Updated mediawiki/extensions
Project: mediawiki/extensions/MediaWikiChat  77e04906935ebeed0d37c53b54a707774a184df0

Hide the join link in sidebar if user is in chat

Also add config var $wgChatOnlineTimeout for setting the timeout before a
user is considered offline

Change-Id: If6997624eeb4e09ace9e672257f2270dd3281101