The JGit team is now publishing 0.12.1 artifacts on the Eclipse Maven
site. Yeah! That was the last missing piece for a slick Git:Blit
deployment. The build has been reworked to download from Eclipse and
to also download source and javadoc jars for setting up a development
environment.

Made the log4j pattern configurable by operating system.
Moved Markdown utils to their own class since I need StringUtils for
Build and that introduced a chicken-and-egg scenario.

Also fixed /dev/null reference due to deletion change.

This is for history where we specify two revs to diff, not just a
commit against its parent.

The current ticgit implementation is based on ticgit.net, a BSD
implementation for C#.  Jeff Welling advises using commit
bf57b032e0 (2009-01-27) from ticgit as the last MIT licensed
commit.

A more complete implementation will be based on this version of the
original Ruby sources.  It remains unclear if I will support using the
"ticgit" branch name or not.  I purposefully haven't looked at any of
the GPL improvements by Jeff, but I can see from the readme at GitHub
that he has renamed the branch to "ticgit-ng" which I have no plans on
supporting as I do not want to taint GitBlit with GPL code.

Settings access has been abstracted and the way is becoming clear to
offer a WAR build in addition to the integrated server stack.  Util
methods moved around.

Change-Id: Ifce000c85c8947c3a768e782c841e41a8953d314