Updating travis to use nodejs 4

.travis.yml

@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - "0.10"
+  - "4.0"
 before_script:
   - npm install -g gulp
   - cd ./Tools/Gulp
   - npm install
-script: gulp typescript
+script: gulp typescript