Allowing for a devleoper sign in outside of production.

This has been very annoying over time. Although I hate the idea of
having an 'if production', it is better than commenting out code.
Ideally I'd have this as a gem that I would only include in development
but since omniauth already has it, the if (in two places) will have to do.
Switching to localized gem instead of 'magic' version

Magic is not being maintained while the original one is ready for
rails 4. In order to help with #61, I'll slowly remove all non
rails 4 compatible gems.