add alternate aliases for the Connection classes
add multicast adapter for testing, refactor transport and connect (make transport a member of the connection rather than a superclass), fix problems with heartbeat timeout (github issue: https://github.com/jasonrbriggs/stomp.py/issues/4)
update changelog
fix missing return on get_listener method
update version and changelog
fix minor bug with backward uuid func, add get_errno for backwards-compatible errno handling, tidy up reference to connection-closed error num, fix minor issue with listener return values