Made hypercube verts z-index aware

I added two lines to for giving z-index values to the verts as they were styled. The first is a var called zIndexBase setting a base z-index to work around. I used the w value since that's what you were basing the font off of, thought it's sometimes negative (thus zIndexBase).

The 3D guy in me twitched without it. If it's not to your tastes, I won't be offended. :)