Changes with nginx 0.7.44 23 Mar 2009

    *) Feature: the ngx_http_proxy_module preliminary cache support.

    *) Feature: the --with-pcre option in the configure.

    *) Feature: the "try_files" directive is now allowed on the server
       block level.

    *) Bugfix: the "try_files" directive handled incorrectly a query string
       in a fallback parameter.

    *) Bugfix: the "try_files" directive might test incorrectly directories.

    *) Bugfix: if there is the single server for given address:port pair,
       then captures in regular expressions in a "server_name" directive
       did not work.