function downloadPiwikTracker()
{
$path = PIWIK_INCLUDE_PATH . '/libs/PiwikTracker/';
$filename = 'PiwikTracker.php';
Common::sendHeader('Content-type: text/php');
Common::sendHeader('Content-Disposition: attachment; filename="' . $filename . '"');
return file_get_contents($path . $filename);
}