4.0 published.
高亮功能行；清空的小反应……不过貌似还是有点问题在。
4.0.1, 更新提交限制，自动提交只能一次
Merge pull request #4 from iccfish/master

pull request form iccfish 4.0.1，更新自iccfish，私人用途，请勿传播
revert sys message
4.0.2 Released.
Merge pull request #5 from iccfish/master

pull request form iccfish 4.0.2
4.0.3, 调整席别优选时车次优选的逻辑
4.0.5 released. 一车改动。
4.0.6
添加部分提交功能，当余票数不足时，自动按顺序部分提交订单
Merge pull request #6 from iccfish/master

pull request form iccfish 4.0.6
4.0.7
4.0.8 released.
Merge pull request #7 from iccfish/master

4.0.8 released.