Git commits in Moodle 2.8.8 by Ankit Agarwal

commit 20ff15e22b4f0abebe1ab5fbfd1d681c88765e2a
Author: Ankit Agarwal <ankit@moodle.com>
Date:   Mon, 08 Jun 2015 17:03:26 +0800
Tag:    v2.8.8

MDL-50173 ratings: Use proper checks to ensure ratings are viewable.