title: Fix categories in categoriaxis in dimple js
body: <p>I am using Dimple js to make a bar chart with one bar for each day (Sunday, Monday...). The problem is that sometimes there won't be data for a few days but I would still want my chart to show all the days with a value 0.</p>
  
  <p>How do I fix all the categories which should be shown on the axis?</p>
  
  <p>Edit:
  Here's a demo: jsfiddle.net/neme8got/
  I want the chart to show the days not shown now with a volume 0.</p>