owin-middleware/OwinOAuthProviders — pull request #42 by ravind (2014-11-24 01:47:44+00:00)
Title: Added Yammer

I needed to add Yammer authentication for one of my projects, so I added in that functionality. It's my first time delving into the innards of Owin/Katana Authentication so please review. The "AcceptedNetworks" option lets you optionally restrict authentication to members of specific yammer networks.