Git commits in Moodle 2.8.4 by Sara Cenni

commit 64732078885c701c63d5faadc0d9d5e3fecd8376
Author: Sara Cenni <sara.cenni@unibo.it>
Date:   Tue, 10 Feb 2015 18:52:02 +0800
Tag:    v2.8.4

MDL-40776 grade: fix query for report outcomes