Git commits in Moodle 3.0.0 by Clement Smith

commit 8c0b46f74fd22bd4642b76e63b6119e489622e5f
Author: Clement Smith <cdsmith@umn.edu>
Date:   Thu, 30 Jul 2015 22:00:26 +0800
Tag:    v3.0.0-beta

MDL-50963 lang/en/grades.php: Improve bad grade error message


commit 368c1bb6744a1fa9928aa620b25d3461a78c7e10
Author: Clement Smith <cdsmith@umn.edu>
Date:   Thu, 30 Jul 2015 20:44:42 +0800
Tag:    v3.0.0-beta

MDL-50957 grade/report/user: Fix division by zero