title: Barplot with errors in bokeh
body: <p>I am trying to draw a figure like that <a href="http://seaborn.pydata.org/_images/seaborn-barplot-1.png" rel="nofollow noreferrer">http://seaborn.pydata.org/_images/seaborn-barplot-1.png</a></p>
  
  <p>As I understand bokeh don't have special method for barplot with error, so I decided to use Seaborn and then convert it into bokeh chart by to_bokeh() function.</p>
  
  <pre><code>sns.set_style("whitegrid")
  plot = sns.barplot(data=[[1,2], [3,4]])
  plot.get_figure().savefig('1.jpg')
  
  l = layout([[widgetbox(*controls), to_bokeh(plot.get_figure())]])
  save(l)
  </code></pre>
  
  <p>It save normal plot, like at the picture, but bokeh shows only error line, and no bars.
  What do I wrong, is it bug? Is there simpler way to draw chars like that in bokeh. I also should use strings as a ticks.Does bokeh support it?</p>