Sources of the redis module for the NGINX ports.

This port installs the sources only.  It does not build a loadable module
by itself; www/nginx, www/nginx-devel and www/freenginx pick the sources up
and build ngx_http_redis_module.so when their HTTP_REDIS option is enabled.

The module is an HTTP content handler that reads one key from a Redis server
with a single GET and serves the value as the response body, the way the
memcached module bundled with nginx serves a memcached value.  The key comes
from the $redis_key variable, a nil reply is a 404, and the value is streamed
back untouched.
