Update Travis CI config

* Use the container based infrastructure
* Don't attempt to npm install twice (though there was no effect)

.travis.yml

@@ -1,26 +1,35 @@
+sudo: false
+
 language: node_js
+
 node_js:
   - 0.10
 
+addons:
+  apt:
+    sources:
+      - mongodb-upstart
+    packages:
+      - mongodb-org-server
+
+cache:
+  directories:
+    - node_modules
+    - bower_components
+
 before_install:
-  - "sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10"
-  - "echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list"
-  - "sudo apt-get update"
-  - "sudo apt-get install mongodb-org-server"
+  - npm install -g npm@latest
 
 before_script:
-  - "npm install"
   - export DISPLAY=:99.0
   - export COCO_TRAVIS_TEST=1
   - sh -e /etc/init.d/xvfb start
   - "./node_modules/.bin/bower install"
   - "gem install sass"
   - "./node_modules/.bin/brunch b"
-  - "mkdir mongo"
-  - "mongod --dbpath=./mongo --fork --logpath ./mongodb.log"
   - "node index.js --unittest &"
   - "sleep 10" # to give node a chance to start
 
 script:
   - "./node_modules/jasmine-node/bin/jasmine-node test/server/ --coffee --captureExceptions"
-  # - "./node_modules/karma/bin/karma start --browsers Firefox --single-run --reporters progress"
+  - "./node_modules/karma/bin/karma start --browsers Firefox --single-run --reporters progress"