Add git-fat support
Along with the gitlab-shell changes in gitlab-shell!7 (closed), this adds git-fat support and management to GitLab.
Each project can enable or disable git-fat support which enables git-fat usage over SSH and rsync.
This should work with both https://github.com/jedbrown/git-fat and https://github.com/cyaninc/git-fat, but for now I am only testing with the cyaninc fork. HTTP access is planned, but not yet supported for supporting public cloning.