Git commits in Moodle 2.4.x by James Pratt

commit 5267a0519133ca447f8d56c1d2aa0eb158ede0bf
Author: James Pratt <me@jamiep.org>
Date:   Wed, 27 Nov 2013 13:49:19 +0800
Tag:    v2.4.8

MDL-43079 quiz statistics : fix stats graph when all grades zero

commit 4eff6ed9fe64229abbe4633daaa2db43ba841229
Author: Jamie Pratt <me@jamiep.org>
Date:   Tue, 02 Jul 2013 13:43:14 +0800
Tag:    v2.4.6

MDL-40388 Reset globals after each unit test

commit 304343830b4e38870d7d91325373192a4b8cce1c
Author: Jamie Pratt <me@jamiep.org>
Date:   Thu, 20 Jun 2013 14:18:42 +0800
Tag:    v2.4.6

MDL-40176 mock_submit method for testing