title: React' findNodeHandle method stopped working
body: <p>After upgrade to <em>0.26.0-rc</em> version, this line:</p>
  
  <pre><code>React.findNodeHandle(this.refs.myRef)
  </code></pre>
  
  <p>Throws this error message:</p>
  
  <blockquote>
    <p>Unhandled JS Exception: _react2.default.findNodeHandle is not a
    function.</p>
  </blockquote>
  
  <p>I'm importing React with this:</p>
  
  <pre><code>import React from 'react';
  </code></pre>
  
  <p>Docs <a href="https://facebook.github.io/react-native/docs/nativemethodsmixin.html#measurelayout" rel="noreferrer">still say</a>:
  <em>"As always, to obtain a native node handle for a component, you can use React.findNodeHandle(component)."</em></p>