Add semaphore config to ci testing doc.
Merge branch 'add-semaphore-config' into 'master'

Add semaphore config

See merge request !1100
Fix star/fork button UI issue if count > 100
Warn about restoring to the same version.
Create stable branch at 17th
Merge branch 'same-version-restore' into 'master'

Same version restore

Warn users about this.

See merge request !1101
Merge branch 'release-branch-earlier' into 'master'

Release branch earlier

Fixes #1603

See merge request !1102
Merge branch 'master' of github.com:gitlabhq/gitlabhq