title: Webpack2 node-libs-browser exclude?
body: <p>I've upgraded to webpack 2 and before tree shaking my bundle size has increased. When investigating why it seems I have large files like <code>bn.js</code> and <code>eliptic</code> (some dependencies of node-libs-browser - which itself is now a dependency of webpack2). Is there any way to remove these or exclude them? In webpack1 they weren't being added to my bundle. </p>