docs: def by_geopoint(self, lat, long, radius, term=None, num_biz_requested=None, category=None):
          """
          Perform a Yelp Review Search based on a geopoint and radius tuple.
  
          Args:
            lat      - geopoint latitude 
            long     - geopoint longitude  
            radius   - search radius (in miles)
            term     - Search term to filter by (Optional)
            num_biz_requested - Maximum number of matching results to return (Optional)
            category - '+'-seperated list of categories to filter by. See
          http://www.yelp.com/developers/documentation/category_list
          			  for list of valid categories. (Optional)
  
          """
          
          header, content = self._http_request(
              self.BASE_URL,
              lat    = lat, 
              long   = long, 
              radius = radius, 
              term   = None, 
              num_biz_requested = None
          )		
          return json.loads(content)