Rewrite

This is a full rewrite from the ground up of a accessible mega menu
style navigation system. It is also responsive, in that it condenses
down into a left menu.
Based on adobes accessible mega menu, but removed dependencies with js,
removed all css and build from the ground up. What is still remnant of
the adobe code is the general html markup for the menus themselves.
accessibility

tweaked states.
added javascript :focus support for keyboard navigation!
visuals

moved hover states to global css area
removed states from devices
added shadows to windows for depth.
Merge pull request #3 from gregdaynes/Mega-Menu-Rewrite

Mega Menu