Git commits in Moodle 2.7.5 by Ray Bon

commit 8705f0f9eac37d79b8aaabe1a9f995c0c37c5d91
Author: Ray Bon <rbon@uvic.ca>
Date:   Wed, 14 Jan 2015 15:05:11 +0800
Tag:    v2.7.5

MDL-48837 phpunit: Restore system default timezone