Git commits in Moodle 3.1.3 by Tony Lin

commit 6faa78c93569e6ea17b18c826902b8f95c260a93
Author: Tony Lin <tony.lin@open.ac.uk>
Date:   Thu, 03 Nov 2016 19:35:25 +0800
Tag:    v3.1.3

MDL-56731 groups: Fixes breadcrumb when returning to groups/index.php