Git commits in Moodle 2.5.3 by Ray Morris

commit 3e90b472a02b86bf1bbe9f122c1e82ca921b8787
Author: Ray Morris <Ray.Morris@teex.tamu.edu>
Date:   Fri, 11 Oct 2013 04:05:38 +0800
Tag:    v2.5.3

MDL-42265 make Browse Users list scrollable for smaller screens