Changes with nginx 0.9.0 29 Nov 2010

*) Feature: the "keepalive_disable" directive.

*) Feature: the "map" directive supports variables as value of a
defined variable.

*) Feature: the "map" directive supports empty strings as value of the
first parameter.

*) Feature: the "map" directive supports expressions as the first
parameter.

*) Feature: nginx(8) manual page.
Thanks to Sergey Osokin.

*) Feature: Linux accept4() support.
Thanks to Simon Liu.

*) Workaround: elimination of Linux linker warning about "sys_errlist"
and "sys_nerr"; the warning had appeared in 0.8.35.

*) Bugfix: a segmentation fault might occur in a worker process, if the
"auth_basic" directive was used.
Thanks to Michail Laletin.

*) Bugfix: compatibility with ngx_http_eval_module; the bug had
appeared in 0.8.42.