Merge pull request !318 from 稚屿/N/A
Merge pull request !316 from 马小法/master
Merge pull request !312 from 稚屿/master
Merge pull request !309 from 稚屿/master
Merge pull request !308 from xiaoshitou/N/A
Merge pull request !304 from 马小法/master
Merge pull request !303 from Gold_Fish/master
Merge pull request !299 from Ming/master
Merge pull request !298 from wjtc8/N/A
增加available方法于XssHttpServletRequestWrapper
