title: Can I plot a colorbar for a bokeh heatmap?
body: <p><strong>Does bokeh have a simple way to plot the colorbar for a heatmap?</strong></p>
  
  <p><a href="http://bokeh.pydata.org/en/latest/docs/user_guide/charts.html#heatmap" rel="noreferrer">In this example</a> it would be a strip illustrating how colors correspond to values.</p>
  
  <p>In matlab, its called a 'colorbar' and looks like this:
  <a href="https://i.stack.imgur.com/HwtcP.png" rel="noreferrer"><img src="https://i.stack.imgur.com/HwtcP.png" alt="enter image description here"></a></p>