JMPerez/spotify-web-api-js — pull request #4 by johanbrook (2014-07-12 23:23:38+00:00)
Title: Ensure requestData.params always is an object

Otherwise, it won't be extended correctly with custom query parameters.

Below, if `requestData.params` doesn't exists, it won't be extended in `_extend`.
```javascript
_extend(requestData.params, opt);
return _performRequest(requestData, cb);
```