title: webpack extract-text-plugin output multiple css files
body: <p>I'm trying to get my webpack build to export 2 css files, one for all the lib files, and one for my files. I am requiring both files separately into my main.js. Atm it is merging all css requires into 1 file.</p>
  
  <p>Only way I have been able to generate files is by splitting the entry:</p>
  
  <pre><code>entry: {
      lib:'./style/lib.scss',
      app: [
        './src/index.js',
        './style/style.scss',
      ],
    },
  </code></pre>
  
  <p>But the lib.scss generated is a duplicate of style, and this method also creates a redudant lib.js. Is there any way to create 2 separate css files, or to set any css that is required needs to be exported individually and not merged into single file?</p>