Fixing some imports and stuff

Made it possible to have multiple windows open to the same comet server at the same time.

Fixed Alex's broken runcomet changes

Make the proxy run on the normal port

Calling it HURRICANE_CURSOR

Use window.BEGINNING_CURSOR

Respect a BEGINNING_CURSOR variable if it exists

Ensure that UserAwareCometHandler is imported in __init__

Give the UserAwareCometHandler a way to remove users with invalid sessions from the pending requests dictionary

Refactored CometHandler a little bit and created UserAwareCometHandler

Added back the runcomet because it's convenient

Removed runcomet and created runhurricane and hurricaneproxy

Whoops, remove the commented-out lines

Fixed the runcomet script

Fixed some dumb stuff