Marc Lands on the Planet

I’ve added Marc to the planet. He’s currently teaching English in Korea and hopefully has a lot to teach us as well.

While I was at it, I fixed the generated HTML code to not use invalid characters in HTML ids. It seems you can’t have any of ,/?=. I just replace them with colons for now. So as long as the component feeds are valid HTML 4.01 Transitional, we should validate nicely.