New features and improvements are
. Added edit, delete menu.
. Fixed Force Close (SecurityException: Requires VIBRATE permission)
. Fixed Force close (StringIndexOutOfBoundsException)
(Rarely happening in class export)
. Fixed Force close (IllegalStateException: database not open)
(Rarely happening when class is updated)
. Fixed CSV file export with email problem.
. Added Edit/delete menus for Term, Course and Class
. Revised sample data
. Added more themes
