I created stable-3.0 branches and tagged 18.104.22.168305080800-m7 and contributed it to Kepler M7.
Find this version here:
Kepler staging p2 repository
JGit/EGit p2 repository:
EGit Github connector p2 repository:
JGit maven repositoryhttp://download.eclipse.org/jgit/staging/3.0.0.M7/m2
Please help to test this version and report problems.
From now on push any changes which should reach 3.0 to review for branch stable-3.0.