https://gitlab.com/gitlab-org/gitlab-ce/blob/f67eb5a1ab6ec75aae24db4b3b98e23faafa6de6/config/initializers/1_settings.rb#L397-401 -> Moved to #1255 (closed)
https://gitlab.com/gitlab-org/gitlab-ce/blob/f67eb5a1ab6ec75aae24db4b3b98e23faafa6de6/config/initializers/6_validations.rb#L41-48