add optional withAttn option in request or server
add optional withAttn option in request or server

da03/OpenNMT,monsieurzhang/OpenNMT,OpenNMT/OpenNMT,monsieurzhang/OpenNMT,da03/OpenNMT,OpenNMT/OpenNMT,jsenellart/OpenNMT,jungikim/OpenNMT,OpenNMT/OpenNMT,jsenellart-systran/OpenNMT,monsieurzhang/OpenNMT,da03/OpenNMT,jungikim/OpenNMT,jsenellart-systran/OpenNMT,jungikim/OpenNMT,jsenellart-systran/OpenNMT,jsenellart/OpenNMT,jsenellart/OpenNMT