title: Vertical legend in pieChart in one column in nvd3
body: <p>I need vertical legend in PieChart.
  Now library provide only 2 options: top/right.
  If use right - legend is in several columns. I need legend in one column.</p>
  
  <p>I found one hack - correct transform value and put legend in one column.</p>
  
  <pre><code>  var positionX = 30;
    var positionY = 30;
    var verticalOffset = 25;
  
    d3.selectAll('.nv-legend .nv-series')[0].forEach(function(d) {
      positionY += verticalOffset;
      d3.select(d).attr('transform', 'translate(' + positionX + ',' + positionY + ')');
    });
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/dSGrD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dSGrD.png" alt="Example"></a></p>
  
  <p>It works, but If I click to legend to update it - legend return to start position (several columns).
  <a href="https://i.stack.imgur.com/Cpj7n.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Cpj7n.png" alt="enter image description here"></a></p>
  
  <p><a href="https://jsfiddle.net/w673x499/" rel="nofollow noreferrer">JSFiddle example</a></p>