Git commits in Moodle 2.5.3 by Michael de Raadt

commit 23288150aa4d1ec16ca154d1517506383481f221
Author: Michael de Raadt <michaeld@moodle.com>
Date:   Tue, 29 Oct 2013 14:38:48 +0800
Tag:    v2.5.3

MDL-41092 assign: Fix duplicate key error in assign cron

commit 8fac075a5c3a4f8d4e12a971baa7891c4d9bac38
Author: Michael de Raadt <michaeld@moodle.com>
Date:   Fri, 25 Oct 2013 09:01:21 +0800
Tag:    v2.5.3

MDL-42491 libraries: add exception for IE11 (and hopefully later versions)

commit 00a3eed3065a75da4af242a87ad7b102c5c36aae
Author: Michael de Raadt <michaeld@moodle.com>
Date:   Fri, 26 Jul 2013 15:50:26 +0800
Tag:    v2.5.3

 MDL-23335 mod_forum: allow multi-lang filtering of shortened messages