title: react-bootstrap - issue with ie11
body: <p>I'm not able to get react-bootstrap to work with IE11. Here is what I did:</p>
  
  <ol>
  <li><code>create-react-app test-app</code>, then cd to <code>test-app</code> folder</li>
  <li><code>npm install --save bootstrap</code></li>
  <li><code>npm install --save react-bootstrap</code></li>
  <li><code>npm start</code>  (application opens in IE11 ok at this point)</li>
  <li>Close browser and cancel the <code>npm start</code> operation</li>
  <li>Edit <code>App.js</code> and add the following line at the top:
  
  <ul>
  <li><code>import Button from 'react-bootstrap/Button';</code></li>
  </ul></li>
  <li>Run <code>npm start</code> again and open app in IE11. Browser screen is blank.</li>
  </ol>
  
  <p>I checked the javascript Console but did not see any errors.</p>
  
  <p>Any ideas on how to make this work?</p>