Git commits in Moodle 2.8.3 by Ray Bon

commit 54ea4bee350eb1d736fc1a7494172c583840b787
Author: Ray Bon <rbon@uvic.ca>
Date:   Wed, 14 Jan 2015 15:05:11 +0800
Tag:    v2.8.3

MDL-48837 phpunit: Restore system default timezone