title: $geoWithin query form mongodb to mongoose statement
body: <p>Have this query from mongodb:</p>
  
  <pre><code> db.location.find(
   {loc: { $geoWithin: { $centerSphere: [ [ 9, 9], 
   radius ] } }, action:1 })
   .limit(10)
   .skip(1, function(err,   result) {
      console.dir(result);
   });
  </code></pre>
  
  <p>How to translate it to mongoose statement with using geoWithin?</p>