Fix #2: Display time and control buttons in notification.

 - Extend the foreground service notification to display time and action buttons.
 - Add new libZeitmesser version.
Update gradle properties.
Improve notification.

 - Add new Icons.
 - Reset command of notification is handled by MainActivity.
 - Use lock to prevent update after cancellation.
Keep old icon for pre ICS versions.
Merge branch 'ntfyctnctrl' into develop