Start the daemon

def start(self, *args, **kw):
        """
        Start the daemon
        """
        # Check for a pidfile to see if the daemon already runs
        try:
            pidfile = file(self.pidfile, 'r')
            pid = int(pidfile.read().strip())
            pidfile.close()
        except IOError:
            pid = None

        if pid:
            message = "pidfile %s already exist. Daemon already running?\n"
            sys.stderr.write(message % self.pidfile)
            sys.exit(1)

        # Start the daemon
        self.daemonize()
        self.run(*args, **kw)