update vc2012 project

Signed-off-by: Jack <jack.wgm@gmail.com>
improve async socks4 proxy

Signed-off-by: Jack <jack.wgm@gmail.com>
implementation async socks proxy

Signed-off-by: Jack <jack.wgm@gmail.com>
update http_stream.hpp

Signed-off-by: Jack <jack.wgm@gmail.com>