Faster builds and update npm versions to test against

Remove node_js 0.11 because that release does not exist.

Add npm to test against 4.2.0 and 5.0.0.

Add sudo: false so the builds can be tested much much faster 

http://docs.travis-ci.com/user/workers/container-based-infrastructure/

.travis.yml

@@ -1,8 +1,9 @@
 language: node_js
 node_js:
+  - "5.0.0"
+  - "4.2.0"
   - "4.0.0"
   - "0.12"
-  - "0.11"
   - "0.10"
 install:
   - npm install -g grunt-cli
@@ -11,3 +12,4 @@ env:
   global:
     - secure: TrNVruWYaUK5ALga1y7wRY+MLjWJECUSCsBmKW5EUmIevOUxqHWu7M89FANKxstEeFRRAGH3QJbloRxnzIgh0U0ah5npE9XA1bYXGO5khoXeIyk7pNRfjIo8aEnJH1Vp8vWA6J6ovxdJ7lCFKEGvGKxGde50knVl7KFVVULlX2U=
     - secure: Rzh+CEI7YRvvVkOruPE8Z0dkU0s13V6b6cpqbN72vxbJl/Jm5PUZkjTFJdkWJrW3ErhCKX6EC7XdGvrclqEA9WAqKzrecqCJYqTnw4MwqiAj6F9wqE/BqhoWg4xPxm0MK/7eJMvLCgjNpe+gc1CaeFJZkLSNWn6nOFke+vVlf9Q=
+sudo: false