Exception when moving to the lastest version (1.2.1 to 1.3.7)
Hi, I was updating our dependencies. We have a new exception each time we render a ColorPicker:

> Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components). Check the render method of 

This is React 0.14.7

Code: 

```
var ColorPicker = require('react-color');

<ColorPicker
                    type             = "sketch"
                    position         = "below"
```

Since ColorPicker is an object. By checking it, I found a workaround:  <ColorPicker.default , which is a function and work as expected.

I wonder if we are doing something wrong.

Thanks.
