Git commits in Moodle 2.6.4 by Jenny Gray

commit 1d20e997a05c88c1ac3b4a7fa21732e247ac486e
Author: Jenny Gray <j.m.gray@open.ac.uk>
Date:   Thu, 05 Jun 2014 22:47:30 +0800
Tag:    v2.6.4

MDL-45846 Libraries custom user agent device detection unit test added

commit 807c6707656e024024f6c18b80d9f54ac3f89205
Author: Jenny Gray <j.m.gray@open.ac.uk>
Date:   Wed, 04 Jun 2014 23:10:18 +0800
Tag:    v2.6.4

MDL-45846 Libraries Reinstate custom user agent device detection