The 'disconnected' event is normally fired from connection_lost(), which
is called by the connection code when the connection is lost after being
established. However, if the connection wasn't successfully established,
a manual /reconnect no-ops because it waits for the 'disconnected'
callback which never fires. This patch does two things:
1. Immediately fire a 'disconnected' event in disconnect() if there is
no transport.
2. Register the 'disconnected' event handler in reconnect() *before* it
can be fired.
d85efec7a2