Git commits in Moodle 3.1.3 by Dani Palou

commit 95356cd73c9782df7fd1ac8b26d09d7d80a3cdbf
Author: Dani Palou <dani@moodle.com>
Date:   Mon, 19 Sep 2016 17:33:55 +0800
Tag:    v3.1.3

MDL-56019 ws: Use itemid null when getting modules intro