title: webpack hangs at on "95% emit" / "95% emitting"
body: <p><a href="http://hastebin.com/oligitafov.cpp" rel="noreferrer">This is my production webpack config</a>. The two quotes in the title refer to webpack2 and webpack respectively. Both hang for me with a similar error.</p>
  
  <p>This is my command to trigger the build</p>
  
  <p><code>set NODE_ENV=production &amp;&amp; webpack --config config/webpack.config.prod.js --progress --display-error-details</code></p>
  
  <p>What am I missing?</p>
  
  <p>Here is the output after running <code>npm run pack</code> which correlates to my production webpack build:</p>
  
  <pre><code>$ npm run pack
  
  &gt; somedir@ pack C:\somedir
  &gt; set NODE_ENV=production &amp;&amp; webpack --config config/webpack.config.prod.js --progress --display-error-details
                             95% emitting
  </code></pre>