Revert "ignore signals as the websocket server dies along with the Ramaze app"

This reverts commit c4d74b8ffd12d0aa508de2e074132ecbe62fa6cd.
restore websocket-server as separate process

Starting the websocket server from within app.rb was a silly idea
because a rack application server like unicorn starts the application
in multiple forked worker processes.  This means that each worker
process would spawn a websocket server thread, each trying to bind to
the websocket port.