Add omniauth gems
Add provider, uid, and name to users model
Add github, google, and twitter oauth config creds
Make user omniauthable and setup oauth login links
Implement omniauth callback and user creation support

Just deals with Twitter for now, GitHub and Google coming soon
Add callback support for GitHub and Google
Add Facebook oauth login support
Merge pull request #27 from f3ndot/add-omniauth-providers-to-app

Omniauth providers to app