title: Invariant Violation when importing as alias
body: <p>When importing a component as an alias I receive this error:</p>
  
  <blockquote>
    <p>Invariant Violation: Element type is invalid: expected a string (for
    built-in components) or a class/function (for composite components)
    but got: undefined. Check the render method of <code>Divider</code>.</p>
  </blockquote>
  
  <pre><code>import { Divider as MuiDivider} from 'material-ui/Divider'
  
  const Divider = () =&gt; &lt;MuiDivider style={{margin: '1em 2em'}} /&gt;
  
  &lt;Divider /&gt;
  </code></pre>
  
  <p>This works:</p>
  
  <pre><code>import Divider from 'material-ui/Divider'
  
  &lt;Divider /&gt;
  </code></pre>