/**
  * Properly set the Nova URL for assets
  * Determines if Nova is installed as a plugin, in a child theme, or a parent theme
  * and then does some calculations to get the proper URL for its CSS & JS assets
  *
  * @return string
  */
 public function set_url()
 {
     /**
      * Are we on a parent theme?
      */
     if (Nova_Toolkit::is_parent_theme(__FILE__)) {
         $relative_url = str_replace(Nova_Toolkit::clean_file_path(get_template_directory()), '', dirname(dirname(__FILE__)));
         Nova::$url = trailingslashit(get_template_directory_uri() . $relative_url);
     } elseif (Nova_Toolkit::is_child_theme(__FILE__)) {
         $relative_url = str_replace(Nova_Toolkit::clean_file_path(get_stylesheet_directory()), '', dirname(dirname(__FILE__)));
         Nova::$url = trailingslashit(get_stylesheet_directory_uri() . $relative_url);
     } else {
         Nova::$url = plugin_dir_url(dirname(__FILE__) . 'nova.php');
     }
 }