Fix: Made ReleaseTodaySchedulerReceiver static so it can be instantiated when called by Android
In released today notification: Nusic icon is only set as icon (not as large icon) in order not to show the icon twice in each notification (large icon on the left and an additional small icon on the right)
Implemented preference for enabling new releases notifications
Fix: Released Today service is now checks on startup if it was disabled in preferences. If so, stops the schedule.