Change-Id: I717e13d1f852a4adf50b547f4769dd62da2384ce

This is a massive commit which reorganizes the entire project structure
(although it is still monolithic), removes the Build classes, and
switches to Moxie, a smarter Ant build tookit based on the original
Gitblit Build classes.

The Ant build script will likely require additional fine-tuning, but
this is big step forward.

HEAD is now properly reset if mirroring is enabled.  Updated the
federation pull status enum to include no change and mirrored states.