Git commits in Moodle 3.1.2 by Jake Dallimore

commit 4f424b7b0c1f7a516a52ea02ae0ebc4c34b8c008
Author: Jake Dallimore <jake@moodle.com>
Date:   Mon, 15 Aug 2016 14:19:35 +0800
Tag:    v3.1.2

MDL-55565 core_backup: Fix warning when restoring question categories

commit 8c42211e3f9e4368d64327e7b983286fca0b6fee
Author: Jake Dallimore <jake@moodle.com>
Date:   Fri, 05 Aug 2016 10:34:22 +0800
Tag:    v3.1.2

MDL-50803 login: Remove token from URL in forgot password process

commit 9e6ed38418090e71d06596bcecabc599bb288f7c
Author: Jake Dallimore <jake@moodle.com>
Date:   Mon, 25 Jul 2016 11:56:43 +0800
Tag:    v3.1.2

MDL-55322 assignfeedback_editpdf: Prevent scroll when moving comments