+ Supports referencing:
  + Tickets from other tickets via comments
  + Tickets from commits on any branch
+ Common TicketLink class used for both commits and tickets
  + TicketLink is temporary and persisted to ticket as a Reference
+ Support deletion of ticket references
  + Rebasing patchsets/branches will generate new references
  + Deleting old patchsets/branches will remove the relevant references
+ Substantial testing of use cases
  + With and without patchsets, deleting, amending
  + BranchTicketService used during testing to allow end-to-end ref testing
+ Relocated common git helper functions to JGitUtils

Adding the possibility to define authentication method order for ssh

background service. Introduced configuration property to configure the
synchronization period.

Change-Id: I336e005e02623fc5e11a4f8b4408bea5465a43fd

Change-Id: I04639db977c515e5e1090ef8f0e1ce858820cb03

Change-Id: I603d4524914e94ec8e02c3689b65465b42c23dd7

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.