qouted argument value with other arguments in a value doesn't work

```
optparse.define short=A long=extraDockerRunArgs desc="optional, quoted string of extra docker run argument flags/values" variable=EXTRA_DOCKER_RUN_ARGS default=""
```

`mycmd.sh -A "--memory=\"256M\" --cpu-shares=\"100\""`

results in

`Unrecognized long option: --memory="256M" --cpu-shares="100"`