First pass at removing the spans using the Kellum method

Looks like actually getting rid of the spans for good is going to be a manual pass at all 213 (well, 212 now) of the old designs.

If the spans were just used for image replacement, it's easy. Just delete the span rule (display:none and all) and add the Kellum method to the parent. Done. (http://www.zeldman.com/2012/03/01/replacing-the-9999px-hack-new-image-replacement/)

PR for the sake of exposing that this is happening, and maybe getting some help?