Git commits in Moodle 3.1.1 by sam marshall

commit 143f3624cf4be806164ea33c2579190ecd92b4ab
Author: sam marshall <s.marshall@open.ac.uk>
Date:   Tue, 14 Jun 2016 18:33:20 +0800
Tag:    v3.1.1

MDL-54920 Behat: Allow viewport size to be set consistently