Author: djarrancotleanu
MDL-60957 mod_assign: Add calendar event for extension due dates
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f6fb07be52b4a6e566fff8a096b7c426edf10092
http://github.com/moodle/moodle/commit/f6fb07be52b4a6e566fff8a096b7c426edf10092
+ 4.5 en [calendarextension,mod_assign]