Git commits in Moodle 2.4.6 by Eloy Lafuente (stronk7)

commit 178af4770e250504a307e5985158d039c15c1026
Author: Eloy Lafuente (stronk7) <stronk7@moodle.org>
Date:   Fri, 06 Sep 2013 17:20:19 +0800
Tag:    v2.4.6

MDL-41623 ensure all links are valid urls