Some fix for gitlab:gitlab_shell:check

Fixing issue #2970

Update lib/tasks/sidekiq.rake

API: Fixes return code when accessing non existent branch (#2922)

Merge branch 'easy-to-find-commit-on-network-graph' of https://github.com/hiroponz/gitlabhq into hiroponz-easy-to-find-commit-on-network-graph

Disable autocomplete for admin/users form

Different status codes in the API lib are returned on hook creation, update or deletion.
If a required parameter is not given (e.g. `url` in `/projects/:id/hooks/:hook_id`) status
code 400 (Bad request) is returned. On hook deletion a 200 status code is returned, regardless if
the hook is present or not. This makes the DELETE function an idempotent operation. Appropriate tests
are added to check these status codes.

Mac OS uses launchd instead of /etc/init.d to start daemons and tasks to be started by launchd MUST NOT daemon itself. So "nohup" here won't work for Mac OS. 

Can we add a "launchd" task to the rake file so that we can start sidekiq as "bundle exec rake sidekiq:launchd" ?

Gitlab incorrectly routes blobs to the compare controller depending on filename.

Merge branch 'fix-db-after-updating-rails' of https://github.com/Undev/gitlabhq into Undev-fix-db-after-updating-rails