code: def stops(self, rt, direction):
          
          url = self.endpoint('STOPS', dict(rt=rt, dir=direction))
          return self.response(url)
docs: Return a list of stops for a particular route.
          
          Arguments:
              `rt`: route designator
              `dir`: route direction (INBOUND, OUTBOUND)
          
          Response:
              `stop`: (stop container) contains list of 
                  `stpid`: unique ID number for bus stop
                  `stpnm`: stop name (what shows up on the display in the bus,
                           e.g., "Forbes and Murray")
                  `lat`, `lng`: location of stop
                  
          http://realtime.portauthority.org/bustime/apidoc/v1/main.jsp?section=stops.jsp