'BSUsageTrackerRegisterCollectors': Register your extension's usage collector here.
$aCollectorsConfig: description of the collector. Must be an instance of
BS/UsageTracker/Collectors/Base. Example:
		$aCollectorsConfig['bs:blog'] = array(
			'class' => 'Property', // Tag, Database
			'config' => array(
				'identifier' => 'tag:bs:blog'
			)
		);