Git commits in Moodle 2.3.9 by Tim Hunt

commit 9bf7f1083404519de56e3764e47596f13a663b59
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 12 Jul 2013 18:41:12 +0800
Tag:    v2.3.9

MDL-40633 filter_urltolink breaking some image links.