docs: def _pull_schedule_loop(self):
          """ Called every 16 minutes to pull a new version of the schedule """
          try:
              self.pull_schedule()
              delay = 16*60
          except ScheduleError, e:
              self.l.exception("ScheduleError while pulling schedule.  "+
                               "Retrying in 5m")
              delay = 5*60
          if not self.running:
              return
          self.scheduler.plan(time.time() + delay, self._pull_schedule_loop)