Added Components/* to .gitignore for Xamarin projects
Removed redundant AssemblyProduct assembly attributes in Xamarin projects
Android Samples app now has an AndroidManifest.xml file by default
iOS Project now references the Newtonsoft.Json component from the Xamarin Component store.  Also updated iOS to use the __IOS__ standard preprocessor directive (still needs to be defined in the project for Visual Studio users, but exists already for Xamarin Studio users).
Android project now uses Newtonsoft.Json component from the Xamarin Component Store
No longer need Android or iOS specific Newtonsoft.Json.dll libraries in the lib folder as they are referenced as Xamarin Component Store components now in their respective projects