Some styling

So, this adds 'Skeleton', which is a grid framework. So far, I kinda hate it for all the same reasons I've hated every other grid framework (not semantic, makes DOM ugly), but I'm not sure what our options are if we want a responsive site?
Also, this adds a bunch of placeholder elements which I'm going to actually make work in the next pull request. So, I guess review but don't merge?
I guess we probably don't want to support <IE9?