[Ch22 - update] Fragment callback interfaces

Added:
+ Master and detail now wired up
+ Added Callbacks interface
+ Hosting activity now implements Callback method
[Ch22 - complete] onCrimeUpdate CallBack added

Added:
+ Callback methods on CrimeFragment to update Master UI upon changes
made in Detail view

Bugs:
+ Delete menu item no longer deletes the crime from the ListView
+ ContextMenu Deletion does not function
+ Delete menu item causes app to crash [!!! - Please investigate!]