Git commits in Moodle 2.5.1 by Ashley Holman

commit e9efc2baa2377ef811a5b6f382f003c6ab1aba4e
Author: Ashley Holman <ashley@netspot.com.au>
Date:   Wed, 29 May 2013 11:57:33 +0800
Tag:    v2.5.1

MDL-39743 assign: Fix missing capability check for "grant extension"