Allow passing of extra options with addAsyncValidator function

You can pass in your remote options through the addAsyncValidator function, instead of using the 'data-parsley-remote-options' attribute on the field.

```javascript
$('[name="q"]').parsley()
  .addAsyncValidator('mycustom', function (xhr) {
    return 404 === xhr.status;
  }, 'http://mycustomapiurl.ext', 
     { "type": "POST", "dataType": "jsonp", "data": { "token": "value" } } 
  );
```