Git commits in Moodle 2.6.4 by Sam Chaffee

commit 464280a23d79c1c6fd6a92a1e23f1d1d33b410e4
Author: Sam Chaffee <sam@moodlerooms.com>
Date:   Thu, 01 May 2014 01:55:57 +0800
Tag:    v2.6.4

MDL-45767: Fixed DB error when returning to course from external tool