hxnodejs does not fully implement sys.net.Socket (needed for sys.Http)

This could be noise (because haxe.Http exists), or it could be related to #59 ; I noticed that the sys.net.Socket implementation in hxnodejs does not implement the all of the variables and methods defined in https://api.haxe.org/sys/net/Socket.html which means trying to use sys.Http will result in compiler errors. Specifically, it looks like it is missing the `output` stream variable and the `setTimeout` and `shutdown` methods.