Hoist .answer style to use in more contexts (ie, on round and puzzle pages).
Split top half of round/puzzle pages to make room for chat.

Also add puzzle answers to round pages.  Closes #48.
Add chat log to top-right corner of round/puzzle pages.

No way to write chat messages (yet) and presence is probably not quite
working yet.  But it's a start...
Add message input box to top-right corner chat widget.