-			extDel = defineLength(function (arg) {
-				var id, args = arguments;
-				if (resolve) args = resolve(args);
-				id = get(args);
-				if (id === null) return;
-				conf.delete(id);
-			}, memLength);
-		} else if (length === 0) {
-			extDel = function () { return conf.delete('data'); };
-		} else {
-			extDel = function (arg) {
-				if (resolve) arg = resolve(arguments)[0];
-				return conf.delete(arg);
-			};
-		}
-		defineProperties(memoized, {
-			__memoized__: d(true),
-			delete: d(extDel),
-			clear: d(conf.clear)
-		});
-		return conf;
-	};
-
-
-/***/ },
-/* 80 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var assign = __webpack_require__(81)
-
-	  , captureStackTrace = Error.captureStackTrace;
-
-	exports = module.exports = function (message/*, code, ext*/) {
-		var err = new Error(), code = arguments[1], ext = arguments[2];
-		if (ext == null) {
-			if (code && (typeof code === 'object')) {
-				ext = code;
-				code = null;
-			}
-		}
-		if (ext != null) assign(err, ext);
-		err.message = String(message);
-		if (code != null) err.code = String(code);
-		if (captureStackTrace) captureStackTrace(err, exports);
-		return err;
-	};
-
-
-/***/ },
-/* 81 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(82)()
-		? Object.assign
-		: __webpack_require__(83);
-
-
-/***/ },
-/* 82 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function () {
-		var assign = Object.assign, obj;
-		if (typeof assign !== 'function') return false;
-		obj = { foo: 'raz' };
-		assign(obj, { bar: 'dwa' }, { trzy: 'trzy' });
-		return (obj.foo + obj.bar + obj.trzy) === 'razdwatrzy';
-	};
-
-
-/***/ },
-/* 83 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var keys  = __webpack_require__(84)
-	  , value = __webpack_require__(77)
-
-	  , max = Math.max;
-
-	module.exports = function (dest, src/*, …srcn*/) {
-		var error, i, l = max(arguments.length, 2), assign;
-		dest = Object(value(dest));
-		assign = function (key) {
-			try { dest[key] = src[key]; } catch (e) {
-				if (!error) error = e;
-			}
-		};
-		for (i = 1; i < l; ++i) {
-			src = arguments[i];
-			keys(src).forEach(assign);
-		}
-		if (error !== undefined) throw error;
-		return dest;
-	};
-
-
-/***/ },
-/* 84 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(85)()
-		? Object.keys
-		: __webpack_require__(86);
-
-
-/***/ },
-/* 85 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function () {
-		try {
-			Object.keys('primitive');
-			return true;
-		} catch (e) { return false; }
-	};
-
-
-/***/ },
-/* 86 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	var keys = Object.keys;
-
-	module.exports = function (object) {
-		return keys(object == null ? object : Object(object));
-	};
-
-
-/***/ },
-/* 87 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toPosInt = __webpack_require__(68)
-
-	  , test = function (a, b) {}, desc, defineProperty
-	  , generate, mixin;
-
-	try {
-		Object.defineProperty(test, 'length', { configurable: true, writable: false,
-			enumerable: false, value: 1 });
-	} catch (ignore) {}
-
-	if (test.length === 1) {
-		// ES6
-		desc = { configurable: true, writable: false, enumerable: false };
-		defineProperty = Object.defineProperty;
-		module.exports = function (fn, length) {
-			length = toPosInt(length);
-			if (fn.length === length) return fn;
-			desc.value = length;
-			return defineProperty(fn, 'length', desc);
-		};
-	} else {
-		mixin = __webpack_require__(88);
-		generate = (function () {
-			var cache = [];
-			return function (l) {
-				var args, i = 0;
-				if (cache[l]) return cache[l];
-				args = [];
-				while (l--) args.push('a' + (++i).toString(36));
-				return new Function('fn', 'return function (' + args.join(', ') +
-					') { return fn.apply(this, arguments); };');
-			};
-		}());
-		module.exports = function (src, length) {
-			var target;
-			length = toPosInt(length);
-			if (src.length === length) return src;
-			target = generate(length)(src);
-			try { mixin(target, src); } catch (ignore) {}
-			return target;
-		};
-	}
-
-
-/***/ },
-/* 88 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var value = __webpack_require__(77)
-
-	  , defineProperty = Object.defineProperty
-	  , getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor
-	  , getOwnPropertyNames = Object.getOwnPropertyNames;
-
-	module.exports = function (target, source) {
-		var error;
-		target = Object(value(target));
-		getOwnPropertyNames(Object(value(source))).forEach(function (name) {
-			try {
-				defineProperty(target, name, getOwnPropertyDescriptor(source, name));
-			} catch (e) { error = e; }
-		});
-		if (error !== undefined) throw error;
-		return target;
-	};
-
-
-/***/ },
-/* 89 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var assign        = __webpack_require__(81)
-	  , normalizeOpts = __webpack_require__(66)
-	  , isCallable    = __webpack_require__(90)
-	  , contains      = __webpack_require__(91)
-
-	  , d;
-
-	d = module.exports = function (dscr, value/*, options*/) {
-		var c, e, w, options, desc;
-		if ((arguments.length < 2) || (typeof dscr !== 'string')) {
-			options = value;
-			value = dscr;
-			dscr = null;
-		} else {
-			options = arguments[2];
-		}
-		if (dscr == null) {
-			c = w = true;
-			e = false;
-		} else {
-			c = contains.call(dscr, 'c');
-			e = contains.call(dscr, 'e');
-			w = contains.call(dscr, 'w');
-		}
-
-		desc = { value: value, configurable: c, enumerable: e, writable: w };
-		return !options ? desc : assign(normalizeOpts(options), desc);
-	};
-
-	d.gs = function (dscr, get, set/*, options*/) {
-		var c, e, options, desc;
-		if (typeof dscr !== 'string') {
-			options = set;
-			set = get;
-			get = dscr;
-			dscr = null;
-		} else {
-			options = arguments[3];
-		}
-		if (get == null) {
-			get = undefined;
-		} else if (!isCallable(get)) {
-			options = get;
-			get = set = undefined;
-		} else if (set == null) {
-			set = undefined;
-		} else if (!isCallable(set)) {
-			options = set;
-			set = undefined;
-		}
-		if (dscr == null) {
-			c = true;
-			e = false;
-		} else {
-			c = contains.call(dscr, 'c');
-			e = contains.call(dscr, 'e');
-		}
-
-		desc = { get: get, set: set, configurable: c, enumerable: e };
-		return !options ? desc : assign(normalizeOpts(options), desc);
-	};
-
-
-/***/ },
-/* 90 */
-/***/ function(module, exports) {
-
-	// Deprecated
-
-	'use strict';
-
-	module.exports = function (obj) { return typeof obj === 'function'; };
-
-
-/***/ },
-/* 91 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(92)()
-		? String.prototype.contains
-		: __webpack_require__(93);
-
-
-/***/ },
-/* 92 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	var str = 'razdwatrzy';
-
-	module.exports = function () {
-		if (typeof str.contains !== 'function') return false;
-		return ((str.contains('dwa') === true) && (str.contains('foo') === false));
-	};
-
-
-/***/ },
-/* 93 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	var indexOf = String.prototype.indexOf;
-
-	module.exports = function (searchString/*, position*/) {
-		return indexOf.call(this, searchString, arguments[1]) > -1;
-	};
-
-
-/***/ },
-/* 94 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var d        = __webpack_require__(89)
-	  , callable = __webpack_require__(74)
-
-	  , apply = Function.prototype.apply, call = Function.prototype.call
-	  , create = Object.create, defineProperty = Object.defineProperty
-	  , defineProperties = Object.defineProperties
-	  , hasOwnProperty = Object.prototype.hasOwnProperty
-	  , descriptor = { configurable: true, enumerable: false, writable: true }
-
-	  , on, once, off, emit, methods, descriptors, base;
-
-	on = function (type, listener) {
-		var data;
-
-		callable(listener);
-
-		if (!hasOwnProperty.call(this, '__ee__')) {
-			data = descriptor.value = create(null);
-			defineProperty(this, '__ee__', descriptor);
-			descriptor.value = null;
-		} else {
-			data = this.__ee__;
-		}
-		if (!data[type]) data[type] = listener;
-		else if (typeof data[type] === 'object') data[type].push(listener);
-		else data[type] = [data[type], listener];
-
-		return this;
-	};
-
-	once = function (type, listener) {
-		var once, self;
-
-		callable(listener);
-		self = this;
-		on.call(this, type, once = function () {
-			off.call(self, type, once);
-			apply.call(listener, this, arguments);
-		});
-
-		once.__eeOnceListener__ = listener;
-		return this;
-	};
-
-	off = function (type, listener) {
-		var data, listeners, candidate, i;
-
-		callable(listener);
-
-		if (!hasOwnProperty.call(this, '__ee__')) return this;
-		data = this.__ee__;
-		if (!data[type]) return this;
-		listeners = data[type];
-
-		if (typeof listeners === 'object') {
-			for (i = 0; (candidate = listeners[i]); ++i) {
-				if ((candidate === listener) ||
-						(candidate.__eeOnceListener__ === listener)) {
-					if (listeners.length === 2) data[type] = listeners[i ? 0 : 1];
-					else listeners.splice(i, 1);
-				}
-			}
-		} else {
-			if ((listeners === listener) ||
-					(listeners.__eeOnceListener__ === listener)) {
-				delete data[type];
-			}
-		}
-
-		return this;
-	};
-
-	emit = function (type) {
-		var i, l, listener, listeners, args;
-
-		if (!hasOwnProperty.call(this, '__ee__')) return;
-		listeners = this.__ee__[type];
-		if (!listeners) return;
-
-		if (typeof listeners === 'object') {
-			l = arguments.length;
-			args = new Array(l - 1);
-			for (i = 1; i < l; ++i) args[i - 1] = arguments[i];
-
-			listeners = listeners.slice();
-			for (i = 0; (listener = listeners[i]); ++i) {
-				apply.call(listener, this, args);
-			}
-		} else {
-			switch (arguments.length) {
-			case 1:
-				call.call(listeners, this);
-				break;
-			case 2:
-				call.call(listeners, this, arguments[1]);
-				break;
-			case 3:
-				call.call(listeners, this, arguments[1], arguments[2]);
-				break;
-			default:
-				l = arguments.length;
-				args = new Array(l - 1);
-				for (i = 1; i < l; ++i) {
-					args[i - 1] = arguments[i];
-				}
-				apply.call(listeners, this, args);
-			}
-		}
-	};
-
-	methods = {
-		on: on,
-		once: once,
-		off: off,
-		emit: emit
-	};
-
-	descriptors = {
-		on: d(on),
-		once: d(once),
-		off: d(off),
-		emit: d(emit)
-	};
-
-	base = defineProperties({}, descriptors);
-
-	module.exports = exports = function (o) {
-		return (o == null) ? create(base) : defineProperties(Object(o), descriptors);
-	};
-	exports.methods = methods;
-
-
-/***/ },
-/* 95 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toArray  = __webpack_require__(96)
-	  , callable = __webpack_require__(74)
-
-	  , slice = Array.prototype.slice
-	  , resolveArgs;
-
-	resolveArgs = function (args) {
-		return this.map(function (r, i) {
-			return r ? r(args[i]) : args[i];
-		}).concat(slice.call(args, this.length));
-	};
-
-	module.exports = function (resolvers) {
-		resolvers = toArray(resolvers);
-		resolvers.forEach(function (r) {
-			if (r != null) callable(r);
-		});
-		return resolveArgs.bind(resolvers);
-	};
-
-
-/***/ },
-/* 96 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var from = __webpack_require__(97)
-
-	  , isArray = Array.isArray;
-
-	module.exports = function (arrayLike) {
-		return isArray(arrayLike) ? arrayLike : from(arrayLike);
-	};
-
-
-/***/ },
-/* 97 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(98)()
-		? Array.from
-		: __webpack_require__(99);
-
-
-/***/ },
-/* 98 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function () {
-		var from = Array.from, arr, result;
-		if (typeof from !== 'function') return false;
-		arr = ['raz', 'dwa'];
-		result = from(arr);
-		return Boolean(result && (result !== arr) && (result[1] === 'dwa'));
-	};
-
-
-/***/ },
-/* 99 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var iteratorSymbol = __webpack_require__(100).iterator
-	  , isArguments    = __webpack_require__(105)
-	  , isFunction     = __webpack_require__(106)
-	  , toPosInt       = __webpack_require__(68)
-	  , callable       = __webpack_require__(74)
-	  , validValue     = __webpack_require__(77)
-	  , isString       = __webpack_require__(108)
-
-	  , isArray = Array.isArray, call = Function.prototype.call
-	  , desc = { configurable: true, enumerable: true, writable: true, value: null }
-	  , defineProperty = Object.defineProperty;
-
-	module.exports = function (arrayLike/*, mapFn, thisArg*/) {
-		var mapFn = arguments[1], thisArg = arguments[2], Constructor, i, j, arr, l, code, iterator
-		  , result, getIterator, value;
-
-		arrayLike = Object(validValue(arrayLike));
-
-		if (mapFn != null) callable(mapFn);
-		if (!this || (this === Array) || !isFunction(this)) {
-			// Result: Plain array
-			if (!mapFn) {
-				if (isArguments(arrayLike)) {
-					// Source: Arguments
-					l = arrayLike.length;
-					if (l !== 1) return Array.apply(null, arrayLike);
-					arr = new Array(1);
-					arr[0] = arrayLike[0];
-					return arr;
-				}
-				if (isArray(arrayLike)) {
-					// Source: Array
-					arr = new Array(l = arrayLike.length);
-					for (i = 0; i < l; ++i) arr[i] = arrayLike[i];
-					return arr;
-				}
-			}
-			arr = [];
-		} else {
-			// Result: Non plain array
-			Constructor = this;
-		}
-
-		if (!isArray(arrayLike)) {
-			if ((getIterator = arrayLike[iteratorSymbol]) !== undefined) {
-				// Source: Iterator
-				iterator = callable(getIterator).call(arrayLike);
-				if (Constructor) arr = new Constructor();
-				result = iterator.next();
-				i = 0;
-				while (!result.done) {
-					value = mapFn ? call.call(mapFn, thisArg, result.value, i) : result.value;
-					if (!Constructor) {
-						arr[i] = value;
-					} else {
-						desc.value = value;
-						defineProperty(arr, i, desc);
-					}
-					result = iterator.next();
-					++i;
-				}
-				l = i;
-			} else if (isString(arrayLike)) {
-				// Source: String
-				l = arrayLike.length;
-				if (Constructor) arr = new Constructor();
-				for (i = 0, j = 0; i < l; ++i) {
-					value = arrayLike[i];
-					if ((i + 1) < l) {
-						code = value.charCodeAt(0);
-						if ((code >= 0xD800) && (code <= 0xDBFF)) value += arrayLike[++i];
-					}
-					value = mapFn ? call.call(mapFn, thisArg, value, j) : value;
-					if (!Constructor) {
-						arr[j] = value;
-					} else {
-						desc.value = value;
-						defineProperty(arr, j, desc);
-					}
-					++j;
-				}
-				l = j;
-			}
-		}
-		if (l === undefined) {
-			// Source: array or array-like
-			l = toPosInt(arrayLike.length);
-			if (Constructor) arr = new Constructor(l);
-			for (i = 0; i < l; ++i) {
-				value = mapFn ? call.call(mapFn, thisArg, arrayLike[i], i) : arrayLike[i];
-				if (!Constructor) {
-					arr[i] = value;
-				} else {
-					desc.value = value;
-					defineProperty(arr, i, desc);
-				}
-			}
-		}
-		if (Constructor) {
-			desc.value = null;
-			arr.length = l;
-		}
-		return arr;
-	};
-
-
-/***/ },
-/* 100 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	module.exports = __webpack_require__(101)() ? Symbol : __webpack_require__(102);
-
-
-/***/ },
-/* 101 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function () {
-		var symbol;
-		if (typeof Symbol !== 'function') return false;
-		symbol = Symbol('test symbol');
-		try { String(symbol); } catch (e) { return false; }
-		if (typeof Symbol.iterator === 'symbol') return true;
-
-		// Return 'true' for polyfills
-		if (typeof Symbol.isConcatSpreadable !== 'object') return false;
-		if (typeof Symbol.iterator !== 'object') return false;
-		if (typeof Symbol.toPrimitive !== 'object') return false;
-		if (typeof Symbol.toStringTag !== 'object') return false;
-		if (typeof Symbol.unscopables !== 'object') return false;
-
-		return true;
-	};
-
-
-/***/ },
-/* 102 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// ES2015 Symbol polyfill for environments that do not support it (or partially support it_
-
-	'use strict';
-
-	var d              = __webpack_require__(89)
-	  , validateSymbol = __webpack_require__(103)
-
-	  , create = Object.create, defineProperties = Object.defineProperties
-	  , defineProperty = Object.defineProperty, objPrototype = Object.prototype
-	  , NativeSymbol, SymbolPolyfill, HiddenSymbol, globalSymbols = create(null);
-
-	if (typeof Symbol === 'function') NativeSymbol = Symbol;
-
-	var generateName = (function () {
-		var created = create(null);
-		return function (desc) {
-			var postfix = 0, name, ie11BugWorkaround;
-			while (created[desc + (postfix || '')]) ++postfix;
-			desc += (postfix || '');
-			created[desc] = true;
-			name = '@@' + desc;
-			defineProperty(objPrototype, name, d.gs(null, function (value) {
-				// For IE11 issue see:
-				// https://connect.microsoft.com/IE/feedbackdetail/view/1928508/
-				//    ie11-broken-getters-on-dom-objects
-				// https://github.com/medikoo/es6-symbol/issues/12
-				if (ie11BugWorkaround) return;
-				ie11BugWorkaround = true;
-				defineProperty(this, name, d(value));
-				ie11BugWorkaround = false;
-			}));
-			return name;
-		};
-	}());
-
-	// Internal constructor (not one exposed) for creating Symbol instances.
-	// This one is used to ensure that `someSymbol instanceof Symbol` always return false
-	HiddenSymbol = function Symbol(description) {
-		if (this instanceof HiddenSymbol) throw new TypeError('TypeError: Symbol is not a constructor');
-		return SymbolPolyfill(description);
-	};
-
-	// Exposed `Symbol` constructor
-	// (returns instances of HiddenSymbol)
-	module.exports = SymbolPolyfill = function Symbol(description) {
-		var symbol;
-		if (this instanceof Symbol) throw new TypeError('TypeError: Symbol is not a constructor');
-		symbol = create(HiddenSymbol.prototype);
-		description = (description === undefined ? '' : String(description));
-		return defineProperties(symbol, {
-			__description__: d('', description),
-			__name__: d('', generateName(description))
-		});
-	};
-	defineProperties(SymbolPolyfill, {
-		for: d(function (key) {
-			if (globalSymbols[key]) return globalSymbols[key];
-			return (globalSymbols[key] = SymbolPolyfill(String(key)));
-		}),
-		keyFor: d(function (s) {
-			var key;
-			validateSymbol(s);
-			for (key in globalSymbols) if (globalSymbols[key] === s) return key;
-		}),
-
-		// If there's native implementation of given symbol, let's fallback to it
-		// to ensure proper interoperability with other native functions e.g. Array.from
-		hasInstance: d('', (NativeSymbol && NativeSymbol.hasInstance) || SymbolPolyfill('hasInstance')),
-		isConcatSpreadable: d('', (NativeSymbol && NativeSymbol.isConcatSpreadable) ||
-			SymbolPolyfill('isConcatSpreadable')),
-		iterator: d('', (NativeSymbol && NativeSymbol.iterator) || SymbolPolyfill('iterator')),
-		match: d('', (NativeSymbol && NativeSymbol.match) || SymbolPolyfill('match')),
-		replace: d('', (NativeSymbol && NativeSymbol.replace) || SymbolPolyfill('replace')),
-		search: d('', (NativeSymbol && NativeSymbol.search) || SymbolPolyfill('search')),
-		species: d('', (NativeSymbol && NativeSymbol.species) || SymbolPolyfill('species')),
-		split: d('', (NativeSymbol && NativeSymbol.split) || SymbolPolyfill('split')),
-		toPrimitive: d('', (NativeSymbol && NativeSymbol.toPrimitive) || SymbolPolyfill('toPrimitive')),
-		toStringTag: d('', (NativeSymbol && NativeSymbol.toStringTag) || SymbolPolyfill('toStringTag')),
-		unscopables: d('', (NativeSymbol && NativeSymbol.unscopables) || SymbolPolyfill('unscopables'))
-	});
-
-	// Internal tweaks for real symbol producer
-	defineProperties(HiddenSymbol.prototype, {
-		constructor: d(SymbolPolyfill),
-		toString: d('', function () { return this.__name__; })
-	});
-
-	// Proper implementation of methods exposed on Symbol.prototype
-	// They won't be accessible on produced symbol instances as they derive from HiddenSymbol.prototype
-	defineProperties(SymbolPolyfill.prototype, {
-		toString: d(function () { return 'Symbol (' + validateSymbol(this).__description__ + ')'; }),
-		valueOf: d(function () { return validateSymbol(this); })
-	});
-	defineProperty(SymbolPolyfill.prototype, SymbolPolyfill.toPrimitive, d('',
-		function () { return validateSymbol(this); }));
-	defineProperty(SymbolPolyfill.prototype, SymbolPolyfill.toStringTag, d('c', 'Symbol'));
-
-	// Proper implementaton of toPrimitive and toStringTag for returned symbol instances
-	defineProperty(HiddenSymbol.prototype, SymbolPolyfill.toStringTag,
-		d('c', SymbolPolyfill.prototype[SymbolPolyfill.toStringTag]));
-
-	// Note: It's important to define `toPrimitive` as last one, as some implementations
-	// implement `toPrimitive` natively without implementing `toStringTag` (or other specified symbols)
-	// And that may invoke error in definition flow:
-	// See: https://github.com/medikoo/es6-symbol/issues/13#issuecomment-164146149
-	defineProperty(HiddenSymbol.prototype, SymbolPolyfill.toPrimitive,
-		d('c', SymbolPolyfill.prototype[SymbolPolyfill.toPrimitive]));
-
-
-/***/ },
-/* 103 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var isSymbol = __webpack_require__(104);
-
-	module.exports = function (value) {
-		if (!isSymbol(value)) throw new TypeError(value + " is not a symbol");
-		return value;
-	};
-
-
-/***/ },
-/* 104 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function (x) {
-		return (x && ((typeof x === 'symbol') || (x['@@toStringTag'] === 'Symbol'))) || false;
-	};
-
-
-/***/ },
-/* 105 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	var toString = Object.prototype.toString
-
-	  , id = toString.call((function () { return arguments; }()));
-
-	module.exports = function (x) { return (toString.call(x) === id); };
-
-
-/***/ },
-/* 106 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toString = Object.prototype.toString
-
-	  , id = toString.call(__webpack_require__(107));
-
-	module.exports = function (f) {
-		return (typeof f === "function") && (toString.call(f) === id);
-	};
-
-
-/***/ },
-/* 107 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function () {};
-
-
-/***/ },
-/* 108 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	var toString = Object.prototype.toString
-
-	  , id = toString.call('');
-
-	module.exports = function (x) {
-		return (typeof x === 'string') || (x && (typeof x === 'object') &&
-			((x instanceof String) || (toString.call(x) === id))) || false;
-	};
-
-
-/***/ },
-/* 109 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var callable = __webpack_require__(74);
-
-	module.exports = function (userNormalizer) {
-		var normalizer;
-		if (typeof userNormalizer === 'function') return { set: userNormalizer, get: userNormalizer };
-		normalizer = { get: callable(userNormalizer.get) };
-		if (userNormalizer.set !== undefined) {
-			normalizer.set = callable(userNormalizer.set);
-			normalizer.delete = callable(userNormalizer.delete);
-			normalizer.clear = callable(userNormalizer.clear);
-			return normalizer;
-		}
-		normalizer.set = normalizer.get;
-		return normalizer;
-	};
-
-
-/***/ },
-/* 110 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function (args) {
-		var id, i, length = args.length;
-		if (!length) return '\u0002';
-		id = String(args[i = 0]);
-		while (--length) id += '\u0001' + args[++i];
-		return id;
-	};
-
-
-/***/ },
-/* 111 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = function (length) {
-		if (!length) {
-			return function () { return ''; };
-		}
-		return function (args) {
-			var id = String(args[0]), i = 0, l = length;
-			while (--l) { id += '\u0001' + args[++i]; }
-			return id;
-		};
-	};
-
-
-/***/ },
-/* 112 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var indexOf = __webpack_require__(113)
-	  , create = Object.create;
-
-	module.exports = function () {
-		var lastId = 0, map = [], cache = create(null);
-		return {
-			get: function (args) {
-				var index = 0, set = map, i, length = args.length;
-				if (length === 0) return set[length] || null;
-				if ((set = set[length])) {
-					while (index < (length - 1)) {
-						i = indexOf.call(set[0], args[index]);
-						if (i === -1) return null;
-						set = set[1][i];
-						++index;
-					}
-					i = indexOf.call(set[0], args[index]);
-					if (i === -1) return null;
-					return set[1][i] || null;
-				}
-				return null;
-			},
-			set: function (args) {
-				var index = 0, set = map, i, length = args.length;
-				if (length === 0) {
-					set[length] = ++lastId;
-				} else {
-					if (!set[length]) {
-						set[length] = [[], []];
-					}
-					set = set[length];
-					while (index < (length - 1)) {
-						i = indexOf.call(set[0], args[index]);
-						if (i === -1) {
-							i = set[0].push(args[index]) - 1;
-							set[1].push([[], []]);
-						}
-						set = set[1][i];
-						++index;
-					}
-					i = indexOf.call(set[0], args[index]);
-					if (i === -1) {
-						i = set[0].push(args[index]) - 1;
-					}
-					set[1][i] = ++lastId;
-				}
-				cache[lastId] = args;
-				return lastId;
-			},
-			delete: function (id) {
-				var index = 0, set = map, i, args = cache[id], length = args.length
-				  , path = [];
-				if (length === 0) {
-					delete set[length];
-				} else if ((set = set[length])) {
-					while (index < (length - 1)) {
-						i = indexOf.call(set[0], args[index]);
-						if (i === -1) {
-							return;
-						}
-						path.push(set, i);
-						set = set[1][i];
-						++index;
-					}
-					i = indexOf.call(set[0], args[index]);
-					if (i === -1) {
-						return;
-					}
-					id = set[1][i];
-					set[0].splice(i, 1);
-					set[1].splice(i, 1);
-					while (!set[0].length && path.length) {
-						i = path.pop();
-						set = path.pop();
-						set[0].splice(i, 1);
-						set[1].splice(i, 1);
-					}
-				}
-				delete cache[id];
-			},
-			clear: function () {
-				map = [];
-				cache = create(null);
-			}
-		};
-	};
-
-
-/***/ },
-/* 113 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toPosInt = __webpack_require__(68)
-	  , value    = __webpack_require__(77)
-
-	  , indexOf = Array.prototype.indexOf
-	  , hasOwnProperty = Object.prototype.hasOwnProperty
-	  , abs = Math.abs, floor = Math.floor;
-
-	module.exports = function (searchElement/*, fromIndex*/) {
-		var i, l, fromIndex, val;
-		if (searchElement === searchElement) { //jslint: ignore
-			return indexOf.apply(this, arguments);
-		}
-
-		l = toPosInt(value(this).length);
-		fromIndex = arguments[1];
-		if (isNaN(fromIndex)) fromIndex = 0;
-		else if (fromIndex >= 0) fromIndex = floor(fromIndex);
-		else fromIndex = toPosInt(this.length) - floor(abs(fromIndex));
-
-		for (i = fromIndex; i < l; ++i) {
-			if (hasOwnProperty.call(this, i)) {
-				val = this[i];
-				if (val !== val) return i; //jslint: ignore
-			}
-		}
-		return -1;
-	};
-
-
-/***/ },
-/* 114 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var indexOf = __webpack_require__(113);
-
-	module.exports = function () {
-		var lastId = 0, argsMap = [], cache = [];
-		return {
-			get: function (args) {
-				var index = indexOf.call(argsMap, args[0]);
-				return (index === -1) ? null : cache[index];
-			},
-			set: function (args) {
-				argsMap.push(args[0]);
-				cache.push(++lastId);
-				return lastId;
-			},
-			delete: function (id) {
-				var index = indexOf.call(cache, id);
-				if (index !== -1) {
-					argsMap.splice(index, 1);
-					cache.splice(index, 1);
-				}
-			},
-			clear: function () {
-				argsMap = [];
-				cache = [];
-			}
-		};
-	};
-
-
-/***/ },
-/* 115 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var indexOf = __webpack_require__(113)
-	  , create = Object.create;
-
-	module.exports = function (length) {
-		var lastId = 0, map = [[], []], cache = create(null);
-		return {
-			get: function (args) {
-				var index = 0, set = map, i;
-				while (index < (length - 1)) {
-					i = indexOf.call(set[0], args[index]);
-					if (i === -1) return null;
-					set = set[1][i];
-					++index;
-				}
-				i = indexOf.call(set[0], args[index]);
-				if (i === -1) return null;
-				return set[1][i] || null;
-			},
-			set: function (args) {
-				var index = 0, set = map, i;
-				while (index < (length - 1)) {
-					i = indexOf.call(set[0], args[index]);
-					if (i === -1) {
-						i = set[0].push(args[index]) - 1;
-						set[1].push([[], []]);
-					}
-					set = set[1][i];
-					++index;
-				}
-				i = indexOf.call(set[0], args[index]);
-				if (i === -1) {
-					i = set[0].push(args[index]) - 1;
-				}
-				set[1][i] = ++lastId;
-				cache[lastId] = args;
-				return lastId;
-			},
-			delete: function (id) {
-				var index = 0, set = map, i, path = [], args = cache[id];
-				while (index < (length - 1)) {
-					i = indexOf.call(set[0], args[index]);
-					if (i === -1) {
-						return;
-					}
-					path.push(set, i);
-					set = set[1][i];
-					++index;
-				}
-				i = indexOf.call(set[0], args[index]);
-				if (i === -1) {
-					return;
-				}
-				id = set[1][i];
-				set[0].splice(i, 1);
-				set[1].splice(i, 1);
-				while (!set[0].length && path.length) {
-					i = path.pop();
-					set = path.pop();
-					set[0].splice(i, 1);
-					set[1].splice(i, 1);
-				}
-				delete cache[id];
-			},
-			clear: function () {
-				map = [[], []];
-				cache = create(null);
-			}
-		};
-	};
-
-
-/***/ },
-/* 116 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Support for asynchronous functions
-
-	'use strict';
-
-	var aFrom        = __webpack_require__(97)
-	  , mixin        = __webpack_require__(88)
-	  , defineLength = __webpack_require__(87)
-	  , nextTick     = __webpack_require__(117)
-
-	  , slice = Array.prototype.slice
-	  , apply = Function.prototype.apply, create = Object.create
-	  , hasOwnProperty = Object.prototype.hasOwnProperty;
-
-	__webpack_require__(78).async = function (tbi, conf) {
-		var waiting = create(null), cache = create(null)
-		  , base = conf.memoized, original = conf.original
-		  , currentCallback, currentContext, currentArgs;
-
-		// Initial
-		conf.memoized = defineLength(function (arg) {
-			var args = arguments, last = args[args.length - 1];
-			if (typeof last === 'function') {
-				currentCallback = last;
-				args = slice.call(args, 0, -1);
-			}
-			return base.apply(currentContext = this, currentArgs = args);
-		}, base);
-		try { mixin(conf.memoized, base); } catch (ignore) {}
-
-		// From cache (sync)
-		conf.on('get', function (id) {
-			var cb, context, args;
-			if (!currentCallback) return;
-
-			// Unresolved
-			if (waiting[id]) {
-				if (typeof waiting[id] === 'function') waiting[id] = [waiting[id], currentCallback];
-				else waiting[id].push(currentCallback);
-				currentCallback = null;
-				return;
-			}
-
-			// Resolved, assure next tick invocation
-			cb = currentCallback;
-			context = currentContext;
-			args = currentArgs;
-			currentCallback = currentContext = currentArgs = null;
-			nextTick(function () {
-				var data;
-				if (hasOwnProperty.call(cache, id)) {
-					data = cache[id];
-					conf.emit('getasync', id, args, context);
-					apply.call(cb, data.context, data.args);
-				} else {
-					// Purged in a meantime, we shouldn't rely on cached value, recall
-					currentCallback = cb;
-					currentContext = context;
-					currentArgs = args;
-					base.apply(context, args);
-				}
-			});
-		});
-
-		// Not from cache
-		conf.original = function () {
-			var args, cb, origCb, result;
-			if (!currentCallback) return apply.call(original, this, arguments);
-			args = aFrom(arguments);
-			cb = function self(err) {
-				var cb, args, id = self.id;
-				if (id == null) {
-					// Shouldn't happen, means async callback was called sync way
-					nextTick(apply.bind(self, this, arguments));
-					return;
-				}
-				delete self.id;
-				cb = waiting[id];
-				delete waiting[id];
-				if (!cb) {
-					// Already processed,
-					// outcome of race condition: asyncFn(1, cb), asyncFn.clear(), asyncFn(1, cb)
-					return;
-				}
-				args = aFrom(arguments);
-				if (conf.has(id)) {
-					if (err) {
-						conf.delete(id);
-					} else {
-						cache[id] = { context: this, args: args };
-						conf.emit('setasync', id, (typeof cb === 'function') ? 1 : cb.length);
-					}
-				}
-				if (typeof cb === 'function') {
-					result = apply.call(cb, this, args);
-				} else {
-					cb.forEach(function (cb) { result = apply.call(cb, this, args); }, this);
-				}
-				return result;
-			};
-			origCb = currentCallback;
-			currentCallback = currentContext = currentArgs = null;
-			args.push(cb);
-			result = apply.call(original, this, args);
-			cb.cb = origCb;
-			currentCallback = cb;
-			return result;
-		};
-
-		// After not from cache call
-		conf.on('set', function (id) {
-			if (!currentCallback) {
-				conf.delete(id);
-				return;
-			}
-			if (waiting[id]) {
-				// Race condition: asyncFn(1, cb), asyncFn.clear(), asyncFn(1, cb)
-				if (typeof waiting[id] === 'function') waiting[id] = [waiting[id], currentCallback.cb];
-				else waiting[id].push(currentCallback.cb);
-			} else {
-				waiting[id] = currentCallback.cb;
-			}
-			delete currentCallback.cb;
-			currentCallback.id = id;
-			currentCallback = null;
-		});
-
-		// On delete
-		conf.on('delete', function (id) {
-			var result;
-			// If false, we don't have value yet, so we assume that intention is not
-			// to memoize this call. After value is obtained we don't cache it but
-			// gracefully pass to callback
-			if (hasOwnProperty.call(waiting, id)) return;
-			if (!cache[id]) return;
-			result = cache[id];
-			delete cache[id];
-			conf.emit('deleteasync', id, result);
-		});
-
-		// On clear
-		conf.on('clear', function () {
-			var oldCache = cache;
-			cache = create(null);
-			conf.emit('clearasync', oldCache);
-		});
-	};
-
-
-/***/ },
-/* 117 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(process, setImmediate) {'use strict';
-
-	var callable, byObserver;
-
-	callable = function (fn) {
-		if (typeof fn !== 'function') throw new TypeError(fn + " is not a function");
-		return fn;
-	};
-
-	byObserver = function (Observer) {
-		var node = document.createTextNode(''), queue, i = 0;
-		new Observer(function () {
-			var data;
-			if (!queue) return;
-			data = queue;
-			queue = null;
-			if (typeof data === 'function') {
-				data();
-				return;
-			}
-			data.forEach(function (fn) { fn(); });
-		}).observe(node, { characterData: true });
-		return function (fn) {
-			callable(fn);
-			if (queue) {
-				if (typeof queue === 'function') queue = [queue, fn];
-				else queue.push(fn);
-				return;
-			}
-			queue = fn;
-			node.data = (i = ++i % 2);
-		};
-	};
-
-	module.exports = (function () {
-		// Node.js
-		if ((typeof process !== 'undefined') && process &&
-				(typeof process.nextTick === 'function')) {
-			return process.nextTick;
-		}
-
-		// MutationObserver=
-		if ((typeof document === 'object') && document) {
-			if (typeof MutationObserver === 'function') {
-				return byObserver(MutationObserver);
-			}
-			if (typeof WebKitMutationObserver === 'function') {
-				return byObserver(WebKitMutationObserver);
-			}
-		}
-
-		// W3C Draft
-		// http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/setImmediate/Overview.html
-		if (typeof setImmediate === 'function') {
-			return function (cb) { setImmediate(callable(cb)); };
-		}
-
-		// Wide available standard
-		if (typeof setTimeout === 'function') {
-			return function (cb) { setTimeout(callable(cb), 0); };
-		}
-
-		return null;
-	}());
-
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3), __webpack_require__(118).setImmediate))
-
-/***/ },
-/* 118 */
-/***/ function(module, exports, __webpack_require__) {
-
-	/* WEBPACK VAR INJECTION */(function(setImmediate, clearImmediate) {var nextTick = __webpack_require__(3).nextTick;
-	var apply = Function.prototype.apply;
-	var slice = Array.prototype.slice;
-	var immediateIds = {};
-	var nextImmediateId = 0;
-
-	// DOM APIs, for completeness
-
-	exports.setTimeout = function() {
-	  return new Timeout(apply.call(setTimeout, window, arguments), clearTimeout);
-	};
-	exports.setInterval = function() {
-	  return new Timeout(apply.call(setInterval, window, arguments), clearInterval);
-	};
-	exports.clearTimeout =
-	exports.clearInterval = function(timeout) { timeout.close(); };
-
-	function Timeout(id, clearFn) {
-	  this._id = id;
-	  this._clearFn = clearFn;
-	}
-	Timeout.prototype.unref = Timeout.prototype.ref = function() {};
-	Timeout.prototype.close = function() {
-	  this._clearFn.call(window, this._id);
-	};
-
-	// Does not start the time, just sets up the members needed.
-	exports.enroll = function(item, msecs) {
-	  clearTimeout(item._idleTimeoutId);
-	  item._idleTimeout = msecs;
-	};
-
-	exports.unenroll = function(item) {
-	  clearTimeout(item._idleTimeoutId);
-	  item._idleTimeout = -1;
-	};
-
-	exports._unrefActive = exports.active = function(item) {
-	  clearTimeout(item._idleTimeoutId);
-
-	  var msecs = item._idleTimeout;
-	  if (msecs >= 0) {
-	    item._idleTimeoutId = setTimeout(function onTimeout() {
-	      if (item._onTimeout)
-	        item._onTimeout();
-	    }, msecs);
-	  }
-	};
-
-	// That's not how node.js implements it but the exposed api is the same.
-	exports.setImmediate = typeof setImmediate === "function" ? setImmediate : function(fn) {
-	  var id = nextImmediateId++;
-	  var args = arguments.length < 2 ? false : slice.call(arguments, 1);
-
-	  immediateIds[id] = true;
-
-	  nextTick(function onNextTick() {
-	    if (immediateIds[id]) {
-	      // fn.call() is faster so we optimize for the common use-case
-	      // @see http://jsperf.com/call-apply-segu
-	      if (args) {
-	        fn.apply(null, args);
-	      } else {
-	        fn.call(null);
-	      }
-	      // Prevent ids from leaking
-	      exports.clearImmediate(id);
-	    }
-	  });
-
-	  return id;
-	};
-
-	exports.clearImmediate = typeof clearImmediate === "function" ? clearImmediate : function(id) {
-	  delete immediateIds[id];
-	};
-	/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(118).setImmediate, __webpack_require__(118).clearImmediate))
-
-/***/ },
-/* 119 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Call dispose callback on each cache purge
-
-	'use strict';
-
-	var callable   = __webpack_require__(74)
-	  , forEach    = __webpack_require__(75)
-	  , extensions = __webpack_require__(78)
-
-	  , slice = Array.prototype.slice, apply = Function.prototype.apply;
-
-	extensions.dispose = function (dispose, conf, options) {
-		var del;
-		callable(dispose);
-		if (options.async && extensions.async) {
-			conf.on('deleteasync', del = function (id, result) {
-				apply.call(dispose, null, slice.call(result.args, 1));
-			});
-			conf.on('clearasync', function (cache) {
-				forEach(cache, function (result, id) { del(id, result); });
-			});
-			return;
-		}
-		conf.on('delete', del = function (id, result) { dispose(result); });
-		conf.on('clear', function (cache) {
-			forEach(cache, function (result, id) { del(id, result); });
-		});
-	};
-
-
-/***/ },
-/* 120 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Timeout cached values
-
-	'use strict';
-
-	var aFrom      = __webpack_require__(97)
-	  , noop       = __webpack_require__(107)
-	  , forEach    = __webpack_require__(75)
-	  , timeout    = __webpack_require__(121)
-	  , extensions = __webpack_require__(78)
-
-	  , max = Math.max, min = Math.min, create = Object.create;
-
-	extensions.maxAge = function (maxAge, conf, options) {
-		var timeouts, postfix, preFetchAge, preFetchTimeouts;
-
-		maxAge = timeout(maxAge);
-		if (!maxAge) return;
-
-		timeouts = create(null);
-		postfix = (options.async && extensions.async) ? 'async' : '';
-		conf.on('set' + postfix, function (id) {
-			timeouts[id] = setTimeout(function () { conf.delete(id); }, maxAge);
-			if (!preFetchTimeouts) return;
-			if (preFetchTimeouts[id]) clearTimeout(preFetchTimeouts[id]);
-			preFetchTimeouts[id] = setTimeout(function () {
-				delete preFetchTimeouts[id];
-			}, preFetchAge);
-		});
-		conf.on('delete' + postfix, function (id) {
-			clearTimeout(timeouts[id]);
-			delete timeouts[id];
-			if (!preFetchTimeouts) return;
-			clearTimeout(preFetchTimeouts[id]);
-			delete preFetchTimeouts[id];
-		});
-
-		if (options.preFetch) {
-			if ((options.preFetch === true) || isNaN(options.preFetch)) {
-				preFetchAge = 0.333;
-			} else {
-				preFetchAge = max(min(Number(options.preFetch), 1), 0);
-			}
-			if (preFetchAge) {
-				preFetchTimeouts = {};
-				preFetchAge = (1 - preFetchAge) * maxAge;
-				conf.on('get' + postfix, function (id, args, context) {
-					if (!preFetchTimeouts[id]) {
-						preFetchTimeouts[id] =  setTimeout(function () {
-							delete preFetchTimeouts[id];
-							conf.delete(id);
-							if (options.async) {
-								args = aFrom(args);
-								args.push(noop);
-							}
-							conf.memoized.apply(context, args);
-						}, 0);
-					}
-				});
-			}
-		}
-
-		conf.on('clear' + postfix, function () {
-			forEach(timeouts, function (id) { clearTimeout(id); });
-			timeouts = {};
-			if (preFetchTimeouts) {
-				forEach(preFetchTimeouts, function (id) { clearTimeout(id); });
-				preFetchTimeouts = {};
-			}
-		});
-	};
-
-
-/***/ },
-/* 121 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toPosInt   = __webpack_require__(68)
-	  , maxTimeout = __webpack_require__(122);
-
-	module.exports = function (value) {
-		value = toPosInt(value);
-		if (value > maxTimeout) throw new TypeError(value + " exceeds maximum possible timeout");
-		return value;
-	};
-
-
-/***/ },
-/* 122 */
-/***/ function(module, exports) {
-
-	'use strict';
-
-	module.exports = 2147483647;
-
-
-/***/ },
-/* 123 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Limit cache size, LRU (least recently used) algorithm.
-
-	'use strict';
-
-	var toPosInteger = __webpack_require__(68)
-	  , lruQueue     = __webpack_require__(124)
-	  , extensions   = __webpack_require__(78);
-
-	extensions.max = function (max, conf, options) {
-		var postfix, queue, hit;
-
-		max = toPosInteger(max);
-		if (!max) return;
-
-		queue = lruQueue(max);
-		postfix = (options.async && extensions.async) ? 'async' : '';
-
-		conf.on('set' + postfix, hit = function (id) {
-			id = queue.hit(id);
-			if (id === undefined) return;
-			conf.delete(id);
-		});
-		conf.on('get' + postfix, hit);
-		conf.on('delete' + postfix, queue.delete);
-		conf.on('clear' + postfix, queue.clear);
-	};
-
-
-/***/ },
-/* 124 */
-/***/ function(module, exports, __webpack_require__) {
-
-	'use strict';
-
-	var toPosInt = __webpack_require__(68)
-
-	  , create = Object.create, hasOwnProperty = Object.prototype.hasOwnProperty;
-
-	module.exports = function (limit) {
-		var size = 0, base = 1, queue = create(null), map = create(null), index = 0, del;
-		limit = toPosInt(limit);
-		return {
-			hit: function (id) {
-				var oldIndex = map[id], nuIndex = ++index;
-				queue[nuIndex] = id;
-				map[id] = nuIndex;
-				if (!oldIndex) {
-					++size;
-					if (size <= limit) return;
-					id = queue[base];
-					del(id);
-					return id;
-				}
-				delete queue[oldIndex];
-				if (base !== oldIndex) return;
-				while (!hasOwnProperty.call(queue, ++base)) continue; //jslint: skip
-			},
-			delete: del = function (id) {
-				var oldIndex = map[id];
-				if (!oldIndex) return;
-				delete queue[oldIndex];
-				delete map[id];
-				--size;
-				if (base !== oldIndex) return;
-				if (!size) {
-					index = 0;
-					base = 1;
-					return;
-				}
-				while (!hasOwnProperty.call(queue, ++base)) continue; //jslint: skip
-			},
-			clear: function () {
-				size = 0;
-				base = 1;
-				queue = create(null);
-				map = create(null);
-				index = 0;
-			}
-		};
-	};
-
-
-/***/ },
-/* 125 */
-/***/ function(module, exports, __webpack_require__) {
-
-	// Reference counter, useful for garbage collector like functionality
-
-	'use strict';
-
-	var d          = __webpack_require__(89)
-	  , extensions = __webpack_require__(78)
-
-	  , create = Object.create, defineProperties = Object.defineProperties;
-
-	extensions.refCounter = function (ignore, conf, options) {
-		var cache, postfix;
-
-		cache = create(null);
-		postfix = (options.async && extensions.async) ? 'async' : '';
-
-		conf.on('set' + postfix, function (id, length) { cache[id] = length || 1; });
-		conf.on('get' + postfix, function (id) { ++cache[id]; });
-		conf.on('delete' + postfix, function (id) { delete cache[id]; });
-		conf.on('clear' + postfix, function () { cache = {}; });
-
-		defineProperties(conf.memoized, {
-			deleteRef: d(function () {
-				var id = conf.get(arguments);
-				if (id === null) return null;
-				if (!cache[id]) return null;
-				if (!--cache[id]) {
-					conf.delete(id);
-					return true;
-				}
-				return false;
-			}),
-			getRefCount: d(function () {
-				var id = conf.get(arguments);
-				if (id === null) return 0;
-				if (!cache[id]) return 0;
-				return cache[id];
-			})
-		});
-	};
-
-
-/***/ }
-/******/ ]);
\ No newline at end of file
diff --git a/vm.min.js b/vm.min.js
deleted file mode 100644
index d11a6ccad..000000000
--- a/vm.min.js
+++ /dev/null
@@ -1,11 +0,0 @@
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in s)for(var e;(e=this._stack[this._stack.length-1])in s[t];this.onclosetag(e));!this._options.xmlMode&&t in a||this._stack.push(t),this._cbs.onopentagname&&this._cbs.onopentagname(t),this._cbs.onopentag&&(this._attribs={})},n.prototype.onopentagend=function(){this._updatePosition(1),this._attribs&&(this._cbs.onopentag&&this._cbs.onopentag(this._tagname,this._attribs),this._attribs=null),!this._options.xmlMode&&this._cbs.onclosetag&&this._tagname in a&&this._cbs.onclosetag(this._tagname),this._tagname=""},n.prototype.onclosetag=function(t){if(this._updatePosition(1),this._lowerCaseTagNames&&(t=t.toLowerCase()),!this._stack.length||t in a&&!this._options.xmlMode)this._options.xmlMode||"br"!==t&&"p"!==t||(this.onopentagname(t),this._closeCurrentTag());else{var e=this._stack.lastIndexOf(t);if(-1!==e)if(this._cbs.onclosetag)for(e=this._stack.length-e;e--;)this._cbs.onclosetag(this._stack.pop());else this._stack.length=e;else"p"!==t||this._options.xmlMode||(this.onopentagname(t),this._closeCurrentTag())}},n.prototype.onselfclosingtag=function(){this._options.xmlMode||this._options.recognizeSelfClosing?this._closeCurrentTag():this.onopentagend()},n.prototype._closeCurrentTag=function(){var t=this._tagname;this.onopentagend(),this._stack[this._stack.length-1]===t&&(this._cbs.onclosetag&&this._cbs.onclosetag(t),this._stack.pop())},n.prototype.onattribname=function(t){this._lowerCaseAttributeNames&&(t=t.toLowerCase()),this._attribname=t},n.prototype.onattribdata=function(t){this._attribvalue+=t},n.prototype.onattribend=function(){this._cbs.onattribute&&this._cbs.onattribute(this._attribname,this._attribvalue),this._attribs&&!Object.prototype.hasOwnProperty.call(this._attribs,this._attribname)&&(this._attribs[this._attribname]=this._attribvalue),this._attribname="",this._attribvalue=""},n.prototype._getInstructionName=function(t){var e=t.search(c),r=0>e?t:t.substr(0,e);return this._lowerCaseTagNames&&(r=r.toLowerCase()),r},n.prototype.ondeclaration=function(t){if(this._cbs.onprocessinginstruction){var e=this._getInstructionName(t);this._cbs.onprocessinginstruction("!"+e,"!"+t)}},n.prototype.onprocessinginstruction=function(t){if(this._cbs.onprocessinginstruction){var e=this._getInstructionName(t);this._cbs.onprocessinginstruction("?"+e,"?"+t)}},n.prototype.oncomment=function(t){this._updatePosition(4),this._cbs.oncomment&&this._cbs.oncomment(t),this._cbs.oncommentend&&this._cbs.oncommentend()},n.prototype.oncdata=function(t){this._updatePosition(1),this._options.xmlMode||this._options.recognizeCDATA?(this._cbs.oncdatastart&&this._cbs.oncdatastart(),this._cbs.ontext&&this._cbs.ontext(t),this._cbs.oncdataend&&this._cbs.oncdataend()):this.oncomment("[CDATA["+t+"]]")},n.prototype.onerror=function(t){this._cbs.onerror&&this._cbs.onerror(t)},n.prototype.onend=function(){if(this._cbs.onclosetag)for(var t=this._stack.length;t>0;this._cbs.onclosetag(this._stack[--t]));this._cbs.onend&&this._cbs.onend()},n.prototype.reset=function(){this._cbs.onreset&&this._cbs.onreset(),this._tokenizer.reset(),this._tagname="",this._attribname="",this._attribs=null,this._stack=[],this._cbs.onparserinit&&this._cbs.onparserinit(this)},n.prototype.parseComplete=function(t){this.reset(),this.end(t)},n.prototype.write=function(t){this._tokenizer.write(t)},n.prototype.end=function(t){this._tokenizer.end(t)},n.prototype.pause=function(){this._tokenizer.pause()},n.prototype.resume=function(){this._tokenizer.resume()},n.prototype.parseChunk=n.prototype.write,n.prototype.done=n.prototype.end,t.exports=n},function(t,e,r){function n(t){return" "===t||"\n"===t||"	"===t||"\f"===t||"\r"===t}function i(t,e){return function(r){r===t&&(this._state=e)}}function o(t,e,r){var n=t.toLowerCase();return t===n?function(t){t===n?this._state=e:(this._state=r,this._index--)}:function(i){i===n||i===t?this._state=e:(this._state=r,this._index--)}}function s(t,e){var r=t.toLowerCase();return function(n){n===r||n===t?this._state=e:(this._state=g,this._index--)}}function a(t,e){this._state=p,this._buffer="",this._sectionStart=0,this._index=0,this._bufferOffset=0,this._baseState=p,this._special=gt,this._cbs=e,this._running=!0,this._ended=!1,this._xmlMode=!(!t||!t.xmlMode),this._decodeEntities=!(!t||!t.decodeEntities)}t.exports=a;var c=r(17),u=r(19),l=r(20),h=r(21),f=0,p=f++,d=f++,g=f++,_=f++,m=f++,b=f++,y=f++,v=f++,w=f++,S=f++,x=f++,E=f++,k=f++,T=f++,A=f++,L=f++,O=f++,C=f++,I=f++,B=f++,D=f++,N=f++,R=f++,q=f++,j=f++,P=f++,U=f++,M=f++,F=f++,z=f++,H=f++,V=f++,G=f++,Y=f++,W=f++,K=f++,J=f++,X=f++,Q=f++,Z=f++,$=f++,tt=f++,et=f++,rt=f++,nt=f++,it=f++,ot=f++,st=f++,at=f++,ct=f++,ut=f++,lt=f++,ht=f++,ft=f++,pt=f++,dt=0,gt=dt++,_t=dt++,mt=dt++;a.prototype._stateText=function(t){"<"===t?(this._index>this._sectionStart&&this._cbs.ontext(this._getSection()),this._state=d,this._sectionStart=this._index):this._decodeEntities&&this._special===gt&&"&"===t&&(this._index>this._sectionStart&&this._cbs.ontext(this._getSection()),this._baseState=p,this._state=ut,this._sectionStart=this._index)},a.prototype._stateBeforeTagName=function(t){"/"===t?this._state=m:">"===t||this._special!==gt||n(t)?this._state=p:"!"===t?(this._state=A,this._sectionStart=this._index+1):"?"===t?(this._state=O,this._sectionStart=this._index+1):"<"===t?(this._cbs.ontext(this._getSection()),this._sectionStart=this._index):(this._state=this._xmlMode||"s"!==t&&"S"!==t?g:H,this._sectionStart=this._index)},a.prototype._stateInTagName=function(t){("/"===t||">"===t||n(t))&&(this._emitToken("onopentagname"),this._state=v,this._index--)},a.prototype._stateBeforeCloseingTagName=function(t){n(t)||(">"===t?this._state=p:this._special!==gt?"s"===t||"S"===t?this._state=V:(this._state=p,this._index--):(this._state=b,this._sectionStart=this._index))},a.prototype._stateInCloseingTagName=function(t){(">"===t||n(t))&&(this._emitToken("onclosetag"),this._state=y,this._index--)},a.prototype._stateAfterCloseingTagName=function(t){">"===t&&(this._state=p,this._sectionStart=this._index+1)},a.prototype._stateBeforeAttributeName=function(t){">"===t?(this._cbs.onopentagend(),this._state=p,this._sectionStart=this._index+1):"/"===t?this._state=_:n(t)||(this._state=w,this._sectionStart=this._index)},a.prototype._stateInSelfClosingTag=function(t){">"===t?(this._cbs.onselfclosingtag(),this._state=p,this._sectionStart=this._index+1):n(t)||(this._state=v,this._index--)},a.prototype._stateInAttributeName=function(t){("="===t||"/"===t||">"===t||n(t))&&(this._cbs.onattribname(this._getSection()),this._sectionStart=-1,this._state=S,this._index--)},a.prototype._stateAfterAttributeName=function(t){"="===t?this._state=x:"/"===t||">"===t?(this._cbs.onattribend(),this._state=v,this._index--):n(t)||(this._cbs.onattribend(),this._state=w,this._sectionStart=this._index)},a.prototype._stateBeforeAttributeValue=function(t){'"'===t?(this._state=E,this._sectionStart=this._index+1):"'"===t?(this._state=k,this._sectionStart=this._index+1):n(t)||(this._state=T,this._sectionStart=this._index,
-this._index--)},a.prototype._stateInAttributeValueDoubleQuotes=function(t){'"'===t?(this._emitToken("onattribdata"),this._cbs.onattribend(),this._state=v):this._decodeEntities&&"&"===t&&(this._emitToken("onattribdata"),this._baseState=this._state,this._state=ut,this._sectionStart=this._index)},a.prototype._stateInAttributeValueSingleQuotes=function(t){"'"===t?(this._emitToken("onattribdata"),this._cbs.onattribend(),this._state=v):this._decodeEntities&&"&"===t&&(this._emitToken("onattribdata"),this._baseState=this._state,this._state=ut,this._sectionStart=this._index)},a.prototype._stateInAttributeValueNoQuotes=function(t){n(t)||">"===t?(this._emitToken("onattribdata"),this._cbs.onattribend(),this._state=v,this._index--):this._decodeEntities&&"&"===t&&(this._emitToken("onattribdata"),this._baseState=this._state,this._state=ut,this._sectionStart=this._index)},a.prototype._stateBeforeDeclaration=function(t){this._state="["===t?N:"-"===t?C:L},a.prototype._stateInDeclaration=function(t){">"===t&&(this._cbs.ondeclaration(this._getSection()),this._state=p,this._sectionStart=this._index+1)},a.prototype._stateInProcessingInstruction=function(t){">"===t&&(this._cbs.onprocessinginstruction(this._getSection()),this._state=p,this._sectionStart=this._index+1)},a.prototype._stateBeforeComment=function(t){"-"===t?(this._state=I,this._sectionStart=this._index+1):this._state=L},a.prototype._stateInComment=function(t){"-"===t&&(this._state=B)},a.prototype._stateAfterComment1=function(t){"-"===t?this._state=D:this._state=I},a.prototype._stateAfterComment2=function(t){">"===t?(this._cbs.oncomment(this._buffer.substring(this._sectionStart,this._index-2)),this._state=p,this._sectionStart=this._index+1):"-"!==t&&(this._state=I)},a.prototype._stateBeforeCdata1=o("C",R,L),a.prototype._stateBeforeCdata2=o("D",q,L),a.prototype._stateBeforeCdata3=o("A",j,L),a.prototype._stateBeforeCdata4=o("T",P,L),a.prototype._stateBeforeCdata5=o("A",U,L),a.prototype._stateBeforeCdata6=function(t){"["===t?(this._state=M,this._sectionStart=this._index+1):(this._state=L,this._index--)},a.prototype._stateInCdata=function(t){"]"===t&&(this._state=F)},a.prototype._stateAfterCdata1=i("]",z),a.prototype._stateAfterCdata2=function(t){">"===t?(this._cbs.oncdata(this._buffer.substring(this._sectionStart,this._index-2)),this._state=p,this._sectionStart=this._index+1):"]"!==t&&(this._state=M)},a.prototype._stateBeforeSpecial=function(t){"c"===t||"C"===t?this._state=G:"t"===t||"T"===t?this._state=et:(this._state=g,this._index--)},a.prototype._stateBeforeSpecialEnd=function(t){this._special!==_t||"c"!==t&&"C"!==t?this._special!==mt||"t"!==t&&"T"!==t?this._state=p:this._state=ot:this._state=X},a.prototype._stateBeforeScript1=s("R",Y),a.prototype._stateBeforeScript2=s("I",W),a.prototype._stateBeforeScript3=s("P",K),a.prototype._stateBeforeScript4=s("T",J),a.prototype._stateBeforeScript5=function(t){("/"===t||">"===t||n(t))&&(this._special=_t),this._state=g,this._index--},a.prototype._stateAfterScript1=o("R",Q,p),a.prototype._stateAfterScript2=o("I",Z,p),a.prototype._stateAfterScript3=o("P",$,p),a.prototype._stateAfterScript4=o("T",tt,p),a.prototype._stateAfterScript5=function(t){">"===t||n(t)?(this._special=gt,this._state=b,this._sectionStart=this._index-6,this._index--):this._state=p},a.prototype._stateBeforeStyle1=s("Y",rt),a.prototype._stateBeforeStyle2=s("L",nt),a.prototype._stateBeforeStyle3=s("E",it),a.prototype._stateBeforeStyle4=function(t){("/"===t||">"===t||n(t))&&(this._special=mt),this._state=g,this._index--},a.prototype._stateAfterStyle1=o("Y",st,p),a.prototype._stateAfterStyle2=o("L",at,p),a.prototype._stateAfterStyle3=o("E",ct,p),a.prototype._stateAfterStyle4=function(t){">"===t||n(t)?(this._special=gt,this._state=b,this._sectionStart=this._index-5,this._index--):this._state=p},a.prototype._stateBeforeEntity=o("#",lt,ht),a.prototype._stateBeforeNumericEntity=o("X",pt,ft),a.prototype._parseNamedEntityStrict=function(){if(this._sectionStart+1<this._index){var t=this._buffer.substring(this._sectionStart+1,this._index),e=this._xmlMode?h:u;e.hasOwnProperty(t)&&(this._emitPartial(e[t]),this._sectionStart=this._index+1)}},a.prototype._parseLegacyEntity=function(){var t=this._sectionStart+1,e=this._index-t;for(e>6&&(e=6);e>=2;){var r=this._buffer.substr(t,e);if(l.hasOwnProperty(r))return this._emitPartial(l[r]),void(this._sectionStart+=e+1);e--}},a.prototype._stateInNamedEntity=function(t){";"===t?(this._parseNamedEntityStrict(),this._sectionStart+1<this._index&&!this._xmlMode&&this._parseLegacyEntity(),this._state=this._baseState):("a">t||t>"z")&&("A">t||t>"Z")&&("0">t||t>"9")&&(this._xmlMode||this._sectionStart+1===this._index||(this._baseState!==p?"="!==t&&this._parseNamedEntityStrict():this._parseLegacyEntity()),this._state=this._baseState,this._index--)},a.prototype._decodeNumericEntity=function(t,e){var r=this._sectionStart+t;if(r!==this._index){var n=this._buffer.substring(r,this._index),i=parseInt(n,e);this._emitPartial(c(i)),this._sectionStart=this._index}else this._sectionStart--;this._state=this._baseState},a.prototype._stateInNumericEntity=function(t){";"===t?(this._decodeNumericEntity(2,10),this._sectionStart++):("0">t||t>"9")&&(this._xmlMode?this._state=this._baseState:this._decodeNumericEntity(2,10),this._index--)},a.prototype._stateInHexEntity=function(t){";"===t?(this._decodeNumericEntity(3,16),this._sectionStart++):("a">t||t>"f")&&("A">t||t>"F")&&("0">t||t>"9")&&(this._xmlMode?this._state=this._baseState:this._decodeNumericEntity(3,16),this._index--)},a.prototype._cleanup=function(){this._sectionStart<0?(this._buffer="",this._index=0,this._bufferOffset+=this._index):this._running&&(this._state===p?(this._sectionStart!==this._index&&this._cbs.ontext(this._buffer.substr(this._sectionStart)),this._buffer="",this._index=0,this._bufferOffset+=this._index):this._sectionStart===this._index?(this._buffer="",this._index=0,this._bufferOffset+=this._index):(this._buffer=this._buffer.substr(this._sectionStart),this._index-=this._sectionStart,this._bufferOffset+=this._sectionStart),this._sectionStart=0)},a.prototype.write=function(t){this._ended&&this._cbs.onerror(Error(".write() after done!")),this._buffer+=t,this._parse()},a.prototype._parse=function(){for(;this._index<this._buffer.length&&this._running;){var t=this._buffer.charAt(this._index);this._state===p?this._stateText(t):this._state===d?this._stateBeforeTagName(t):this._state===g?this._stateInTagName(t):this._state===m?this._stateBeforeCloseingTagName(t):this._state===b?this._stateInCloseingTagName(t):this._state===y?this._stateAfterCloseingTagName(t):this._state===_?this._stateInSelfClosingTag(t):this._state===v?this._stateBeforeAttributeName(t):this._state===w?this._stateInAttributeName(t):this._state===S?this._stateAfterAttributeName(t):this._state===x?this._stateBeforeAttributeValue(t):this._state===E?this._stateInAttributeValueDoubleQuotes(t):this._state===k?this._stateInAttributeValueSingleQuotes(t):this._state===T?this._stateInAttributeValueNoQuotes(t):this._state===A?this._stateBeforeDeclaration(t):this._state===L?this._stateInDeclaration(t):this._state===O?this._stateInProcessingInstruction(t):this._state===C?this._stateBeforeComment(t):this._state===I?this._stateInComment(t):this._state===B?this._stateAfterComment1(t):this._state===D?this._stateAfterComment2(t):this._state===N?this._stateBeforeCdata1(t):this._state===R?this._stateBeforeCdata2(t):this._state===q?this._stateBeforeCdata3(t):this._state===j?this._stateBeforeCdata4(t):this._state===P?this._stateBeforeCdata5(t):this._state===U?this._stateBeforeCdata6(t):this._state===M?this._stateInCdata(t):this._state===F?this._stateAfterCdata1(t):this._state===z?this._stateAfterCdata2(t):this._state===H?this._stateBeforeSpecial(t):this._state===V?this._stateBeforeSpecialEnd(t):this._state===G?this._stateBeforeScript1(t):this._state===Y?this._stateBeforeScript2(t):this._state===W?this._stateBeforeScript3(t):this._state===K?this._stateBeforeScript4(t):this._state===J?this._stateBeforeScript5(t):this._state===X?this._stateAfterScript1(t):this._state===Q?this._stateAfterScript2(t):this._state===Z?this._stateAfterScript3(t):this._state===$?this._stateAfterScript4(t):this._state===tt?this._stateAfterScript5(t):this._state===et?this._stateBeforeStyle1(t):this._state===rt?this._stateBeforeStyle2(t):this._state===nt?this._stateBeforeStyle3(t):this._state===it?this._stateBeforeStyle4(t):this._state===ot?this._stateAfterStyle1(t):this._state===st?this._stateAfterStyle2(t):this._state===at?this._stateAfterStyle3(t):this._state===ct?this._stateAfterStyle4(t):this._state===ut?this._stateBeforeEntity(t):this._state===lt?this._stateBeforeNumericEntity(t):this._state===ht?this._stateInNamedEntity(t):this._state===ft?this._stateInNumericEntity(t):this._state===pt?this._stateInHexEntity(t):this._cbs.onerror(Error("unknown _state"),this._state),this._index++}this._cleanup()},a.prototype.pause=function(){this._running=!1},a.prototype.resume=function(){this._running=!0,this._index<this._buffer.length&&this._parse(),this._ended&&this._finish()},a.prototype.end=function(t){this._ended&&this._cbs.onerror(Error(".end() after done!")),t&&this.write(t),this._ended=!0,this._running&&this._finish()},a.prototype._finish=function(){this._sectionStart<this._index&&this._handleTrailingData(),this._cbs.onend()},a.prototype._handleTrailingData=function(){var t=this._buffer.substr(this._sectionStart);this._state===M||this._state===F||this._state===z?this._cbs.oncdata(t):this._state===I||this._state===B||this._state===D?this._cbs.oncomment(t):this._state!==ht||this._xmlMode?this._state!==ft||this._xmlMode?this._state!==pt||this._xmlMode?this._state!==g&&this._state!==v&&this._state!==x&&this._state!==S&&this._state!==w&&this._state!==k&&this._state!==E&&this._state!==T&&this._state!==b&&this._cbs.ontext(t):(this._decodeNumericEntity(3,16),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData())):(this._decodeNumericEntity(2,10),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData())):(this._parseLegacyEntity(),this._sectionStart<this._index&&(this._state=this._baseState,this._handleTrailingData()))},a.prototype.reset=function(){a.call(this,{xmlMode:this._xmlMode,decodeEntities:this._decodeEntities},this._cbs)},a.prototype.getAbsoluteIndex=function(){return this._bufferOffset+this._index},a.prototype._getSection=function(){return this._buffer.substring(this._sectionStart,this._index)},a.prototype._emitToken=function(t){this._cbs[t](this._getSection()),this._sectionStart=-1},a.prototype._emitPartial=function(t){this._baseState!==p?this._cbs.onattribdata(t):this._cbs.ontext(t)}},function(t,e,r){function n(t){if(t>=55296&&57343>=t||t>1114111)return"�";t in i&&(t=i[t]);var e="";return t>65535&&(t-=65536,e+=String.fromCharCode(t>>>10&1023|55296),t=56320|1023&t),e+=String.fromCharCode(t)}var i=r(18);t.exports=n},function(t,e){t.exports={0:65533,128:8364,130:8218,131:402,132:8222,133:8230,134:8224,135:8225,136:710,137:8240,138:352,139:8249,140:338,142:381,145:8216,146:8217,147:8220,148:8221,149:8226,150:8211,151:8212,152:732,153:8482,154:353,155:8250,156:339,158:382,159:376}},function(t,e){t.exports={Aacute:"Á",aacute:"á",Abreve:"Ă",abreve:"ă",ac:"∾",acd:"∿",acE:"∾̳",Acirc:"Â",acirc:"â",acute:"´",Acy:"А",acy:"а",AElig:"Æ",aelig:"æ",af:"⁡",Afr:"𝔄",afr:"𝔞",Agrave:"À",agrave:"à",alefsym:"ℵ",aleph:"ℵ",Alpha:"Α",alpha:"α",Amacr:"Ā",amacr:"ā",amalg:"⨿",amp:"&",AMP:"&",andand:"⩕",And:"⩓",and:"∧",andd:"⩜",andslope:"⩘",andv:"⩚",ang:"∠",ange:"⦤",angle:"∠",angmsdaa:"⦨",angmsdab:"⦩",angmsdac:"⦪",angmsdad:"⦫",angmsdae:"⦬",angmsdaf:"⦭",angmsdag:"⦮",angmsdah:"⦯",angmsd:"∡",angrt:"∟",angrtvb:"⊾",angrtvbd:"⦝",angsph:"∢",angst:"Å",angzarr:"⍼",Aogon:"Ą",aogon:"ą",Aopf:"𝔸",aopf:"𝕒",apacir:"⩯",ap:"≈",apE:"⩰",ape:"≊",apid:"≋",apos:"'",ApplyFunction:"⁡",approx:"≈",approxeq:"≊",Aring:"Å",aring:"å",Ascr:"𝒜",ascr:"𝒶",Assign:"≔",ast:"*",asymp:"≈",asympeq:"≍",Atilde:"Ã",atilde:"ã",Auml:"Ä",auml:"ä",awconint:"∳",awint:"⨑",backcong:"≌",backepsilon:"϶",backprime:"‵",backsim:"∽",backsimeq:"⋍",Backslash:"∖",Barv:"⫧",barvee:"⊽",barwed:"⌅",Barwed:"⌆",barwedge:"⌅",bbrk:"⎵",bbrktbrk:"⎶",bcong:"≌",Bcy:"Б",bcy:"б",bdquo:"„",becaus:"∵",because:"∵",Because:"∵",bemptyv:"⦰",bepsi:"϶",bernou:"ℬ",Bernoullis:"ℬ",Beta:"Β",beta:"β",beth:"ℶ",between:"≬",Bfr:"𝔅",bfr:"𝔟",bigcap:"⋂",bigcirc:"◯",bigcup:"⋃",bigodot:"⨀",bigoplus:"⨁",bigotimes:"⨂",bigsqcup:"⨆",bigstar:"★",bigtriangledown:"▽",bigtriangleup:"△",biguplus:"⨄",bigvee:"⋁",bigwedge:"⋀",bkarow:"⤍",blacklozenge:"⧫",blacksquare:"▪",blacktriangle:"▴",blacktriangledown:"▾",blacktriangleleft:"◂",blacktriangleright:"▸",blank:"␣",blk12:"▒",blk14:"░",blk34:"▓",block:"█",bne:"=⃥",bnequiv:"≡⃥",bNot:"⫭",bnot:"⌐",Bopf:"𝔹",bopf:"𝕓",bot:"⊥",bottom:"⊥",bowtie:"⋈",boxbox:"⧉",boxdl:"┐",boxdL:"╕",boxDl:"╖",boxDL:"╗",boxdr:"┌",boxdR:"╒",boxDr:"╓",boxDR:"╔",boxh:"─",boxH:"═",boxhd:"┬",boxHd:"╤",boxhD:"╥",boxHD:"╦",boxhu:"┴",boxHu:"╧",boxhU:"╨",boxHU:"╩",boxminus:"⊟",boxplus:"⊞",boxtimes:"⊠",boxul:"┘",boxuL:"╛",boxUl:"╜",boxUL:"╝",boxur:"└",boxuR:"╘",boxUr:"╙",boxUR:"╚",boxv:"│",boxV:"║",boxvh:"┼",boxvH:"╪",boxVh:"╫",boxVH:"╬",boxvl:"┤",boxvL:"╡",boxVl:"╢",boxVL:"╣",boxvr:"├",boxvR:"╞",boxVr:"╟",boxVR:"╠",bprime:"‵",breve:"˘",Breve:"˘",brvbar:"¦",bscr:"𝒷",Bscr:"ℬ",bsemi:"⁏",bsim:"∽",bsime:"⋍",bsolb:"⧅",bsol:"\\",bsolhsub:"⟈",bull:"•",bullet:"•",bump:"≎",bumpE:"⪮",bumpe:"≏",Bumpeq:"≎",bumpeq:"≏",Cacute:"Ć",cacute:"ć",capand:"⩄",capbrcup:"⩉",capcap:"⩋",cap:"∩",Cap:"⋒",capcup:"⩇",capdot:"⩀",CapitalDifferentialD:"ⅅ",caps:"∩︀",caret:"⁁",caron:"ˇ",Cayleys:"ℭ",ccaps:"⩍",Ccaron:"Č",ccaron:"č",Ccedil:"Ç",ccedil:"ç",Ccirc:"Ĉ",ccirc:"ĉ",Cconint:"∰",ccups:"⩌",ccupssm:"⩐",Cdot:"Ċ",cdot:"ċ",cedil:"¸",Cedilla:"¸",cemptyv:"⦲",cent:"¢",centerdot:"·",CenterDot:"·",cfr:"𝔠",Cfr:"ℭ",CHcy:"Ч",chcy:"ч",check:"✓",checkmark:"✓",Chi:"Χ",chi:"χ",circ:"ˆ",circeq:"≗",circlearrowleft:"↺",circlearrowright:"↻",circledast:"⊛",circledcirc:"⊚",circleddash:"⊝",CircleDot:"⊙",circledR:"®",circledS:"Ⓢ",CircleMinus:"⊖",CirclePlus:"⊕",CircleTimes:"⊗",cir:"○",cirE:"⧃",cire:"≗",cirfnint:"⨐",cirmid:"⫯",cirscir:"⧂",ClockwiseContourIntegral:"∲",CloseCurlyDoubleQuote:"”",CloseCurlyQuote:"’",clubs:"♣",clubsuit:"♣",colon:":",Colon:"∷",Colone:"⩴",colone:"≔",coloneq:"≔",comma:",",commat:"@",comp:"∁",compfn:"∘",complement:"∁",complexes:"ℂ",cong:"≅",congdot:"⩭",Congruent:"≡",conint:"∮",Conint:"∯",ContourIntegral:"∮",copf:"𝕔",Copf:"ℂ",coprod:"∐",Coproduct:"∐",copy:"©",COPY:"©",copysr:"℗",CounterClockwiseContourIntegral:"∳",crarr:"↵",cross:"✗",Cross:"⨯",Cscr:"𝒞",cscr:"𝒸",csub:"⫏",csube:"⫑",csup:"⫐",csupe:"⫒",ctdot:"⋯",cudarrl:"⤸",cudarrr:"⤵",cuepr:"⋞",cuesc:"⋟",cularr:"↶",cularrp:"⤽",cupbrcap:"⩈",cupcap:"⩆",CupCap:"≍",cup:"∪",Cup:"⋓",cupcup:"⩊",cupdot:"⊍",cupor:"⩅",cups:"∪︀",curarr:"↷",curarrm:"⤼",curlyeqprec:"⋞",curlyeqsucc:"⋟",curlyvee:"⋎",curlywedge:"⋏",curren:"¤",curvearrowleft:"↶",curvearrowright:"↷",cuvee:"⋎",cuwed:"⋏",cwconint:"∲",cwint:"∱",cylcty:"⌭",dagger:"†",Dagger:"‡",daleth:"ℸ",darr:"↓",Darr:"↡",dArr:"⇓",dash:"‐",Dashv:"⫤",dashv:"⊣",dbkarow:"⤏",dblac:"˝",Dcaron:"Ď",dcaron:"ď",Dcy:"Д",dcy:"д",ddagger:"‡",ddarr:"⇊",DD:"ⅅ",dd:"ⅆ",DDotrahd:"⤑",ddotseq:"⩷",deg:"°",Del:"∇",Delta:"Δ",delta:"δ",demptyv:"⦱",dfisht:"⥿",Dfr:"𝔇",dfr:"𝔡",dHar:"⥥",dharl:"⇃",dharr:"⇂",DiacriticalAcute:"´",DiacriticalDot:"˙",DiacriticalDoubleAcute:"˝",DiacriticalGrave:"`",DiacriticalTilde:"˜",diam:"⋄",diamond:"⋄",Diamond:"⋄",diamondsuit:"♦",diams:"♦",die:"¨",DifferentialD:"ⅆ",digamma:"ϝ",disin:"⋲",div:"÷",divide:"÷",divideontimes:"⋇",divonx:"⋇",DJcy:"Ђ",djcy:"ђ",dlcorn:"⌞",dlcrop:"⌍",dollar:"$",Dopf:"𝔻",dopf:"𝕕",Dot:"¨",dot:"˙",DotDot:"⃜",doteq:"≐",doteqdot:"≑",DotEqual:"≐",dotminus:"∸",dotplus:"∔",dotsquare:"⊡",doublebarwedge:"⌆",DoubleContourIntegral:"∯",DoubleDot:"¨",DoubleDownArrow:"⇓",DoubleLeftArrow:"⇐",DoubleLeftRightArrow:"⇔",DoubleLeftTee:"⫤",DoubleLongLeftArrow:"⟸",DoubleLongLeftRightArrow:"⟺",DoubleLongRightArrow:"⟹",DoubleRightArrow:"⇒",DoubleRightTee:"⊨",DoubleUpArrow:"⇑",DoubleUpDownArrow:"⇕",DoubleVerticalBar:"∥",DownArrowBar:"⤓",downarrow:"↓",DownArrow:"↓",Downarrow:"⇓",DownArrowUpArrow:"⇵",DownBreve:"̑",downdownarrows:"⇊",downharpoonleft:"⇃",downharpoonright:"⇂",DownLeftRightVector:"⥐",DownLeftTeeVector:"⥞",DownLeftVectorBar:"⥖",DownLeftVector:"↽",DownRightTeeVector:"⥟",DownRightVectorBar:"⥗",DownRightVector:"⇁",DownTeeArrow:"↧",DownTee:"⊤",drbkarow:"⤐",drcorn:"⌟",drcrop:"⌌",Dscr:"𝒟",dscr:"𝒹",DScy:"Ѕ",dscy:"ѕ",dsol:"⧶",Dstrok:"Đ",dstrok:"đ",dtdot:"⋱",dtri:"▿",dtrif:"▾",duarr:"⇵",duhar:"⥯",dwangle:"⦦",DZcy:"Џ",dzcy:"џ",dzigrarr:"⟿",Eacute:"É",eacute:"é",easter:"⩮",Ecaron:"Ě",ecaron:"ě",Ecirc:"Ê",ecirc:"ê",ecir:"≖",ecolon:"≕",Ecy:"Э",ecy:"э",eDDot:"⩷",Edot:"Ė",edot:"ė",eDot:"≑",ee:"ⅇ",efDot:"≒",Efr:"𝔈",efr:"𝔢",eg:"⪚",Egrave:"È",egrave:"è",egs:"⪖",egsdot:"⪘",el:"⪙",Element:"∈",elinters:"⏧",ell:"ℓ",els:"⪕",elsdot:"⪗",Emacr:"Ē",emacr:"ē",empty:"∅",emptyset:"∅",EmptySmallSquare:"◻",emptyv:"∅",EmptyVerySmallSquare:"▫",emsp13:" ",emsp14:" ",emsp:" ",ENG:"Ŋ",eng:"ŋ",ensp:" ",Eogon:"Ę",eogon:"ę",Eopf:"𝔼",eopf:"𝕖",epar:"⋕",eparsl:"⧣",eplus:"⩱",epsi:"ε",Epsilon:"Ε",epsilon:"ε",epsiv:"ϵ",eqcirc:"≖",eqcolon:"≕",eqsim:"≂",eqslantgtr:"⪖",eqslantless:"⪕",Equal:"⩵",equals:"=",EqualTilde:"≂",equest:"≟",Equilibrium:"⇌",equiv:"≡",equivDD:"⩸",eqvparsl:"⧥",erarr:"⥱",erDot:"≓",escr:"ℯ",Escr:"ℰ",esdot:"≐",Esim:"⩳",esim:"≂",Eta:"Η",eta:"η",ETH:"Ð",eth:"ð",Euml:"Ë",euml:"ë",euro:"€",excl:"!",exist:"∃",Exists:"∃",expectation:"ℰ",exponentiale:"ⅇ",ExponentialE:"ⅇ",fallingdotseq:"≒",Fcy:"Ф",fcy:"ф",female:"♀",ffilig:"ffi",fflig:"ff",ffllig:"ffl",Ffr:"𝔉",ffr:"𝔣",filig:"fi",FilledSmallSquare:"◼",FilledVerySmallSquare:"▪",fjlig:"fj",flat:"♭",fllig:"fl",fltns:"▱",fnof:"ƒ",Fopf:"𝔽",fopf:"𝕗",forall:"∀",ForAll:"∀",fork:"⋔",forkv:"⫙",Fouriertrf:"ℱ",fpartint:"⨍",frac12:"½",frac13:"⅓",frac14:"¼",frac15:"⅕",frac16:"⅙",frac18:"⅛",frac23:"⅔",frac25:"⅖",frac34:"¾",frac35:"⅗",frac38:"⅜",frac45:"⅘",frac56:"⅚",frac58:"⅝",frac78:"⅞",frasl:"⁄",frown:"⌢",fscr:"𝒻",Fscr:"ℱ",gacute:"ǵ",Gamma:"Γ",gamma:"γ",Gammad:"Ϝ",gammad:"ϝ",gap:"⪆",Gbreve:"Ğ",gbreve:"ğ",Gcedil:"Ģ",Gcirc:"Ĝ",gcirc:"ĝ",Gcy:"Г",gcy:"г",Gdot:"Ġ",gdot:"ġ",ge:"≥",gE:"≧",gEl:"⪌",gel:"⋛",geq:"≥",geqq:"≧",geqslant:"⩾",gescc:"⪩",ges:"⩾",gesdot:"⪀",gesdoto:"⪂",gesdotol:"⪄",gesl:"⋛︀",gesles:"⪔",Gfr:"𝔊",gfr:"𝔤",gg:"≫",Gg:"⋙",ggg:"⋙",gimel:"ℷ",GJcy:"Ѓ",gjcy:"ѓ",gla:"⪥",gl:"≷",glE:"⪒",glj:"⪤",gnap:"⪊",gnapprox:"⪊",gne:"⪈",gnE:"≩",gneq:"⪈",gneqq:"≩",gnsim:"⋧",Gopf:"𝔾",gopf:"𝕘",grave:"`",GreaterEqual:"≥",GreaterEqualLess:"⋛",GreaterFullEqual:"≧",GreaterGreater:"⪢",GreaterLess:"≷",GreaterSlantEqual:"⩾",GreaterTilde:"≳",Gscr:"𝒢",gscr:"ℊ",gsim:"≳",gsime:"⪎",gsiml:"⪐",gtcc:"⪧",gtcir:"⩺",gt:">",GT:">",Gt:"≫",gtdot:"⋗",gtlPar:"⦕",gtquest:"⩼",gtrapprox:"⪆",gtrarr:"⥸",gtrdot:"⋗",gtreqless:"⋛",gtreqqless:"⪌",gtrless:"≷",gtrsim:"≳",gvertneqq:"≩︀",gvnE:"≩︀",Hacek:"ˇ",hairsp:" ",half:"½",hamilt:"ℋ",HARDcy:"Ъ",hardcy:"ъ",harrcir:"⥈",harr:"↔",hArr:"⇔",harrw:"↭",Hat:"^",hbar:"ℏ",Hcirc:"Ĥ",hcirc:"ĥ",hearts:"♥",heartsuit:"♥",hellip:"…",hercon:"⊹",hfr:"𝔥",Hfr:"ℌ",HilbertSpace:"ℋ",hksearow:"⤥",hkswarow:"⤦",hoarr:"⇿",homtht:"∻",hookleftarrow:"↩",hookrightarrow:"↪",hopf:"𝕙",Hopf:"ℍ",horbar:"―",HorizontalLine:"─",hscr:"𝒽",Hscr:"ℋ",hslash:"ℏ",Hstrok:"Ħ",hstrok:"ħ",HumpDownHump:"≎",HumpEqual:"≏",hybull:"⁃",hyphen:"‐",Iacute:"Í",iacute:"í",ic:"⁣",Icirc:"Î",icirc:"î",Icy:"И",icy:"и",Idot:"İ",IEcy:"Е",iecy:"е",iexcl:"¡",iff:"⇔",ifr:"𝔦",Ifr:"ℑ",Igrave:"Ì",igrave:"ì",ii:"ⅈ",iiiint:"⨌",iiint:"∭",iinfin:"⧜",iiota:"℩",IJlig:"IJ",ijlig:"ij",Imacr:"Ī",imacr:"ī",image:"ℑ",ImaginaryI:"ⅈ",imagline:"ℐ",imagpart:"ℑ",imath:"ı",Im:"ℑ",imof:"⊷",imped:"Ƶ",Implies:"⇒",incare:"℅","in":"∈",infin:"∞",infintie:"⧝",inodot:"ı",intcal:"⊺","int":"∫",Int:"∬",integers:"ℤ",Integral:"∫",intercal:"⊺",Intersection:"⋂",intlarhk:"⨗",intprod:"⨼",InvisibleComma:"⁣",InvisibleTimes:"⁢",IOcy:"Ё",iocy:"ё",Iogon:"Į",iogon:"į",Iopf:"𝕀",iopf:"𝕚",Iota:"Ι",iota:"ι",iprod:"⨼",iquest:"¿",iscr:"𝒾",Iscr:"ℐ",isin:"∈",isindot:"⋵",isinE:"⋹",isins:"⋴",isinsv:"⋳",isinv:"∈",it:"⁢",Itilde:"Ĩ",itilde:"ĩ",Iukcy:"І",iukcy:"і",Iuml:"Ï",iuml:"ï",Jcirc:"Ĵ",jcirc:"ĵ",Jcy:"Й",jcy:"й",Jfr:"𝔍",jfr:"𝔧",jmath:"ȷ",Jopf:"𝕁",jopf:"𝕛",Jscr:"𝒥",jscr:"𝒿",Jsercy:"Ј",jsercy:"ј",Jukcy:"Є",jukcy:"є",Kappa:"Κ",kappa:"κ",kappav:"ϰ",Kcedil:"Ķ",kcedil:"ķ",Kcy:"К",kcy:"к",Kfr:"𝔎",kfr:"𝔨",kgreen:"ĸ",KHcy:"Х",khcy:"х",KJcy:"Ќ",kjcy:"ќ",Kopf:"𝕂",kopf:"𝕜",Kscr:"𝒦",kscr:"𝓀",lAarr:"⇚",Lacute:"Ĺ",lacute:"ĺ",laemptyv:"⦴",lagran:"ℒ",Lambda:"Λ",lambda:"λ",lang:"⟨",Lang:"⟪",langd:"⦑",langle:"⟨",lap:"⪅",Laplacetrf:"ℒ",laquo:"«",larrb:"⇤",larrbfs:"⤟",larr:"←",Larr:"↞",lArr:"⇐",larrfs:"⤝",larrhk:"↩",larrlp:"↫",larrpl:"⤹",larrsim:"⥳",larrtl:"↢",latail:"⤙",lAtail:"⤛",lat:"⪫",late:"⪭",lates:"⪭︀",lbarr:"⤌",lBarr:"⤎",lbbrk:"❲",lbrace:"{",lbrack:"[",lbrke:"⦋",lbrksld:"⦏",lbrkslu:"⦍",Lcaron:"Ľ",lcaron:"ľ",Lcedil:"Ļ",lcedil:"ļ",lceil:"⌈",lcub:"{",Lcy:"Л",lcy:"л",ldca:"⤶",ldquo:"“",ldquor:"„",ldrdhar:"⥧",ldrushar:"⥋",ldsh:"↲",le:"≤",lE:"≦",LeftAngleBracket:"⟨",LeftArrowBar:"⇤",leftarrow:"←",LeftArrow:"←",Leftarrow:"⇐",LeftArrowRightArrow:"⇆",leftarrowtail:"↢",LeftCeiling:"⌈",LeftDoubleBracket:"⟦",LeftDownTeeVector:"⥡",LeftDownVectorBar:"⥙",LeftDownVector:"⇃",LeftFloor:"⌊",leftharpoondown:"↽",leftharpoonup:"↼",leftleftarrows:"⇇",leftrightarrow:"↔",LeftRightArrow:"↔",Leftrightarrow:"⇔",leftrightarrows:"⇆",leftrightharpoons:"⇋",leftrightsquigarrow:"↭",LeftRightVector:"⥎",LeftTeeArrow:"↤",LeftTee:"⊣",LeftTeeVector:"⥚",leftthreetimes:"⋋",LeftTriangleBar:"⧏",LeftTriangle:"⊲",LeftTriangleEqual:"⊴",LeftUpDownVector:"⥑",LeftUpTeeVector:"⥠",LeftUpVectorBar:"⥘",LeftUpVector:"↿",LeftVectorBar:"⥒",LeftVector:"↼",lEg:"⪋",leg:"⋚",leq:"≤",leqq:"≦",leqslant:"⩽",lescc:"⪨",les:"⩽",lesdot:"⩿",lesdoto:"⪁",lesdotor:"⪃",lesg:"⋚︀",lesges:"⪓",lessapprox:"⪅",lessdot:"⋖",lesseqgtr:"⋚",lesseqqgtr:"⪋",LessEqualGreater:"⋚",LessFullEqual:"≦",LessGreater:"≶",lessgtr:"≶",LessLess:"⪡",lesssim:"≲",LessSlantEqual:"⩽",LessTilde:"≲",lfisht:"⥼",lfloor:"⌊",Lfr:"𝔏",lfr:"𝔩",lg:"≶",lgE:"⪑",lHar:"⥢",lhard:"↽",lharu:"↼",lharul:"⥪",lhblk:"▄",LJcy:"Љ",ljcy:"љ",llarr:"⇇",ll:"≪",Ll:"⋘",llcorner:"⌞",Lleftarrow:"⇚",llhard:"⥫",lltri:"◺",Lmidot:"Ŀ",lmidot:"ŀ",lmoustache:"⎰",lmoust:"⎰",lnap:"⪉",lnapprox:"⪉",lne:"⪇",lnE:"≨",lneq:"⪇",lneqq:"≨",lnsim:"⋦",loang:"⟬",loarr:"⇽",lobrk:"⟦",longleftarrow:"⟵",LongLeftArrow:"⟵",Longleftarrow:"⟸",longleftrightarrow:"⟷",LongLeftRightArrow:"⟷",Longleftrightarrow:"⟺",longmapsto:"⟼",longrightarrow:"⟶",LongRightArrow:"⟶",Longrightarrow:"⟹",looparrowleft:"↫",looparrowright:"↬",lopar:"⦅",Lopf:"𝕃",lopf:"𝕝",loplus:"⨭",lotimes:"⨴",lowast:"∗",lowbar:"_",LowerLeftArrow:"↙",LowerRightArrow:"↘",loz:"◊",lozenge:"◊",lozf:"⧫",lpar:"(",lparlt:"⦓",lrarr:"⇆",lrcorner:"⌟",lrhar:"⇋",lrhard:"⥭",lrm:"‎",lrtri:"⊿",lsaquo:"‹",lscr:"𝓁",Lscr:"ℒ",lsh:"↰",Lsh:"↰",lsim:"≲",lsime:"⪍",lsimg:"⪏",lsqb:"[",lsquo:"‘",lsquor:"‚",Lstrok:"Ł",lstrok:"ł",ltcc:"⪦",ltcir:"⩹",lt:"<",LT:"<",Lt:"≪",ltdot:"⋖",lthree:"⋋",ltimes:"⋉",ltlarr:"⥶",ltquest:"⩻",ltri:"◃",ltrie:"⊴",ltrif:"◂",ltrPar:"⦖",lurdshar:"⥊",luruhar:"⥦",lvertneqq:"≨︀",lvnE:"≨︀",macr:"¯",male:"♂",malt:"✠",maltese:"✠",Map:"⤅",map:"↦",mapsto:"↦",mapstodown:"↧",mapstoleft:"↤",mapstoup:"↥",marker:"▮",mcomma:"⨩",Mcy:"М",mcy:"м",mdash:"—",mDDot:"∺",measuredangle:"∡",MediumSpace:" ",Mellintrf:"ℳ",Mfr:"𝔐",mfr:"𝔪",mho:"℧",micro:"µ",midast:"*",midcir:"⫰",mid:"∣",middot:"·",minusb:"⊟",minus:"−",minusd:"∸",minusdu:"⨪",MinusPlus:"∓",mlcp:"⫛",mldr:"…",mnplus:"∓",models:"⊧",Mopf:"𝕄",mopf:"𝕞",mp:"∓",mscr:"𝓂",Mscr:"ℳ",mstpos:"∾",Mu:"Μ",mu:"μ",multimap:"⊸",mumap:"⊸",nabla:"∇",Nacute:"Ń",nacute:"ń",nang:"∠⃒",nap:"≉",napE:"⩰̸",napid:"≋̸",napos:"ʼn",napprox:"≉",natural:"♮",naturals:"ℕ",natur:"♮",nbsp:" ",nbump:"≎̸",nbumpe:"≏̸",ncap:"⩃",Ncaron:"Ň",ncaron:"ň",Ncedil:"Ņ",ncedil:"ņ",ncong:"≇",ncongdot:"⩭̸",ncup:"⩂",Ncy:"Н",ncy:"н",ndash:"–",nearhk:"⤤",nearr:"↗",neArr:"⇗",nearrow:"↗",ne:"≠",nedot:"≐̸",NegativeMediumSpace:"​",NegativeThickSpace:"​",NegativeThinSpace:"​",NegativeVeryThinSpace:"​",nequiv:"≢",nesear:"⤨",nesim:"≂̸",NestedGreaterGreater:"≫",NestedLessLess:"≪",NewLine:"\n",nexist:"∄",nexists:"∄",Nfr:"𝔑",nfr:"𝔫",ngE:"≧̸",nge:"≱",ngeq:"≱",ngeqq:"≧̸",ngeqslant:"⩾̸",nges:"⩾̸",nGg:"⋙̸",ngsim:"≵",nGt:"≫⃒",ngt:"≯",ngtr:"≯",nGtv:"≫̸",nharr:"↮",nhArr:"⇎",nhpar:"⫲",ni:"∋",nis:"⋼",nisd:"⋺",niv:"∋",NJcy:"Њ",njcy:"њ",nlarr:"↚",nlArr:"⇍",nldr:"‥",nlE:"≦̸",nle:"≰",nleftarrow:"↚",nLeftarrow:"⇍",nleftrightarrow:"↮",nLeftrightarrow:"⇎",nleq:"≰",nleqq:"≦̸",nleqslant:"⩽̸",nles:"⩽̸",nless:"≮",nLl:"⋘̸",nlsim:"≴",nLt:"≪⃒",nlt:"≮",nltri:"⋪",nltrie:"⋬",nLtv:"≪̸",nmid:"∤",NoBreak:"⁠",NonBreakingSpace:" ",nopf:"𝕟",Nopf:"ℕ",Not:"⫬",not:"¬",NotCongruent:"≢",NotCupCap:"≭",NotDoubleVerticalBar:"∦",NotElement:"∉",NotEqual:"≠",NotEqualTilde:"≂̸",NotExists:"∄",NotGreater:"≯",NotGreaterEqual:"≱",NotGreaterFullEqual:"≧̸",NotGreaterGreater:"≫̸",NotGreaterLess:"≹",NotGreaterSlantEqual:"⩾̸",NotGreaterTilde:"≵",NotHumpDownHump:"≎̸",NotHumpEqual:"≏̸",notin:"∉",notindot:"⋵̸",notinE:"⋹̸",notinva:"∉",notinvb:"⋷",notinvc:"⋶",NotLeftTriangleBar:"⧏̸",NotLeftTriangle:"⋪",NotLeftTriangleEqual:"⋬",NotLess:"≮",NotLessEqual:"≰",NotLessGreater:"≸",NotLessLess:"≪̸",NotLessSlantEqual:"⩽̸",NotLessTilde:"≴",NotNestedGreaterGreater:"⪢̸",NotNestedLessLess:"⪡̸",notni:"∌",notniva:"∌",notnivb:"⋾",notnivc:"⋽",NotPrecedes:"⊀",NotPrecedesEqual:"⪯̸",NotPrecedesSlantEqual:"⋠",NotReverseElement:"∌",NotRightTriangleBar:"⧐̸",NotRightTriangle:"⋫",NotRightTriangleEqual:"⋭",NotSquareSubset:"⊏̸",NotSquareSubsetEqual:"⋢",NotSquareSuperset:"⊐̸",NotSquareSupersetEqual:"⋣",NotSubset:"⊂⃒",NotSubsetEqual:"⊈",NotSucceeds:"⊁",NotSucceedsEqual:"⪰̸",NotSucceedsSlantEqual:"⋡",NotSucceedsTilde:"≿̸",NotSuperset:"⊃⃒",NotSupersetEqual:"⊉",NotTilde:"≁",NotTildeEqual:"≄",NotTildeFullEqual:"≇",NotTildeTilde:"≉",NotVerticalBar:"∤",nparallel:"∦",npar:"∦",nparsl:"⫽⃥",npart:"∂̸",npolint:"⨔",npr:"⊀",nprcue:"⋠",nprec:"⊀",npreceq:"⪯̸",npre:"⪯̸",nrarrc:"⤳̸",nrarr:"↛",nrArr:"⇏",nrarrw:"↝̸",nrightarrow:"↛",nRightarrow:"⇏",nrtri:"⋫",nrtrie:"⋭",nsc:"⊁",nsccue:"⋡",nsce:"⪰̸",Nscr:"𝒩",nscr:"𝓃",nshortmid:"∤",nshortparallel:"∦",nsim:"≁",nsime:"≄",nsimeq:"≄",nsmid:"∤",nspar:"∦",nsqsube:"⋢",nsqsupe:"⋣",nsub:"⊄",nsubE:"⫅̸",nsube:"⊈",nsubset:"⊂⃒",nsubseteq:"⊈",nsubseteqq:"⫅̸",nsucc:"⊁",nsucceq:"⪰̸",nsup:"⊅",nsupE:"⫆̸",nsupe:"⊉",nsupset:"⊃⃒",nsupseteq:"⊉",nsupseteqq:"⫆̸",ntgl:"≹",Ntilde:"Ñ",ntilde:"ñ",ntlg:"≸",ntriangleleft:"⋪",ntrianglelefteq:"⋬",ntriangleright:"⋫",ntrianglerighteq:"⋭",Nu:"Ν",nu:"ν",num:"#",numero:"№",numsp:" ",nvap:"≍⃒",nvdash:"⊬",nvDash:"⊭",nVdash:"⊮",nVDash:"⊯",nvge:"≥⃒",nvgt:">⃒",nvHarr:"⤄",nvinfin:"⧞",nvlArr:"⤂",nvle:"≤⃒",nvlt:"<⃒",nvltrie:"⊴⃒",nvrArr:"⤃",nvrtrie:"⊵⃒",nvsim:"∼⃒",nwarhk:"⤣",nwarr:"↖",nwArr:"⇖",nwarrow:"↖",nwnear:"⤧",Oacute:"Ó",oacute:"ó",oast:"⊛",Ocirc:"Ô",ocirc:"ô",ocir:"⊚",Ocy:"О",ocy:"о",odash:"⊝",Odblac:"Ő",odblac:"ő",odiv:"⨸",odot:"⊙",odsold:"⦼",OElig:"Œ",oelig:"œ",ofcir:"⦿",Ofr:"𝔒",ofr:"𝔬",ogon:"˛",Ograve:"Ò",ograve:"ò",ogt:"⧁",ohbar:"⦵",ohm:"Ω",oint:"∮",olarr:"↺",olcir:"⦾",olcross:"⦻",oline:"‾",olt:"⧀",Omacr:"Ō",omacr:"ō",Omega:"Ω",omega:"ω",Omicron:"Ο",omicron:"ο",omid:"⦶",ominus:"⊖",Oopf:"𝕆",oopf:"𝕠",opar:"⦷",OpenCurlyDoubleQuote:"“",OpenCurlyQuote:"‘",operp:"⦹",oplus:"⊕",orarr:"↻",Or:"⩔",or:"∨",ord:"⩝",order:"ℴ",orderof:"ℴ",ordf:"ª",ordm:"º",origof:"⊶",oror:"⩖",orslope:"⩗",orv:"⩛",oS:"Ⓢ",Oscr:"𝒪",oscr:"ℴ",Oslash:"Ø",oslash:"ø",osol:"⊘",Otilde:"Õ",otilde:"õ",otimesas:"⨶",Otimes:"⨷",otimes:"⊗",Ouml:"Ö",ouml:"ö",ovbar:"⌽",OverBar:"‾",OverBrace:"⏞",OverBracket:"⎴",OverParenthesis:"⏜",para:"¶",parallel:"∥",par:"∥",parsim:"⫳",parsl:"⫽",part:"∂",PartialD:"∂",Pcy:"П",pcy:"п",percnt:"%",period:".",permil:"‰",perp:"⊥",pertenk:"‱",Pfr:"𝔓",pfr:"𝔭",Phi:"Φ",phi:"φ",phiv:"ϕ",phmmat:"ℳ",phone:"☎",Pi:"Π",pi:"π",pitchfork:"⋔",piv:"ϖ",planck:"ℏ",planckh:"ℎ",plankv:"ℏ",plusacir:"⨣",plusb:"⊞",pluscir:"⨢",plus:"+",plusdo:"∔",plusdu:"⨥",pluse:"⩲",PlusMinus:"±",plusmn:"±",plussim:"⨦",plustwo:"⨧",pm:"±",Poincareplane:"ℌ",pointint:"⨕",popf:"𝕡",Popf:"ℙ",pound:"£",prap:"⪷",Pr:"⪻",pr:"≺",prcue:"≼",precapprox:"⪷",prec:"≺",preccurlyeq:"≼",Precedes:"≺",PrecedesEqual:"⪯",PrecedesSlantEqual:"≼",PrecedesTilde:"≾",preceq:"⪯",precnapprox:"⪹",precneqq:"⪵",precnsim:"⋨",pre:"⪯",prE:"⪳",precsim:"≾",prime:"′",Prime:"″",primes:"ℙ",prnap:"⪹",prnE:"⪵",prnsim:"⋨",prod:"∏",Product:"∏",profalar:"⌮",profline:"⌒",profsurf:"⌓",prop:"∝",Proportional:"∝",Proportion:"∷",propto:"∝",prsim:"≾",prurel:"⊰",Pscr:"𝒫",pscr:"𝓅",Psi:"Ψ",psi:"ψ",puncsp:" ",Qfr:"𝔔",qfr:"𝔮",qint:"⨌",qopf:"𝕢",Qopf:"ℚ",qprime:"⁗",Qscr:"𝒬",qscr:"𝓆",quaternions:"ℍ",quatint:"⨖",quest:"?",questeq:"≟",quot:'"',QUOT:'"',rAarr:"⇛",race:"∽̱",Racute:"Ŕ",racute:"ŕ",radic:"√",raemptyv:"⦳",rang:"⟩",Rang:"⟫",rangd:"⦒",range:"⦥",rangle:"⟩",raquo:"»",rarrap:"⥵",rarrb:"⇥",rarrbfs:"⤠",rarrc:"⤳",rarr:"→",Rarr:"↠",rArr:"⇒",rarrfs:"⤞",rarrhk:"↪",rarrlp:"↬",rarrpl:"⥅",rarrsim:"⥴",Rarrtl:"⤖",rarrtl:"↣",rarrw:"↝",ratail:"⤚",rAtail:"⤜",ratio:"∶",rationals:"ℚ",rbarr:"⤍",rBarr:"⤏",RBarr:"⤐",rbbrk:"❳",rbrace:"}",rbrack:"]",rbrke:"⦌",rbrksld:"⦎",rbrkslu:"⦐",Rcaron:"Ř",rcaron:"ř",Rcedil:"Ŗ",rcedil:"ŗ",rceil:"⌉",rcub:"}",Rcy:"Р",rcy:"р",rdca:"⤷",rdldhar:"⥩",rdquo:"”",rdquor:"”",rdsh:"↳",real:"ℜ",realine:"ℛ",realpart:"ℜ",reals:"ℝ",Re:"ℜ",rect:"▭",reg:"®",REG:"®",ReverseElement:"∋",ReverseEquilibrium:"⇋",ReverseUpEquilibrium:"⥯",rfisht:"⥽",rfloor:"⌋",rfr:"𝔯",Rfr:"ℜ",rHar:"⥤",rhard:"⇁",rharu:"⇀",rharul:"⥬",Rho:"Ρ",rho:"ρ",rhov:"ϱ",RightAngleBracket:"⟩",RightArrowBar:"⇥",rightarrow:"→",RightArrow:"→",Rightarrow:"⇒",RightArrowLeftArrow:"⇄",rightarrowtail:"↣",RightCeiling:"⌉",RightDoubleBracket:"⟧",RightDownTeeVector:"⥝",RightDownVectorBar:"⥕",RightDownVector:"⇂",RightFloor:"⌋",rightharpoondown:"⇁",rightharpoonup:"⇀",rightleftarrows:"⇄",rightleftharpoons:"⇌",rightrightarrows:"⇉",rightsquigarrow:"↝",RightTeeArrow:"↦",RightTee:"⊢",RightTeeVector:"⥛",rightthreetimes:"⋌",RightTriangleBar:"⧐",RightTriangle:"⊳",RightTriangleEqual:"⊵",RightUpDownVector:"⥏",RightUpTeeVector:"⥜",RightUpVectorBar:"⥔",RightUpVector:"↾",RightVectorBar:"⥓",RightVector:"⇀",ring:"˚",risingdotseq:"≓",rlarr:"⇄",rlhar:"⇌",rlm:"‏",rmoustache:"⎱",rmoust:"⎱",rnmid:"⫮",roang:"⟭",roarr:"⇾",robrk:"⟧",ropar:"⦆",ropf:"𝕣",Ropf:"ℝ",roplus:"⨮",rotimes:"⨵",RoundImplies:"⥰",rpar:")",rpargt:"⦔",rppolint:"⨒",rrarr:"⇉",Rrightarrow:"⇛",rsaquo:"›",rscr:"𝓇",Rscr:"ℛ",rsh:"↱",Rsh:"↱",rsqb:"]",rsquo:"’",rsquor:"’",rthree:"⋌",rtimes:"⋊",rtri:"▹",rtrie:"⊵",rtrif:"▸",rtriltri:"⧎",RuleDelayed:"⧴",ruluhar:"⥨",rx:"℞",Sacute:"Ś",sacute:"ś",sbquo:"‚",scap:"⪸",Scaron:"Š",scaron:"š",Sc:"⪼",sc:"≻",sccue:"≽",sce:"⪰",scE:"⪴",Scedil:"Ş",scedil:"ş",Scirc:"Ŝ",scirc:"ŝ",scnap:"⪺",scnE:"⪶",scnsim:"⋩",scpolint:"⨓",scsim:"≿",Scy:"С",scy:"с",sdotb:"⊡",sdot:"⋅",sdote:"⩦",searhk:"⤥",searr:"↘",seArr:"⇘",searrow:"↘",sect:"§",semi:";",seswar:"⤩",setminus:"∖",setmn:"∖",sext:"✶",Sfr:"𝔖",sfr:"𝔰",sfrown:"⌢",sharp:"♯",SHCHcy:"Щ",shchcy:"щ",SHcy:"Ш",shcy:"ш",ShortDownArrow:"↓",ShortLeftArrow:"←",shortmid:"∣",shortparallel:"∥",ShortRightArrow:"→",ShortUpArrow:"↑",shy:"­",Sigma:"Σ",sigma:"σ",sigmaf:"ς",sigmav:"ς",sim:"∼",simdot:"⩪",sime:"≃",simeq:"≃",simg:"⪞",simgE:"⪠",siml:"⪝",simlE:"⪟",simne:"≆",simplus:"⨤",simrarr:"⥲",slarr:"←",SmallCircle:"∘",smallsetminus:"∖",smashp:"⨳",smeparsl:"⧤",smid:"∣",smile:"⌣",smt:"⪪",smte:"⪬",smtes:"⪬︀",SOFTcy:"Ь",softcy:"ь",solbar:"⌿",solb:"⧄",sol:"/",Sopf:"𝕊",sopf:"𝕤",spades:"♠",spadesuit:"♠",spar:"∥",sqcap:"⊓",sqcaps:"⊓︀",sqcup:"⊔",sqcups:"⊔︀",Sqrt:"√",sqsub:"⊏",sqsube:"⊑",sqsubset:"⊏",sqsubseteq:"⊑",sqsup:"⊐",sqsupe:"⊒",sqsupset:"⊐",sqsupseteq:"⊒",square:"□",Square:"□",SquareIntersection:"⊓",SquareSubset:"⊏",SquareSubsetEqual:"⊑",SquareSuperset:"⊐",SquareSupersetEqual:"⊒",SquareUnion:"⊔",squarf:"▪",squ:"□",squf:"▪",srarr:"→",Sscr:"𝒮",sscr:"𝓈",ssetmn:"∖",ssmile:"⌣",sstarf:"⋆",Star:"⋆",star:"☆",starf:"★",straightepsilon:"ϵ",straightphi:"ϕ",strns:"¯",sub:"⊂",Sub:"⋐",subdot:"⪽",subE:"⫅",sube:"⊆",subedot:"⫃",submult:"⫁",subnE:"⫋",subne:"⊊",subplus:"⪿",subrarr:"⥹",subset:"⊂",Subset:"⋐",subseteq:"⊆",subseteqq:"⫅",SubsetEqual:"⊆",subsetneq:"⊊",subsetneqq:"⫋",subsim:"⫇",subsub:"⫕",
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diff --git a/webpack.config.js b/webpack.config.js
index 6badafd2f..d46f55bf6 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,13 +1,12 @@
+var CopyWebpackPlugin = require('copy-webpack-plugin');
+var defaultsDeep = require('lodash.defaultsdeep');
+var path = require('path');
 var webpack = require('webpack');
 
-module.exports = {
-    entry: {
-        'vm': './src/index.js',
-        'vm.min': './src/index.js'
-    },
-    output: {
-        path: __dirname,
-        filename: '[name].js'
+var base = {
+    devServer: {
+        contentBase: path.resolve(__dirname, 'playground'),
+        host: '0.0.0.0'
     },
     module: {
         loaders: [
@@ -27,3 +26,93 @@ module.exports = {
         })
     ]
 };
+
+module.exports = [
+    // Web-compatible, playground
+    defaultsDeep({}, base, {
+        entry: {
+            'vm': './src/index.js',
+            'vm.min': './src/index.js'
+        },
+        output: {
+            path: __dirname,
+            filename: '[name].js'
+        },
+        module: {
+            loaders: base.module.loaders.concat([
+                {
+                    test: require.resolve('./src/index.js'),
+                    loader: 'expose?VirtualMachine'
+                }
+            ])
+        }
+    }),
+    // Webpack-compatible
+    defaultsDeep({}, base, {
+        entry: {
+            'dist': './src/index.js'
+        },
+
+        output: {
+            library: 'VirtualMachine',
+            libraryTarget: 'commonjs2',
+            path: __dirname,
+            filename: '[name].js'
+        }
+    }),
+    // Playground
+    defaultsDeep({}, base, {
+        entry: {
+            'vm': './src/index.js',
+            'vendor': [
+                // FPS counter
+                'stats.js/build/stats.min.js',
+                // Syntax highlighter
+                'highlightjs/highlight.pack.min.js',
+                // Scratch Blocks
+                'scratch-blocks/dist/vertical.js',
+                // Renderer
+                'scratch-render'
+            ]
+        },
+        output: {
+            path: path.resolve(__dirname, 'playground'),
+            filename: '[name].js'
+        },
+        module: {
+            loaders: base.module.loaders.concat([
+                {
+                    test: require.resolve('./src/index.js'),
+                    loader: 'expose?VirtualMachine'
+                },
+                {
+                    test: require.resolve('stats.js/build/stats.min.js'),
+                    loader: 'script'
+                },
+                {
+                    test: require.resolve('highlightjs/highlight.pack.min.js'),
+                    loader: 'script'
+                },
+                {
+                    test: require.resolve('scratch-blocks/dist/vertical.js'),
+                    loader: 'expose?Blockly'
+                },
+                {
+                    test: require.resolve('scratch-render'),
+                    loader: 'expose?RenderWebGL'
+                }
+            ])
+        },
+        plugins: base.plugins.concat([
+            new CopyWebpackPlugin([{
+                from: 'node_modules/scratch-blocks/media',
+                to: 'media'
+            }, {
+                from: 'node_modules/highlightjs/styles/zenburn.css'
+            }, {
+                from: 'assets',
+                to: 'assets'
+            }])
+        ])
+    })
+];