new chat room

Because the previous chat module left many, many... many things to be desired, I've decided to go with a hosted chat solution, Web 2.0 style, from Lingr. It's pretty intuitive, but here are two useful tips on using it:

- You'll have to enter a chat nickname when you arrive
- To send someone a private message, just click their name

Everything else was pretty obvious to me, but check out their help section or just shoot me a message if you have any trouble using it.