Git commits in Moodle 2.3.8 by Sam Chaffee

commit 4010b2205158e81d17dc66068273ee60f1d62c2e
Author: Sam Chaffee <sam@moodlerooms.com>
Date:   Fri, 21 Jun 2013 03:54:03 +0800
Tag:    v2.3.8

MDL-40258: Fixed invalid json string error in file-picker