Normalize URL's to /event/github and /event/travis

This should be the final URL scheme for the time being.  I'm going to
continue to refactor the Sinatra application though.

I'm intentionally committing without updating the tests to see just how
bad it is...
Add example JSON hook when Travis builds fail

This patch adds an example of the JSON that's posted when a Travis build
fails.  This enables behavior testing.
WIP - Add logging for previous URL endpoints
Update dependencies for pry