!reset_objective is broken

Error is:

```
ReferenceError: args is not defined
    at Object.ResetObjective.Execute (**removed**\node_modules\smelt-cli\plugins\reset_objective.js:20:2)
```

Need to change this:

```
    // Remove name and criteria from args.
    args.shift();
    args.shift();
```

to this:

```
    // Remove name and criteria from args.
    smelt.args.shift();
    smelt.args.shift();
```
