Updated Xamarin.Social reference
Merge pull request #6 from stampsy/UpdateXamarinSocial

Updated Xamarin.Social reference
Fix a bug where if activity isnt null and allow login ui is true we get duplicate account provider.
Merge pull request #7 from stampsy/AdnroidDuplicateAccountProviderFix

Fix a bug where if activity isnt null and allow login ui is true we get ...