update the listener readme a little
add a license file
improve the readme a little
add the build status badge only for master
link up some text
remove gemnasium as it thinks we have no deps
add a simple diagram
minor correction to the readme
add a contributing md file
add an example travis config
remove some uneeded config elements
Log what kind of event we're receving

This makes it easier to see if we're receiving a certain event type when
looking at the logs in Papertrail.
redirect get requests to / to the about site
Merge branch 'master' of github.com:travis-ci/travis-listener
change ping to event