title: webpack - remove "webpackBootstrap" code
body: <p>I am using WebPack to concat js files and output to a dist folder.  All this seems to work, however my problem is that I want to concat all the js files without extra webpack boostrap code </p>
  
  <pre><code>/******/ (function(modules) { // (/******/ (function(modules) { // webpackBootstrap)......
  </code></pre>
  
  <p>Is there anyway to prevent webpack from adding that code rather just take the plain js files and concat them (like gulp-concat). </p>