Git commits in Moodle 3.1.x by John Beedell

commit e251d9fe4590f49dec804cdf4358f49b9f6d7423
Author: John Beedell <john.beedell@open.ac.uk>
Date:   Thu, 03 Nov 2016 01:25:54 +0800
Tag:    v3.1.3

MDL-54986 Quiz: Disable add button for quiz with attempts

commit 26d38b03cdca7e656ff8925387e02e17dee0258c
Author: John Beedell <john.beedell@open.ac.uk>
Date:   Tue, 25 Oct 2016 21:57:08 +0800
Tag:    v3.1.3

MDL-55930 Quiz: "Next page button" showing in sequential mode

commit 04c6fd9498a211e4789b5e334d1679084d785363
Author: John Beedell <john.beedell@open.ac.uk>
Date:   Thu, 08 Sep 2016 23:17:07 +0800
Tag:    v3.1.3

MDL-55911 Quiz: Accessibility, Label blanks in DD questions