Go to the Wiki for more info
The unit tests require a submodule. Be sure to fetch it with 'git submodule update --init' If it's your first time looking at the source have a look at the class diagram in the dotGit project. It should get you up to speed.
If you find any bugs or would like to see a feature implemented please report it at http://pheew.lighthouseapp.com/projects/21305/home