Add Travis notifications to Gitter.im room

Author: arnested

.travis.yml

@@ -13,3 +13,8 @@ env:
 script:
   - emacs --version
   - make test
+notifications:
+  webhooks: https://webhooks.gitter.im/e/fa0500ce49cab8dc8144
+  on_success: change
+  on_failure: always
+  on_start: never