从 netty 3 修改为 netty4
Merge pull request #1 from dangdangdotcom/master

update docs
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Merge pull request #2 from dangdangdotcom/master

修复kryo, zk timeout issue.
修改文档目录
modify tomcat pom dependency