Git commits in Moodle 2.8.9 by Ferenc Lengyel

commit bfd6727b426380eec8e1277e60297f2ea0473a22
Author: Ferenc Lengyel <lengyelke@gmail.com>
Date:   Mon, 14 Sep 2015 20:23:51 +0800
Tag:    v2.8.9

MDL-51402 quiz: notification emails should respect grouping