title: Add data to an embed bokeh plot
body: <p>Here’s the thing, I’m actually having a Python backend and a Reactjs front end.</p>
  <p>Actually I’ve got a bokeh plot embedded with :</p>
  <ol>
  <li>Bokeh.embed.json_item() in the server side</li>
  <li>Bokeh.embed.embed_item() in the client side.</li>
  </ol>
  <p>Is it possible from that to only send new data to that embedded bokeh plot ? Or am I doing it wrong ?</p>
  <p>Cheers !</p>