Git commits in Moodle 2.8.4 by Dan Poltawski

commit 2abfecbc8c1bfd7d5d4e51934d17a7b4206e9db6
Author: Dan Poltawski <dan@moodle.com>
Date:   Wed, 25 Feb 2015 22:57:39 +0800
Tag:    v2.8.4

weekly release 2.8.3+

commit 96dc38c46a6c23c3b321a838cb99b6169fdb7d4d
Author: Dan Poltawski <dan@moodle.com>
Date:   Thu, 05 Feb 2015 18:07:22 +0800
Tag:    v2.8.4

weekly release 2.8.3+

commit 4151d0aa1f982671ecaffc5a5e9bc860a8f3f29e
Author: Dan Poltawski <dan@moodle.com>
Date:   Tue, 03 Feb 2015 19:02:20 +0800
Tag:    v2.8.4

MDL-48624 behat: fix trailing whitespace

commit 89b92ecbb9e434619e5ca2af9ea144dca5da1bac
Author: Dan Poltawski <dan@moodle.com>
Date:   Sat, 24 Jan 2015 00:02:49 +0800
Tag:    v2.8.4

MDL-48960 output: use nofollow attribute to stop crawling invalid links