Git commits in Moodle 3.0.0 by Bence Laky

commit 933f0d966e8291a212fdcfa39b7679a7a2166d1f
Author: Bence Laky <b.laky@intrallect.com>
Date:   Thu, 01 Oct 2015 21:21:22 +0800
Tag:    v3.0.0-beta

MDL-51578 enrol_self: Improved error message on late/early enrolments