Merge branch 'stable-2.10'

* stable-2.10:
  Update 2.10 release notes
  Update JGit to 3.5.3.201412180710-r
  Release notes for Gerrit 2.9.4
  Set version to 2.9.4
  Update JGit to 3.4.2.201412180340-r

Conflicts:
	lib/jgit/BUCK

Change-Id: I174c722d5004ab507fdfc402de0a65f5057583a3