function $routeEventListener(event, current, prev) {
        // Removes previously added css rules
        if (prev) {
          $css.remove($css.getFromRoute(prev).concat(dynamicPaths));
          // Reset dynamic paths array
          dynamicPaths.length = 0;
        }
        // Adds current css rules
        if (current) {
          $css.add($css.getFromRoute(current));
        }
      }
Listen for route change event and add/remove stylesheet(s)