* [NOD-1124] Begin implementing netadapter.
* [NOD-1124] Implementing a stub gRPC server..
* [NOD-1124] Construct the server inside the netadapter.
* [NOD-1124] Rewrite protocol.go to fit with the new netAdapter model.
* [NOD-1124] Wrap a connection in Peer.
* [NOD-1124] Add a peerstate object.
* [NOD-1124] Remove the peerstate object.
* [NOD-1124] Remove router out of Peer.
* [NOD-1124] Tag a TODO.
* [NOD-1124] Return an error out of AddRoute if a route already exists for some message type.
* [NOD-1124] Rename the package grpc to grpcserver.
* [NOD-1124] Extracted newConnectionHandler into a type.
* [NOD-1124] Extract routerInitializer into a type.
* [NOD-1124] Panic/Add TODOs everywhere that isn't implemented.
* [NOD-1124] Improve the NetAdapter comment.
* [NOD-1124] Rename NewConnectionHandler to PeerConnectedHandler.
* [NOD-1124] Rename buildRouterInitializer to newRouterInitializer.
* [NOD-1124] Remove unreachable code.
* [NOD-1124] Make go vet happy.