Update xml/cn/docs/hash.xml
Update xml/cn/docs/http/ngx_http_core_module.xml

update contents about hash
Update xml/cn/docs/http/ngx_http_referer_module.xml
Update xml/cn/docs/http/ngx_http_core_module.xml
Update xml/cn/docs/events.xml
Update xml/cn/docs/events.xml
Update xml/cn/docs/hash.xml
Merge pull request #33 from cfsego/master

哈希设置相关