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.
Removed dependency on MonoTouch.Dialog source; Replace MonoCross.Navigation reference with the PCL version.

Commit for Pull Request #11