Support for Multi-level Nav

[bibliofille]

Just curious, is there support for a multi-level nav? I've implemented the plugin on a WordPress site I'm building, but the sub-menu for one of my nav items is getting rather long, and I'm trying to find a way to hide and show using a toggle.

[cmengler]

Seems to be work for this on the multiple-levels branch.

Viewable demo @ https://viljamis.com/responsive-nav-multiple-levels/