Git commits in Moodle 2.7.13 by Dan Poltawski

commit c8eb9ee629e2ff5e32dc6e00b15400755d4c254f
Author: Dan Poltawski <dan@moodle.com>
Date:   Mon, 22 Feb 2016 17:11:08 +0800
Tag:    v2.7.13

weekly release 2.7.12+