Git commits in Moodle 3.3.1 by Andres

commit 6fc4a6c17aea7f95705409f86de4338192a6ab0c
Author: Andres <andres.torres@blackboard.com>
Date:   Fri, 19 May 2017 11:32:59 +0800
Tag:    v3.3.1

MDL-46322 mod_assign: Only list enrolled graders as potential markers