Attempt to add staging link to Travis notifications

.travis.yml

@@ -27,3 +27,8 @@ deploy:
 notifications:
   slack:
     secure: 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
+    template:
+      - "%{repository}#%{build_number} (%{branch} - %{commit} : %{author}): %{message}"
+      - "Change view : %{compare_url}"
+      - "Build details : %{build_url}"
+      - "Review : http://hackathon.transloadit.com.s3.amazonaws.com/transloadit-js-client/%{branch}/index.html"