public function setIncludeVendors($enabled = true)
    {
        if (is_string($enabled)) {
            $enabled = array($enabled);
        }
        $this->includeVendors = $enabled;

        if (!$enabled || (is_array($enabled) && !in_array('js', $enabled))) {
            // no need to call jQuery.noConflict() if we do not include our own version
            $this->enableJqueryNoConflict = false;
        }

        return $this;
    }