def finish_task(task)
      RRRSpec.redis.lrem(RRRSpec.make_key(key, 'tasks_left'), 0, task.key)
    end
def finish_task(task)
      RRRSpec.redis.lrem(RRRSpec.make_key(key, 'tasks_left'), 0, task.key)
    end
Public: Finish the task. It is no longer appeared in the `tasks_left`.