uninitialized constant OmniAuth in lib/gitlab/auth.rb

Created by: raphendyr

raise OmniAuth::Error do not work in ko. file.

require 'omniauth' didn't do the trick and I do not have an idea how to fix this.

Problematic line: https://github.com/gitlabhq/gitlabhq/commit/048d47e6266b5b078a169f1657d07883e86f169b#L2R27

I can fix and make PR if someone can hint how.