- Offloads uploading to GitLab Workhorse
- Use /authorize request for fast uploading
- Added backup recipes for artifacts
- Support download acceleration using X-Sendfile

delay is in seconds
more legible code in session_store
Added `GitLab restart required` help block to session_expire_delay

settings

Fix bug where error messages from Dropzone would not be displayed on the issues page

Closes #1258

Add checkboxes to the application settings page for restricted
visibility levels, and remove those settings from gitlab.yml.

While loading the Rails app we cannot assume that the gitlabhq_xxx
database exists already. If we do, `rake gitlab:setup` breaks!

This is a quick hack to make sure that fresh development setups of
GitLab (from master) will work again.