message: take port from command line args
diff: @@ -84,11 +84,11 @@ public:
  std::shared_ptr<wampcc::wamp_session> connect_and_logon()
  {
  std::string host = "127.0.0.1";
  - std::string port = "55555";
  +
  std::unique_ptr<wampcc::tcp_socket> sock(
  new wampcc::tcp_socket(m_kernel.get()));
  - auto fut = sock->connect(host, port);
  + auto fut = sock->connect(host, uopts.port.value());
  if (fut.wait_for(std::chrono::milliseconds(250)) !=
  std::future_status::ready)
  