Broken material-colors API
[Material Colors](https://github.com/shuhei/material-colors) changed their es2015 API. [This line](https://github.com/casesandberg/react-color/blob/master/src/components/circle/Circle.js#L4) needs to be changed to:

```js
import * as material from 'material-colors'
```

See https://github.com/shuhei/material-colors/issues/16.