fix build failure

(https://travis-ci.org/gitlabhq/gitlabhq/builds/3593153)
remove hardcoded app_dir from unicorn.rb.example
Show only ≤16 lines of code in a discussion (fix issue #2860).
Replacing the manual parsing of the /etc/group file with the equivalent call from the Etc class in the Ruby standard library. This has the benefit of supporting additional platforms (e.g. OS X).
preparing for gitlab-shell
Make gitlab works with gitlab-shell
update installation docs
remove update_repository calls
Fix satellites to use filesystem. Correct post-receive user finder
Internal API
remove gitolite stub
Fix typo.
The commit is marked and displayed in the center.
Enable to display the commit older than 650th commit.
remove unexisting stubs
update structure
Remove outdated specs and fixed key remove
add remove keys from gitlab-shell by id
Add search box for the commit.
Fix bug when it has been switched to tag.