Author: Thong Bui
MDL-76797 core_role: Add create role event class
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5db011a6009bc111616fa62c0d017f700b8d42e9
http://github.com/moodle/moodle/commit/5db011a6009bc111616fa62c0d017f700b8d42e9
+ 4.2 en [eventrolecreated,core_role]