Changes with nginx 0.5.0 04 Dec 2006

    *) Change: the parameters in the "%name" form in the "log_format"
       directive are not supported anymore.

    *) Change: the "proxy_upstream_max_fails",
       "proxy_upstream_fail_timeout", "fastcgi_upstream_max_fails",
       "fastcgi_upstream_fail_timeout", "memcached_upstream_max_fails", and
       "memcached_upstream_fail_timeout" directives are not supported
       anymore.

    *) Feature: the "server" directive in the "upstream" context supports
       the "max_fails", "fail_timeout", and "down" parameters.

    *) Feature: the "ip_hash" directive inside the "upstream" block.

    *) Feature: the WAIT status in the "Auth-Status" header line of the
       IMAP/POP3 proxy authentication server response.

    *) Bugfix: nginx could not be built on 64-bit platforms; bug appeared
       in 0.4.14.