Right now the implementation is hard-coded to pass the realm into a
singleton.  This won't work for a WAR distribution so I will
need to figure out how to properly authenticate the webapp using form
authentication and the git servlet using basic authentication - host
against the same realm.

This seems to improve page loading times.

Added placeholder for Admin links on main page.
Dynamically add ticgit link to nav links, if ticgit branch is
discovered.
Settings refinements.

Change-Id: Ifce000c85c8947c3a768e782c841e41a8953d314