Git commits in Moodle 2.9.0 by Andrew Hancox

commit baba473b24987e38453609de1a52c60f129a451b
Author: Andrew Hancox <andrewdchancox@googlemail.com>
Date:   Thu, 02 Apr 2015 20:03:37 +0800
Tag:    v2.9.0-rc1

MDL-42449 backup: Fix for activity grade category

commit 6398ff538763defce3c20263c381b38a37150537
Author: Andrew Hancox <andrewdchancox@googlemail.com>
Date:   Tue, 17 Mar 2015 17:28:16 +0800
Tag:    v2.9.0-beta

MDL-49101 core: Add a global admin setting config->requiremodintro

commit e528997a4a3855d7c3e38f9a8d691fe1b1482661
Author: Andrew Hancox <andrewdchancox@googlemail.com>
Date:   Fri, 13 Mar 2015 19:23:35 +0800
Tag:    v2.9.0-beta

MDL-48159 mod_assign: Added setting preventsubmissionnotingroup