foundation-topbar-menu.php and foundation-topbar-walker.php should be required in the WordPress functions.php file.
The code in foundation-topbar.php should be added below the body tag in header.php
Setup a menu in WordPress admin under Appearance > Menus
Use the 'label' class on a menu item to create a menu section title
Foundation Top Bar Doc: http://foundation.zurb.com/docs/components/top-bar.html
Sending positive vibes - because you deserve them. Thanks for taking the time to put this together - hugely useful. @awshout