Git commits in Moodle 2.9.4 by Adrian Greeve

commit baddb058a9a7a25a49d697b13e2d151a3b40643f
Author: Adrian Greeve <adrian@moodle.com>
Date:   Tue, 09 Jun 2015 14:06:42 +0800
Tag:    v2.9.4

MDL-37308 files: convert_image() now supports transparency.