Git commits in Moodle 3.1.1 by Steve Bader

commit 782aa36c344a4946887d4d665dfaac3ec6aae0bb
Author: Steve Bader <smbader@ncsu.edu>
Date:   Tue, 26 Jan 2016 00:56:51 +0800
Tag:    v3.1.1

MDL-49852 mod_assign: Fix group assignment completion tracking