public function deleteDatabase($site, $db, $backup = TRUE)
{
$variables = array('site' => $site, 'db' => $db, 'backup' => $backup ? 1 : 0);
$request = $this->delete(array('{+base_path}/sites/{site}/dbs/{db}.json?backup={backup}', $variables));
return new Response\Task($request);
}