_merge2.default.recursive is undefined in react-color webpack setup
Attempted to include react-color in my project today, but I've encountered the following error:

`TypeError: _merge2.default.recursive is undefined`

This occurs in the resulting webpack bundle, using only a very simple component (source is below). I'm not entirely sure whether this is an issue with react-color or webpack, so apologies if this is posted in the wrong place. Everything else within my webpack setup works as intended.

I'm using this in a Rails environment using the react-rails gem, so the component is mounted in the following way: 

`ReactDOM.render(React.createElement(window.ColorSelector), document.getElementById("colorselector"));`

The above snippet on its own reproduces the error. Any advice on further debugging the issue would be greatly appreciated.

Source of the error (ugly webpack output)
`"use strict";function _interopRequireDefault(e){return e&&e.__esModule?e:{"default":e}}Object.defineProperty(exports,"__esModule",{value:!0});var _merge=__webpack_require__(271),_merge2=_interopRequireDefault(_merge),_lodash=__webpack_require__(266),_lodash2=_interopRequireDefault(_lodash),merge=function(e){return _lodash2["default"].isObject(e)&&!_lodash2["default"].isArray(e)?e:1===e.length?e[0]:_merge2["default"].recursive.apply(void 0,e)};exports["default"]=merge;`

Stack trace from Firefox:

```
TypeError: _merge2.default.recursive is undefined
merge()
exports.combine()
module.exports()
exports.ReactCSSComponent</<.value()
exports.ReactCSSComponent</<.value()
render()
ReactCompositeComponentMixin._renderValidatedComponentWithoutOwnerOrContext()
ReactCompositeComponentMixin._renderValidatedComponent()
ReactPerf.measure/wrapper()
ReactCompositeComponentMixin.mountComponent()
ReactPerf.measure/wrapper()
ReactReconciler.mountComponent()
ReactCompositeComponentMixin.mountComponent()
ReactPerf.measure/wrapper()
ReactReconciler.mountComponent()
ReactCompositeComponentMixin.mountComponent()
ReactPerf.measure/wrapper()
ReactReconciler.mountComponent()
ReactMultiChild.Mixin.mountChildren()
ReactDOMComponent.Mixin._createContentMarkup()
ReactDOMComponent.Mixin.mountComponent()
ReactReconciler.mountComponent()
ReactCompositeComponentMixin.mountComponent()
ReactPerf.measure/wrapper()
ReactReconciler.mountComponent()
ReactCompositeComponentMixin.mountComponent()
ReactPerf.measure/wrapper()
ReactReconciler.mountComponent()
mountComponentIntoNode()
Mixin.perform()
batchedMountComponentIntoNode()
Mixin.perform()
ReactDefaultBatchingStrategy.batchedUpdates()
batchedUpdates()
ReactMount._renderNewRootComponent()
ReactPerf.measure/wrapper()
ReactMount._renderSubtreeIntoContainer()
ReactMount.render()
ReactPerf.measure/wrapper()
```

Component source:

```
import React from 'React';
import { CompactPicker } from 'react-color';

/**
 * Basic color selector component.
 */
class ColorSelector extends React.Component {
  render() {
    // Component code
    return (
      <CompactPicker />
    );
  }
}

export default ColorSelector;
```
