Developer credits
Git commits in Moodle 2.3.9 by Eloy Lafuente (stronk7)
commit 090a5f635d8061d5cda0c6e3f99dd4fab7e10094 Author: Eloy Lafuente (stronk7) <stronk7@moodle.org> Date: Fri, 06 Sep 2013 17:20:19 +0800 Tag: v2.3.9 MDL-41623 ensure all links are valid urls