Git commits in Moodle 2.6.4 by James Pratt

commit 26ae6e5792a364f2138f64afcc43ae791ed7d8e3
Author: James Pratt <me@jamiep.org>
Date:   Thu, 22 May 2014 13:10:07 +0800
Tag:    v2.6.4

MDL-42526 mod_assignment : fix record insert with assigment.id 0