Update Charlie's 'About' (bug #503)

- It looks like the images are 85x85 px, so I've matched this with Charlie's new photo (plus a _small at 40x40, not sure if that's ever used but I made one)
- My concern is how to add a link to someone's "about" entry. I did it by making some optional hash values "url" and "urltext"
- Based on the optional hash value approach, I added a <p> and <a> that will just be empty for everyone who doesn't have a URL. Maybe we should omit these, I'm not sure what is the cleanest way to do that in Ruby.
- Also don't know if it looks the way Holly(who filed the bug #503) or <web design guru of choice> wants
- I might have screwed up line endings on the _user_span.erb file