Modified resources

Removed unused states for the selector.  Renamed the FrameLayout in NavDrawerActivity and changed the background color.  Changed the background color of the frame fragment.  Added to the string resources.
Improved NavDrawerActivity

Used the FrameLayout container to add an initial fragment upon starting the app.  The switchFragment method gets the selected option from the ListView and uses the String to populate a TextView in the fragment.  Implemented addToBackStack for improved workflow.