Error trying to create a new window

I get the following error:

```
TypeError: BrowserWindow is not a constructor
```

When trying to create a new empty browser window in Spectron.

``` js
this.app = new Application({
  path: electronPath,
  args: ['.'],
});
// ...
const { BrowserWindow } = app.electron.remote;
const webBrowser = new BrowserWindow({ width: 800, height: 800 });
```
