Add notification support for gitter when running tests on travis.

.travis.yml

@@ -11,6 +11,14 @@ notifications:
   on_success: change
   skip_join: true
 
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/5d0244ab020a75bf7d17
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: never # default: never
+
 addons:
   postgresql: "9.1"