Git commits in Moodle 2.5.3 by Juan Leyva

commit 119faec0546c34a8a55085adf4ed0e5140cda8ff
Author: Juan Leyva <juanleyvadelgado@gmail.com>
Date:   Thu, 31 Oct 2013 18:18:24 +0800
Tag:    v2.5.3

MDL-42617 Add support for frozen fields in searchableselector form elements