Added menu image to nav drawer
Hide content menus on drawer open
Fade in / out title when triggering drawer
levels: converted GraphActivity to GraphFragment
Restore fragment title on config change
State of fragments is saved / restored in MainActivity

... except for ChooseRiverFragment, which still comes up empty
after a config change.
Undid changing GraphActivity to GraphFragment

There are hardly any benefits, but a lot more work.
Proper title restoring in MainActivity
levels: removed GraphFragment
levels: slide in GraphActivity
levels: show actionbar back button
levels: removed anim from onResume and onPause

... to other places. Anim was also interacting with other apps.
Fixed NavDrawer icon not animating in MainActivity
Removed StationsListAdapter
news: added basic framework
news: minor ui improvements
about: minor ui improvements
Added bw logo to action bar
Added launcher icon for xxhdpi
new: NewsManager can send notifications