Add Gitter webhook for Travis

.travis.yml

@@ -3,4 +3,11 @@ node_js:
   - 0.10
 before_script:
   - npm install -g grunt-cli
-  - npm install -g jasmine-node
+  - npm install -g jasmine-node
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/9c767842144fd24d26a5
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: false     # default: false