Git commits in Moodle 3.1.x by vpisabeywardana

commit 0a33c8ca9415b4e0b1c5b5fa0b653b6890d5efc8
Author: vpisabeywardana <vpisabeywardana@gmail.com>
Date:   Fri, 18 Mar 2016 00:00:19 +0800
Tag:    v3.1.0-rc1

MDL-52815 theme: group select overlapping issue