The latest upgrade from 0.4.6 - 0.4.7 is not compatible with react 0.14.x

The following error shows up in the browser console:

```
react-treeview.js:19 Uncaught TypeError: Super expression must either be null or a function, not undefined
    at _inherits (react-treeview.js:19)
    at react-treeview.js:30
    at Object._typeof (react-treeview.js:104)
    at __webpack_require__ (bootstrap f721391…:19)
...
```