Git commits in Moodle 2.7.15 by Eloy Lafuente (stronk7)

commit cd48d26b5a10163bfc0a408c8ea6ba4ac4417536
Author: Eloy Lafuente (stronk7) <stronk7@moodle.org>
Date:   Fri, 01 Jul 2016 19:44:36 +0800
Tag:    v2.7.15

MDL-53019 environment: 3.2 requirements added