title: Morris.js Bar Charts unable to format x-labels
body: <p>I want to format x-labels in morris.js Bar chart.</p>
  
  <p>Please see this code:
  <a href="http://jsbin.com/uzosiq/258/embed?js,output" rel="nofollow noreferrer">http://jsbin.com/uzosiq/258/embed?js,output</a></p>
  
  <p><code>xLabelFormat</code> option is not available in Bar chart example which is available in all other type of charts as in <a href="https://morrisjs.github.io/morris.js/lines.html" rel="nofollow noreferrer">https://morrisjs.github.io/morris.js/lines.html</a> 
  but not in <a href="https://morrisjs.github.io/morris.js/bars.html" rel="nofollow noreferrer">https://morrisjs.github.io/morris.js/bars.html</a></p>