Fix duplicate registration bug in Xamarin iOS client
Merge pull request #359 from toddreifsteck/dev

[Xamarin.iOS] Fix duplicate registration bug in Xamarin iOS client
[client][managed] fix warnings
Merge pull request #387 from hasankhan/warnings

[client][managed] fix warnings
Merge branch 'dev' into offline

Conflicts:
	sdk/Managed/src/Microsoft.WindowsAzure.MobileServices/Http/HttpUtility.cs