code: function(key, southwest, northeast) {
        if (!(southwest instanceof Parse.GeoPoint)) {
          southwest = new Parse.GeoPoint(southwest);
        }
        if (!(northeast instanceof Parse.GeoPoint)) {
          northeast = new Parse.GeoPoint(northeast);
        }
        this._addCondition(key, '$within', { '$box': [southwest, northeast] });
        return this;
      }
docs: Add a constraint to the query that requires a particular key's
  coordinates be contained within a given rectangular geographic bounding
  box.
  @param {String} key The key to be constrained.
  @param {Parse.GeoPoint} southwest
  The lower-left inclusive corner of the box.
  @param {Parse.GeoPoint} northeast
  The upper-right inclusive corner of the box.
  @return {Parse.Query} Returns the query, so you can chain this call.