Improve setPeer and listPeers
setPeer can now take a pony id, aswell as ip:port combination.
Before it could only take a "ip port" combination, which is incompatible with listPeers.
listPeers now also shows pony id and pony name.
Merge pull request #17 from daniel-j/patch-setPeer-listPeers

Improve setPeer and listPeers