Git commits in Moodle 2.4.2 by Chris Scribner

commit 53a993e103bc2a3a3764a093693e14e2446a227a
Author: Chris Scribner <scriby@gmail.com>
Date:   Tue, 24 Apr 2012 22:48:47 +0800
Tag:    v2.4.2

Fixing an issue with not sending the launch_presentation_return_url