Add a ChangeListener example.

Adds a ChangeListener that listens for MergeEvents and if they
have a bugzilla link, the merge is logged.
Updated the gerrit slides

This includes the Change Listener, and Dev. Tools slides.
Also updates the Anatomy image
Updated the slide
Merge remote-tracking branch 'sop/master'

Conflicts:
	gerrit-api-econ2014.slide
Fix typo on module introduction slide