What the messages should look like
Have the listener call the right TC messenger methods
Only create the teamcity class if it teamcity libs are available
Make the verbose false by default
Add events for when example groups start and finish
Send messages to teamcity
Merge branch 'pretty-reports' into teamcity-test

Conflicts:
	lib/medusa/listener/teamcity.rb
	lib/medusa/teamcity/messenger.rb