Add people markers and continue tweaking.
Adds markers/pins for users (using their Gravatar + a 'location pin' background image).
Moves things into /public/ instead of /www/, which seems to be an Express standard location.
Manage map markers much better (add/remove them each time to avoid duplicates).
Still need to ideally just add/move points, rather than remove/add them all.
Still getting one extra person (not merging the current user into the loaded users correctly).
Add some shadow and tweak the bubble colors to make the chat more interesting.