Updated Referneces for MonoCross.Touch, removing MonoTouch.NinePatch

Includes utilizing new MonoCross.Navigation Portable Class libary
version, and replacing MonoTouch.Dialog source with MonoTouch.Dialog
included with MonoTouch/Xamarin.iOS
Updated the Best Sellers references.

This reflects the changes to MonoCross.Touch by switching to the
Portable Class Library version of  MonoCross.Navigation. In addition,
NinePatch was removed.