Git commits in Moodle 2.8.4 by Adrian Greeve

commit bec8c20caba8e06648e389b94283c77d7c6b3920
Author: Adrian Greeve <adrian@moodle.com>
Date:   Tue, 27 Jan 2015 14:23:41 +0800
Tag:    v2.8.4

MDL-48038 mod_tag: Unit tests for tag cron functions.

commit 3359719ce95e978799771c8ad6f825d5a7e42803
Author: Adrian Greeve <adrian@moodle.com>
Date:   Tue, 27 Jan 2015 12:52:32 +0800
Tag:    v2.8.4

MDL-48038 mod_tag: Improvement of tag cron.