Change-Id: I3a7c13b4c626f8b5ea2a63717dfe4249c19eebb4

Automatic detection also will now also display a plain text "readme"
or "readme.txt" file.

Change-Id: Id6be729bdc469e7a5cfd1f4144df340a6b93475e

Change-Id: I431659cf1d57a8d9bffb065fa47e1296e7f8c838

Change-Id: I9f91138b20219be6e3c4b28251487df262bff6cc

Change-Id: I74b3f9fedd77294c53648f8eaa730d4a84917555

Change-Id: I3460c9c0eeb32503d58325fd09793a0cd40aa2c4

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.

Also hooked-up GC settings in the Manager.

The fork mechanism clones the repository , access restrictions, and
other config options.  The app has been updated throughout to handle
personal repositories and to properly display origin/fork links.

In order to fork a repository the user account must have the #fork role,
the origin repository must permit forking, and the user account must
have standard clone permissions to the repository.

Because forking introduces a new user role no existing user accounts can
automatically begin forking a repository.  This is both a pro and a con.

Since the fork has the same access restrictions as the origin repository,
those who can access the origin may also access the fork.  This is intentional
to facilitate integration-manager workflow.  The fork owner does have the
power to completely change the access restrictions of his/her fork.

symbolic head and available heads.

Added convenience methods to JGitUtils to support retrieving available
heads as List<String>.
When resolving the symbolic head target as a String, if the head is
detached, attempt to match the commit SHA1 against the known tags, using
the most recent tag if more than one matches.
Revised error messaging to better reflect actual outcome.
Adjusted tab indexes on edit repository page to include default head combo
box.
Updated message key for default head combo box to use uppercase "HEAD".