Git commits in Moodle 2.5.7 by Andrew Nicols

commit e3fd900dcda7b603d7e0749008abd0d01290bbc3
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Tue, 27 May 2014 17:21:25 +0800
Tag:    v2.5.7

MDL-38990 mod_forum: Restrict ability to post to all groups in a forum

commit bd541d1d4cd15986712a583da2b4fe5fb5ab0f17
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Fri, 16 May 2014 13:45:30 +0800
Tag:    v2.5.7

MDL-41109 dndupload: Add missing error string

commit bc406338b7196947e509f78b7ace61077ce73fcc
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Wed, 14 May 2014 16:57:02 +0800
Tag:    v2.5.7

MDL-45536 theme: Use width auto for inputs and textareas specifying them