This is a repo of code I edited from Understanding the Walker Class | Wptuts+ http://goo.gl/m3iTY to work with my current version of Wordpress
Originally written by Stephen Harris on May 14th 2012 for Tutsplus.com
First of all we don’t want to display top-level parents. Recall that the function responsible for the opening <li> tag and the link is start_el and the function responsible for the closing </li> tag is end_el. We simply check if we are at the parent level. If we are, we don’t do anything. Otherwise, we continue ‘as normal’ and call the function from the Walker_Nav_Menu class.