Update CONTRIBUTING.md

Author: jophde

CONTRIBUTING.md

@@ -4,4 +4,8 @@
 
 We welcome contributions and feedback! All contributors must sign our [Contributor License Agreement (CLA)](https://docs.google.com/a/optimizely.com/forms/d/e/1FAIpQLSf9cbouWptIpMgukAKZZOIAhafvjFCV8hS00XJLWQnWDFtwtA/viewform) to be eligible to contribute.
 
-Simply create a branch off of `master`.  When the work on the branch is complete make a pull request.
+Simply create a branch off of `master`.  When the work on the branch is complete make a pull request.  Pull requests should be squashed and merged into `devel`.
+
+All branches will be built and run against the entire test suite on Travis with every commit.  
+
+The `test-app` module is built against a real Optimizely project.  Changing the project ID will cause tests to fail.  The test app should be used as a reference.