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

This reverts commit 63e55f4312ce8c6a0dae0863aea4f30d5bd1c210.
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 424b8c69459d56635dd88e20016c105d2139a04b.
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 f54ea53031559e791be72077ea1756d6ea85a73b.