forward travis status to gitter

.travis.yml

@@ -69,3 +69,11 @@ script:
 
 after_success:
   - ./test/merge.sh
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/7c45628030298f184461
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start:   never   # options: [always|never|change] default: always