Changes with nginx 1.2.5 13 Nov 2012
*) Feature: the "optional_no_ca" parameter of the "ssl_verify_client" directive. Thanks to Mike Kazantsev and Eric O'Connor.
*) Feature: the $bytes_sent, $connection, and $connection_requests variables can now be used not only in the "log_format" directive. Thanks to Benjamin Grössing.
*) Feature: resolver now randomly rotates addresses returned from cache. Thanks to Anton Jouline.
*) Feature: the "auto" parameter of the "worker_processes" directive.
*) Bugfix: "cache file ... has md5 collision" alert.
*) Bugfix: OpenSSL 0.9.7 compatibility.