Added Authomatic under OAuth client/providor

Added [Authomatic](https://github.com/peterhudec/authomatic) under OAuth client/providor

Authomatic provides Out of the box support for:
- OAuth 1.0a providers: Bitbucket, Flickr, Meetup, Plurk, Twitter, Tumblr, UbuntuOne, Vimeo, Xero, Xing and Yahoo.
- OAuth 2.0 providers: Behance, Bitly, Cosm, DeviantART, Facebook, Foursquare, GitHub, Google, LinkedIn, PayPal, Reddit, Viadeo, VK, WindowsLive, Yammer and Yandex.