title: Axes-Reordering event on parallel coordinates
body: <p>i m still working on a parallel coordinates plot using <a href="https://github.com/syntagmatic/parallel-coordinates#parallel-coordinates" rel="nofollow">https://github.com/syntagmatic/parallel-coordinates#parallel-coordinates</a> and d3.js</p>
  
  <p>i need to update something after the axes are reordered.<br>
  So try to add an listener to the parcoords, but i don't find how the event is called which is fired when the axes are reordered.</p>
  
  <p>I use the .reorderable() method to enable the reordering.
  I tried </p>
  
  <pre><code> parcoords.on("dimensions",function (){
                  alert('reorder');
              });
  </code></pre>
  
  <p>but "dimensions" is not the right event, it is only triggered after changing the axes using the .dimensions() method.
  I went through the examples of the library, but only found on brush events, and went through the api description, but didn't found the right event.</p>
  
  <p>the question is: what is the reorder event called?  </p>
  
  <p>thanks in advance<br>
  greetings Jones</p>