Author: Dmitrii Metelkin
MDL-65622 core: add grade_item_created event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=657cc33be935ea1360b63685ee7b024bfb5ef4a8
http://github.com/moodle/moodle/commit/657cc33be935ea1360b63685ee7b024bfb5ef4a8
+ 3.8 en [eventgradeitemcreated,core_grades]