Add Social Logins. about panoptes

[camallen]

Maybe github as well?

[camallen]

This will require changed / modified validations on the user model. If they sign up with third party authentication service then they only need a login. Post signup as discussed in #70.

Internal user accounts will require Login, Email and Password (possibly display name / credited name) to streamline signup.

[edpaget]

It's now pretty easy to add more login options. all you have to do is add the omniauth gem for your desired provider:

• Github: https://github.com/intridea/omniauth-github
• Twitter: https://github.com/arunagw/omniauth-twitter
• Weibo: https://github.com/beenhero/omniauth-weibo-oauth2 (<- May need minor tweaks for new omniauth version)
• VKontakte: https://github.com/mamantoha/omniauth-vkontakte

Then add an entry to config/social.yml:

env:
  provider:
    app_id: asdfasdf
    app_secret: asdfasdfasdf2asdfasdf
    scope: 'email'
    other_opts: 

[edpaget]

Closing this since adding extra logins should be super easy now.