Git commits in Moodle 2.3.1 by Aaron Barnes

commit 2670a3a6849b552479469043fec3d5a0e9c9e22f
Author: Aaron Barnes <aaronb@catalyst.net.nz>
Date:   Wed, 27 Jun 2012 06:38:24 +0800
Tag:    v2.3.1

MDL-34044 completion: Fix regression caused by MDL-26626

commit 9b57d5bc38fb4295c237f634ecb8c0960d2fd1b1
Author: Aaron Barnes <aaronb@catalyst.net.nz>
Date:   Wed, 11 Apr 2012 14:54:40 +0800
Tag:    v2.3.1

MDL-32249 completion: Make grade criteria more consistent