Git commits in Moodle 2.8.3 by Dan Poltawski

commit 1dcf25db8b3cac0da4ecb3a22962e9f893759680
Author: Dan Poltawski <dan@moodle.com>
Date:   Thu, 15 Jan 2015 00:59:46 +0800
Tag:    v2.8.3

MDL-46976 user: trim whitespace from input email address

commit fa01f2b45aa28bdeba4e52c4f8f4da8fa69935b7
Author: Dan Poltawski <dan@moodle.com>
Date:   Wed, 31 Dec 2014 23:12:34 +0800
Tag:    v2.8.3

MDL-35155 dml: add unit test which exposes substr problem

commit 15252c8803c8435f13f25bdc7093ddd6c9c509cb
Author: Dan Poltawski <dan@moodle.com>
Date:   Wed, 31 Dec 2014 00:45:36 +0800
Tag:    v2.8.3

MDL-41166 assign: don't display portfolio button when no permissions