Update post-receive worker to use correct identifier
Gitlab::ShellEnv added
require missing lib
fix archive download : not creating namespace directory
Merge pull request #2989 from PierreGambarotto/master

archive download : namespace directory not created
Merge pull request #2987 from Undev/support_env_in_settings

Environments support added to Gitlab config
Enumerize gem added
Issue tracker field added to projects
Issue tracker added to edit project form in admin area
Project issue tracker functions refactored
External issue tracker params added to config
New field added
Migration added
Issues helper improved
Issues helper included to markdown helper
Wrong default section in config. Fixed.
Default value for issues_tracker setting added