EditableInput with focus doesn't change value
Hey @casesandberg 

I found a potential bug on `EditableInput`. When EditableInput is focused and you drag a Saturation or a Hue, the value doesn't change.

I create a small [demo](https://n53766998j.codesandbox.io). You can edit it here: https://codesandbox.io/s/n53766998j

Just trying to debug the problem seems that if you change it by a normal `input` this "bug" disappear.

The problem may be that the EditableInput doesn't receive new props and doesn't trigger 
`componentWillReceiveProps`: https://github.com/casesandberg/react-color/blob/master/src/components/common/EditableInput.js#L14.

and btw, thanks for react-color, it's anwesome lib!