Added travisCI integration to expose test visibility.

This requires a little bit of work outside of accepting the pull request.

1. Sign into travisci.com with the indeedeng Github account.
2. Enable TravisCI for proctor.
3. Accept pull request.

When a pull request is made through Github, a travis build will be automatically kicked off to ensure that the pull request passes the tests.  The change that was made to the read me will add a badge to the Github page with the current build status of the project.  This makes it easy for anyone that is quickly checking out the project and curious about the build status.

Preview of Example Build:
https://travis-ci.org/jpitz/proctor