mxnet-model-server: error: unrecognized arguments: --service

When I run

```bash
$ mxnet-model-server --models r50=r50.model ga=ga.model --service mxnet_vision_service.py --port=8080
```
The get the following error.

```bash
usage: mxnet-model-server [-h] [--start | --stop] [--mms-config MMS_CONFIG]
[--model-store MODEL_STORE]
[--models MODEL_PATH1 MODEL_NAME=MODEL_PATH2... [MODEL_PATH1 MODEL_NAME=MODEL_PATH2... ...]]
[--log-config LOG_CONFIG]
mxnet-model-server: error: unrecognized arguments: --service mxnet_vision_service.py --port=8080
```

The new `mxnet-model-server` seems do not have args named --service, so how could I use this command ?