Refactor server creation API
Refactor server creation API

Align it with net.createServer, big thanks to @mmalecki for the help and
not laughing at my inability to JavaScript.

fdgonthier/node-abstractsocket,fdgonthier/node-abstractsocket,saghul/node-abstractsocket,saghul/node-abstractsocket,saghul/node-abstractsocket,fdgonthier/node-abstractsocket