Revert "Give the drawer background more definition instead of just a solid color."

This reverts commit 49df5b792d81eeaefaa494a1d483444aaa588de3.
Revert "Introducing the PreferenceDrawerActivity which makes use of the new navigation drawer UI google has introduced in updates to many of their apps.  This relies on headers which are displayed in the drawer and preference fragments as the main content."

This reverts commit 46f8a3877be5bab8a897ba1aacc0f0815986bff8.
Revert "Add DrawerLayout and ViewDragHelper classes found in the new support library.  These classes have been modified to work with the current framework and no need for any support or compat classes."

This reverts commit f3c9b4851a4150eb0c176b29805125b064ca9c4a.