def add_trial(trial)
      RRRSpec.redis.rpush(RRRSpec.make_key(key, 'trial'),
                          trial.key)
    end
def add_trial(trial)
      RRRSpec.redis.rpush(RRRSpec.make_key(key, 'trial'),
                          trial.key)
    end
Public: Add a trial of the task.