Changes with nginx 0.7.51 12 Apr 2009

    *) Feature: the "try_files" directive supports a response code in the
       fallback parameter.

    *) Feature: now any response code can be used in the "return" directive.

    *) Bugfix: the "error_page" directive made an external redirect without
       query string; the bug had appeared in 0.7.44.

    *) Bugfix: if servers listened on several defined explicitly addresses,
       then virtual servers might not work; the bug had appeared in 0.7.39.