http://stackoverflow.com/questions/11373843/securing-rest-api-on-play-framework-and-oauth2
http://stackoverflow.com/questions/10018604/how-to-use-oauth-2-in-play-framework-2-0
http://stackoverflow.com/questions/12319385/angularjs-oauth-play-2-0
http://hueniverse.com/2007/10/beginners-guide-to-oauth-part-i-overview/