Support for binary requests.

Hi

I've added support for binary requests.

Changes:
1. Added support for {binary_body, true} option in mochiweb_http:start/1.
If set, mochiweb_http:loop/3 sets the socket to {packet, http_bin} instead of {packet, http}.
2. Added support for retrieving the path, qs params and post parameters
when the socket is set to {packet, http_bind}.

I've tested it in my app and it is working good.
Could you please add this functionality?
Am I missing something else that is needed to support binary requests?

Thanks