Restored the missing 'InitializeContainer' method used by each platform's container
Updated platform specific View classes to implement the required GetModel() method.
Updated Best Sellers example for Android

Now leverages the PCL version of MonoCross.Navigation and App.
Updated Best Sellers example for WinPhone

Now leverages the PCL version of MonoCross.Navigation and App.
Updated WebKit specific View classes to implement the required GetModel() method.
Updated Best Sellers example for WebKit

Now leverages the PCL version of the Best Sellers App project