Git commits in Moodle 2.8.8 by Adam Riddell

commit 2e3bc53fb30d7817b19667f6401976f322a810bc
Author: Adam Riddell <adamr@catalyst-au.net>
Date:   Wed, 08 Jul 2015 13:28:55 +0800
Tag:    v2.8.8

MDL-50800 question: Add missing make_answer method