* stable-4.8:
SubmoduleUpdateCommand#setCallback should return 'this'
CloneCommand#setCallback should return 'this'
Prepare 4.7.2-SNAPSHOT builds
JGit v4.7.1.
201706071930-r
ArchiveCommand: Create prefix entry with commit time
Run auto GC in the background
Update Orbit to the Oxygen version R20170516192513
Change-Id: Ibf90b4899d097474e7836e6baab8829e66fca524
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>