* stable-2.1:
Prepare for 2.1 maintenance changes
JGit v2.1.0.201209190230-r
Introduce "never" as parseable date
Introduce ParseExceptions for GitDateParser
Support config param "gc.pruneexpire"
Change-Id: If149d7f968a3425d9425f6ba9ce135a8341776a7 Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>