Allow npm dependencies to drop stuff into Resources/
Sketch plugin libraries like [sketch-toolbar-item](https://github.com/abynim/sketch-toolbar-item) require you to add a `.framework` bundle to your plugin's `Resources` folder. `skpm` lets you automate that a little bit with fields in `package.json`, but I wonder if it'd be useful to allow npm packages in your dependencies list to add stuff to your `Resources`... then, all you'd need to do to bring in a library like `sketch-toolbar-item` is `npm install --save` it, and then `import` its JS API in your plugin's JS code. That'd be cool!