Action bar: return default theme
support of android down to 2.1 is good, but I don't want to
Action bar: add "Search" button
Action bar: make custom actionbar background
ActionBar: change text color
ActionBar: change actionbar style
http://developer.android.com/training/basics/actionbar/styling.html
actionbar stylegenerator:
http://jgilfelt.github.io/android-actionbarstylegenerator/