Git commits in Moodle 2.4.5 by Sam Chaffee

commit 4417a705cf9e410ac1ed32c982f592c6720da4c8
Author: Sam Chaffee <sam@moodlerooms.com>
Date:   Fri, 21 Jun 2013 03:54:03 +0800
Tag:    v2.4.5

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