Support timeout on ssl connection

Hi,

When TLS handshake hangs, handleConnection process is waiting so long.
reference: https://github.com/golang/go/issues/17708

I would like to setting timeout on ssl connection.
change quickfix/initiator.go line 139 to
```golang
tlsConn, err := tls.DialWithDialer(&net.Dialer{Timeout: 15 * time.Second}, "tcp", address, tlsConfig)
```

What do you think about it?