Remove images from client on disconnect.

I would love a little review here, because it's all late and stuff :baby_bottle: :baby_bottle: :baby_bottle: 

Specifically the change to model.js I feel weird about. I'm wondering why when players are deleted on disconnect on the server, why the heck the data.players[id] is an empty object. Kind of strange.

Wevs :heart_decoration: :hear_no_evil: :fork_and_knife: