title: How to modify chartjs tooltip to add customized attribute
body: <p>How I have to edit the tooltip template that i can add customized attributes from my json file ? Below the example:</p>
  
  <p><a href="http://i.stack.imgur.com/EBjrx.jpg" rel="nofollow">ChartJS Example</a></p>
  
  <p>In the x-axis are the Months with the first letter, but in the tooltip i want to show the first three letters of the month - How can i do this ?</p>
  
  <p><strong>EDIT:</strong> My JSON File:</p>
  
  <pre><code>{"modules":[{
  "name":"Chart 1",
  "link":"www.google.com",
  "type":"Bar",
  "series":"SeriesA",
  "data":[[20,40,50,40,20,20,20,20,20,20,20,20]],
  "labels":["M","J","J","A","S","O","N","D","J","F","M","A","M"],
  "colors":[{
      "fillColor":"blue"
      }],
  "options":{
      "scaleShowGridLines":false
      }
  
      }]}
  </code></pre>