Git commits in Moodle 2.7.2 by Julien Boulen

commit 1c9e079b7cebdc2aa4b7914cb1af11de0aa7992a
Author: Julien Boulen <julien.boulen@uhb.fr>
Date:   Fri, 18 Jul 2014 15:14:35 +0800
Tag:    v2.7.2

MDL-46206 Accessibility: Remove alt attribute for footer image