The battle with OAuth.

I've been battling OAuth, all day, today.  In Xamarin.Auth.  The fundamental problem is that it didn't support JSON responses.. so I pulled down the GitHub repo.. started dinking with it.

I eventually got it to work.  Took quite a bit of fighting.  I'm looking forward to using it here soon, for the Xamarin.IOS app and for the Xamarin.Android app.