Changes with nginx 0.8.16 22 Sep 2009

    *) Feature: the "image_filter_transparency" directive.

    *) Bugfix: "addition_types" directive was incorrectly named
       "addtion_types".

    *) Bugfix: resolver cache poisoning.
       Thanks to Matthew Dempsky.

    *) Bugfix: memory leak in resolver.
       Thanks to Matthew Dempsky.

    *) Bugfix: invalid request line in $request variable was written in
       access_log only if error_log was set to "info" or "debug" level.

    *) Bugfix: in PNG alpha-channel support in the
       ngx_http_image_filter_module.

    *) Bugfix: nginx always added "Vary: Accept-Encoding" response header
       line, if both "gzip_static" and "gzip_vary" were on.

    *) Bugfix: in UTF-8 encoding support by "try_files" directive in
       nginx/Windows.

    *) Bugfix: in "post_action" directive usage; the bug had appeared in
       0.8.11.
       Thanks to Igor Artemiev.