Git commits in Moodle 3.1.x by Greg Faller

commit 3eb931d3650f92853837dffbb5fc3a7120936f11
Author: Greg Faller <greg.faller@flinders.edu.au>
Date:   Thu, 14 Jan 2016 09:11:15 +0800
Tag:    v3.1.0-beta

MDL-50083 mod_assign: unlock submission when adding attempt