Git commits in Moodle 3.1.1 by Russell Smith

commit 9b1232cb59af6f41e832228d84fb3824e929069d
Author: Russell Smith <mr-russ@smith2001.net>
Date:   Tue, 21 Jun 2016 06:31:26 +0800
Tag:    v3.1.1

MDL-54881 quiz: Ensure user attempts are deterministic for testing.