Memory and port enhancements

[PaulEmich]

I made some changes to the port forwarding section. By default port forwarding is now disabled on a hypernode. Documentation is added on how to configure port forwarding and how to set up a custom memory value for the machine.

Forwarded ports are by default bound to 127.0.0.1:{PORT}

Quick example:

ports:
- send: 8082
  to: 80

paul@paul-MS-7A72:~/vagrant/hypernode/hypernode-vagrant$ netstat -na | grep 8082
tcp        0      0 127.0.0.1:8082          0.0.0.0:*               LISTEN

A custom bind-address can be set if (for instance) remote access is wanted:

ports:
- send: 8082
  to: 80
  bind-addr: 0.0.0.0

paul@paul-MS-7A72:~/vagrant/hypernode/hypernode-vagrant$ netstat -na | grep 8082
tcp        0      0 0.0.0.0:8082            0.0.0.0:*               LISTEN