ActionBarListActivity: Add missing support for empty view in ListView
show changes dialog in onResume, not (only) onCreate
Fix for NPE on empty lecture list
Move reloading of the alarms after deletion to the AlarmList

This fixes the alarm markers not being refreshed in the schedule
view after exiting the AlarmList via up navigation in which case
the MainActivity is restarted and onActivityResult not being called.
Make automatic updates the default behaviour
add NoActionBar style
Update notice on used libraries (ActionBarSherlock -> AppCompat)
Change ChangesDialog to use standard dialog, highlight the
schedule version
Remove obsolete notification icons
Use Toolbar for preferences to align content with Toolbar title
adjust colors for about dialog
change position of changes list action in menu
Use Toolbar and ProgressBar on MainActivity
Build accentColor ids for event boxes
Adjust icons in event box to baseline
Change Bell/Camera icons to white to 31C3 theming
Use Toolbar on ChangesListActivity
ChangesList: Add header to list, adjust paddings/margins
Change base colors for 31C3
Change colors for 31C3 track names, add accent colors for normal/highlighted state