Changes with nginx 0.5.4 15 Dec 2006

    *) Feature: the "perl" directive may be used inside the "limit_except"
       block.

    *) Bugfix: the ngx_http_dav_module required the "Date" request header
       line for the DELETE method.

    *) Bugfix: if one only parameter was used in the "dav_access"
       directive, then nginx might report about configuration error.

    *) Bugfix: a segmentation fault might occur if the $host variable was
       used; bug appeared in 0.4.14.