title: d3 change position of pie chart (middle point)
body: <p>Is there a way to change the position of a pie chart in D3 ?
  It seems I can only set the inner and outer Radius not the center.
  I want to draw another cicle around my donut chart (gauge) but it doesn't fit now.
  In IE it looks ok though, so it might also be an browser bug.
  Any help is appreciated, I am quit new to html/d3/javascript.</p>
  
  <p>I made a fiddle of my code :
  <a href="https://jsfiddle.net/mistert69/nz0tvq24/3/" rel="nofollow">https://jsfiddle.net/mistert69/nz0tvq24/3/</a> </p>
  
  <p>no center of radius ? :</p>
  
  <pre><code>var arc = d3.svg.arc()
      .innerRadius(innerRadius)
      .outerRadius(outerRadius);
  
  var pie = d3.layout.pie()
      .startAngle(-120 * (pi / 180))
      .endAngle(120 * (pi / 180));
  </code></pre>