Author: Adrian Greeve
MDL-43294 events: New Event for essay submission in lesson.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f577148266bdf63769dc156ed1e33c0933000c89
http://github.com/moodle/moodle/commit/f577148266bdf63769dc156ed1e33c0933000c89
+ 2.7 en [eventessayassessed,mod_lesson]