/**
* Creates a link element for CSS stylesheets.
*
* @since version 0.85
*
* @param $url String of javascript file to include
* @param $options Array of HTML attributes.
*
* @return string CSS link tag
**/
static function css($url, $options = array())
{
if (!isset($options['media'])) {
$options['media'] = 'screen';
}
return sprintf('<link rel="stylesheet" type="text/css" href="%s" %s>', $url, Html::parseAttributes($options));
}