feat(build): add gitter webhook for travis

Author: Awk34

Diff for: .travis.yml

@@ -8,3 +8,10 @@ before_install:
   - gem install sass --version "=3.3.7"
   - npm install -g bower grunt-cli
 services: mongodb
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/911ed472ef19bcb27858
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: false     # default: false