title: dump missing date in data for chartjs
body: <p>Supposing that I will use line chart from ChartJS, and I have 'value by date' data.
  example: </p>
  
  <pre><code>5   : 05-11-2014
  10  : 04-11-2014
  55  : 01-11-2014
  </code></pre>
  
  <p>the chart will be contain 3 points.</p>
  
  <p>is there any solution, configuration that let me add automatically add (dump) missing date with 
  value = 0, so the data for the example will be :</p>
  
  <pre><code>5   : 05-11-2014 
  10  : 04-11-2014 
  0   : 03-11-2014 
  0   : 02-11-2014
  55  : 01-11-2014
  </code></pre>
  
  <p>and of course the chart will contain 5 points.</p>
  
  <p>I just need some logic to handle this kind of problem exactly when dealing with few points by whole year for example.</p>