WIP on Overlord/Receptor/Server model.
More WIP. Commands seem to work again.
Telnet: Handle conn-reset-by-peer disconnections, and notify overlord to self-unregister when dying.
Ensure TelnetConnections terminate their celluloid actor when they disconnect.
Refactor some TelnetConnection stuff into a Connection superclass
typo
Add some test/proof-of-concept code to show Server can be rebooted and connections resume. Next step is to implement Server launching as its own process and implement IPC, so that the Server does code reload.