Changed protobuf message ClientInfo from string to type byte.
Refactored server side for sending received messages from client to the application instead of parsing them.
Wrapped line under 79 chars in zmq_base.
Completed app-server-client communication wrt sync.
Added server_state module from u1db trunk.
Removed queue. Queuing messages directly on the socket itself.
Added sync module from u1db trunk.
Added SyncResource class and response methods for handlers to get_sync_info_request and put_sync_info_request.