Git commits in Moodle 2.5.5 by Andrew Davis

commit 3d7810ab3d67a423a760ba89ae75de81d940b236
Author: Andrew Davis <andrew@moodle.com>
Date:   Mon, 03 Mar 2014 12:15:54 +0800
Tag:    v2.5.5

MDL-44082 mod_chat: added a security check for users already in the chat activity

commit 71c3354beda3b7e8fba9ba6c6462e463b421f07a
Author: Andrew Davis <andrew@moodle.com>
Date:   Fri, 17 Jan 2014 07:32:12 +0800
Tag:    v2.5.5

MDL-43671 message: removed an overly cautious check