更新数据库中间件描述信息，详情请看：https://github.com/doocs/advanced-java/blob/master/docs/high-concurrency/database-shard.md

* fix typo in distributed-lock-redis-vs-zookeeper.md
* update redis-single-thread-model.md

更新 Redis 分布式锁相关描述
详细说明查看：https://github.com/doocs/advanced-java/blob/master/docs/distributed-system/distributed-lock-redis-vs-zookeeper.md

更新 Dubbo 集群容错策略相关描述
详细说明查看：https://github.com/doocs/advanced-java/blob/master/docs/distributed-system/dubbo-load-balancing.md

* fix typo and close #68
* thanks @dusked

fix #67, see https://github.com/doocs/advanced-java/blob/master/docs/high-concurrency/how-to-ensure-high-availability-of-message-queues.md

Add gitee for Chinese developers. See https://gitee.com/doocs/advanced-java

更新 Hystrix 多个文件描述信息

[ImgBot] Optimize images

*Total -- 968.66kb -> 104.40kb (89.22%)

/images/advanced-java-doocs-shishan.png -- 484.33kb -> 52.20kb (89.22%)
/docs/from-readers/images/advanced-java-doocs-shishan.png -- 484.33kb -> 52.20kb (89.22%)

* 新增维权行动
* 欢迎曝光抄袭者

In the morning, I took some time and synchronized the project `advanced-java` to Gitee.
You can visit https://doocs.gitee.io/advanced-java to get a better experience if you are in China.
The original Gitee url is https://gitee.com/Doocs/advanced-java

See https://github.com/doocs/advanced-java/blob/master/docs/from-readers/doocs-advanced-java-attention.md

In the morning, I took some time and synchronized the project `advanced-java` to Gitee.
You can visit https://doocs.gitee.io/advanced-java to get a better experience if you are in China.
The original Gitee url is https://gitee.com/Doocs/advanced-java

See https://github.com/doocs/advanced-java/blob/master/docs/from-readers/doocs-advanced-java-attention.md