Node class, WIP
Node class, WIP

- for new network subsystem

bmng-dev/PyBitmessage,bmng-dev/PyBitmessage,hb9kns/PyBitmessage,hb9kns/PyBitmessage,hb9kns/PyBitmessage,hb9kns/PyBitmessage,bmng-dev/PyBitmessage