Git commits in Moodle 2.8.4 by Tony Butler

commit 7c0e5b20b66bca444b9ed89ba2c6127a67966278
Author: Tony Butler <tonyjbutler@gmail.com>
Date:   Fri, 20 Feb 2015 23:21:54 +0800
Tag:    v2.8.4

MDL-49075 mod_assign: Add assertions to marking workflow unit test

commit bb790b84ca9d3cb8fbf6ec96b85cdb655a32059c
Author: Tony Butler <tonyjbutler@gmail.com>
Date:   Tue, 17 Feb 2015 22:56:38 +0800
Tag:    v2.8.4

MDL-49075 mod_assign: Keep unreleased assign grades out of gradebook