Case-insensitive online user list

Modification originally posted to Google Groups by Ingrid
Merge branch 'case-insensitive-onlinelist' of https://github.com/marquisite/AJAX-Chat into marquisite-case-insensitive-onlinelist

Conflicts:
	chat/lib/class/AJAXChat.php
Merge branch 'marquisite-case-insensitive-onlinelist'