am d17619f6: am cd4e1c46: am f151391b: fix markup errors in action bar styling, add more information about using drawables, move \'managing the activity lifecycle\' down a notch, because it\'s less interesting.

* commit 'd17619f6df6bef8a4a18e02afb0294f75cbd56de':
  fix markup errors in action bar styling, add more information about using drawables, move 'managing the activity lifecycle' down a notch, because it's less interesting.