Implement option to opt out of console report

By default, a report is sent to the console (“Parsed Items: #” for `.parse()`; “File saved” for `.write()`). You can pass a second argument `false` to bypass this behavior. Like so:
```javascript
var json = csv.parse('path/to/file', false);
csv.write('path/to/file', false);
```

This patch doesn’t break expected behavior. If no second argument is passed, module behaves as before (reports to the console as usual).
could this be passed down through an json option? like
```json
{
   "console": false
}
```