Update Xamarin.iOS quickstart: add offline support, minor UI changes
Updated Xamarin.Android quickstart: add offline support
Windows C# quickstart: add commented-out code for adding offline support
Xamarin Android quickstart: add link to conflict handling tutorial
Xamarin.iOS quickstart: add comment & URL for info on conflict handling
Remove progress spinner from Xamarin.Android quickstart
Remove progress indicator from Xamarin.iOS quickstart
Update Xamarin.iOS quickstart to always sync after local edits
Update Xamarin.Android quickstart to sync after local edits
Update Xamarin.Android quickstart nuget references to 1.3 final.
Update Windows quickstart to 1.3 SDK; sync after each edit
Update Xamarin.iOS quickstart reference to SDK 1.3 final.
Merge pull request #513 from lindydonna/dev

Update Xamarin and Windows quickstarts