Git commits in Moodle 3.1.3 by Eric Merrill

commit 937ddb9e5a53544984f1b9671817df9cb369182f
Author: Eric Merrill <merrill@oakland.edu>
Date:   Thu, 08 Sep 2016 05:13:46 +0800
Tag:    v3.1.3

MDL-55725 search: Index proper time modified with indexed files