Developer credits
Git commits in Moodle 2.2.4 by Marina Glancy
commit c0cea70f0b5a4356dff7149151a5ebce30c3ed10 Author: Marina Glancy <marina@moodle.com> Date: Wed, 27 Jun 2012 10:05:12 +0800 Tag: v2.2.4 MDL-34047 repository URL downloader must say that it returns only images