move track colors and backgrounds into product flavors
Change project to use AppCompat v7

Change minSDK version to 14 (needs PreferenceFragment)
Remove v11 styles
Replace all references to ActionBarSherlock
Replace PreferenceActivity

Instead use a PreferenceFragment since AppCompat does not contain
a PreferenceActivity.
Add a general PreferenceCategory to get consistent layout
Reformating, add scrollBarStyle 'outsideInset'
xml reformating