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 ;
}
```

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?

Start with the standalone reproduction and inspect Chrome.js around line 96, then compare the component behavior with the documented props. Verify the reported runtime failure and whether the color prop and accepted color formats are accurately documented; done means the minimal example works or the required usage is clearly documented.

Written by the indexing model from the issue text.