updated travis.yml

.travis.yml

 language: node_js
 node_js:
+  - "0.11"
   - "0.10"
-# before_script:
-#   - npm install
-#   - gulp build
\ No newline at end of file
+  - "0.8"
+  - "0.6"
+  - "0.5"
+  - "0.4"
+before_script:
+  - npm install
+after_script:
+  - npm run-script gulp
\ No newline at end of file