title: NVD3 Line chart tics wrongly aligned to grid when using datetype on xAxis
body: <p>I am currently working with NVD3 using Angular Directive (angular-nvd3). I have a very simple line chart with very simple data.</p>
  
  <p><strong>The problem I have encountered now is that my data is wrongly aligned with the Axis.</strong> Example plunker available here: <a href="http://plnkr.co/edit/jWEYt6?p=preview" rel="nofollow">http://plnkr.co/edit/jWEYt6?p=preview</a> ,</p>
  
  <p>I am using dates on my xAxis, which are parsed using d3 library:</p>
  
  <pre><code>tickFormat: function(d) {return d3.time.format('%d/%m')(new Date(d))}
  </code></pre>
  
  <p><strong>Description:</strong></p>
  
  <p><em>I would expect the xAxis labels to be correspondent to the grid.</em></p>
  
  <p><em>In the example you can clearly notice that the xAxis is not evenly devided (values: 06/11, 08/11, 11/11, 13/11)</em>. So usually 2 days and sometimes 3 days :)</p>
  
  <p><em>What is worse - the peaks are not matching the grid. Example: 06/11 tick is really not even close to the grid's line where I guess it is supposed to be.</em></p>
  
  <p>I have also tried this on <code>master's</code> code from repo and it happens there too. There is a link in the HTML head section.</p>
  
  <p>Is there a problem with my data, proper date formatting or something else? Thanks!</p>