web服务器：nginx 0.8.51 稳定版发布

Changes with nginx 0.8.51 27 Sep 2010
*) Change: the "secure_link_expires" directive has been canceled.
*) Change: a logging level of resolver errors has been lowered from "alert" to "error".
*) Feature: now a listen socket "ssl" parameter may be set several times.

下载地址：
windows:http://nginx.org/download/nginx-0.8.51.zip
linux:http://nginx.org/download/nginx-0.8.51.tar.gz