Fix escaped strings getting set in db

Currently running something like this:

```js
wp.option.update('blogdescription', "A new tagline", function(err, data) {
	console.log("Tagline/description set.");
});
```

can result in the string `A\ new\ tagline` being set in the database.  Wrapping the values of the args in double quotes when creating the cli args fixes this.