nginx-0.2.4-RELEASE import

    *) Feature: the ngx_http_ssi_module supports "$var=text", "$var!=text",
       "$var=/text/", and "$var!=/text/" expressions in the "if" command.

    *) Bugfix: in proxying location without trailing slash; the bug had
       appeared in 0.1.44.

    *) Bugfix: the segmentation fault may occurred if the "rtsig" method
       was used; the bug had appeared in 0.2.0.