Cannot read property 'r' of undefined
This looks fantastic on the demo page but is anyone using this outside of the demo?

The simplest thing possible doesn't work for me:

```js
  render() {
    return <ChromePicker />;
  }
```

fails with

```
Chrome.js:96 Uncaught TypeError: Cannot read property 'r' of undefined
    at Chrome (Chrome.js:96)
```

which checks out looking at the source.

The documentation doesn't help. It says it should work. In fact hardly any of the documentation seems correct...

* `ChromePicker` doesn't accept a `color` arg in reality where as the docs say it does
* `ChromePicker` seems to want to want `rgb, hsl, hsv, hex` etc - hopefully I'm misunderstanding something as I expect just specifying one should be enough?

If anyone's using this for real surely surely you must have come across these issues, or have somehow avoided them. Pls help?