title: geojson circles, supported or not?
body: <p>When I look up the specs of GeoJson I see that circles are supported: </p>
  
  <p><a href="http://geopriv.dreamhosters.com/geojson/geojson-spec.html#circleExample" rel="noreferrer">http://geopriv.dreamhosters.com/geojson/geojson-spec.html#circleExample</a></p>
  
  <p>When I try out the code in geojsonlint (<a href="http://geojsonlint.com/" rel="noreferrer">http://geojsonlint.com/</a>) however, it gives me an error. </p>
  
  <p>Input:</p>
  
  <pre><code>{ 
  "type": "Circle",
  "coordinates": [4.884, 52.353],
  "radius": 200
  }
  </code></pre>
  
  <p>Gives: </p>
  
  <pre><code>"Circle" is not a valid GeoJSON type. 
  </code></pre>
  
  <p>I want to show different places of interests with a range of influence on a map by using d3. It needs GeoJson for input but it is true that circles are not supported with GeoJson? </p>