Install dependencies described in releases

Follows the same train of though as #1.

I think it would be nice if in the provided [`releases`](https://github.com/jfmengels/lib-upgrader/blob/master/sample/releases.json) array, we added support for additional dependencies to install (maybe even remove?).

``` json
[{
"version": "0.14.0",
"dependencies": [
"react-dom@^0.14"
],
"transforms": [
"path/to/transorm/a.js",
"path/to/transorm/b.js"
]
}]
```

For instance, in React v0.14, the module was split into two separate modules: `react` and `react-dom`. A similar thing happened with `Babel` v6.