Switch from ruby sass to node-sass.

Support heroko style PORT specification

config.coffee

@@ -200,7 +200,7 @@ exports.config =
       output:
         semicolons: false
     sass:
-      mode: 'ruby'
+      mode: 'native'
       allowCache: true
     bless:
       cacheBuster: false

package.json

@@ -107,13 +107,14 @@
     "marked": "0.2.x",
     "nodemon": "0.7.5",
     "requirejs": "~2.1.10",
-    "sass-brunch": "^1.8.8",
+    "@basicer/sass-brunch": "^1.9.1",
     "telepath-brunch": "https://github.com/nwinter/telepath-brunch/tarball/master",
     "uglify-js-brunch": "~1.7.4"
   },
   "license": "MIT for the code, and CC-BY for the art and music",
   "private": true,
   "engines": {
-    "node": "0.10.x"
+    "node": "0.10.x",
+    "npm": "^3.0.0"
   }
 }

server_config.coffee

@@ -6,7 +6,7 @@ config.tokyo = process.env.TOKYO or false
 config.saoPaulo = process.env.SAOPAULO or false
 config.chinaDomain = "http://cn.codecombat.com"
 config.brazilDomain = "http://br.codecombat.com"
-config.port = process.env.COCO_PORT or process.env.COCO_NODE_PORT or 3000
+config.port = process.env.COCO_PORT or process.env.COCO_NODE_PORT or process.env.PORT  or 3000
 config.ssl_port = process.env.COCO_SSL_PORT or process.env.COCO_SSL_NODE_PORT or 3443
 config.cloudflare =
   token: process.env.COCO_CLOUDFLARE_API_KEY or ''