added travis notifications

.travis.yml

 
 script:
   - test ! -e .kitchen.yml || bundle exec kitchen test -t tests/integration
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/6123573504759330786b
+    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
+    on_cancel: never    # options: [always|never|change] default: always
+    on_error: always    # options: [always|never|change] default: always