Server Client implementation with JSON RPC

[alexist2623]

Feature you want to implement

Implement basic server-client framework with python and TCP. Client can access to server instance with class JsonRPCClient without actual class instance. Actual class instance which works real communication with peripheral devices is created in Server and it is controlled with class JsonRPCServer. JsonRPCServer contains thread which runs TCP server for each port. When there is variation in instances, server will notify this variation to all of the clients.

How the feature is implemented

Features will be implemented with __getattr__, and __setattr__ method as M-labbs did. M-labs scipyco returns result for each rpc call, but in our program, there will be no immediate response to client from server. All variation will be notified from server to client asyncnously.