Simple remote server and client.
Commands now execute on server.
Implemented sending of numpy objects and enabled logging on server
Proxies are created in new modules proxies (to enable pickling). Refactored server and updated message syntax.
Moved execution code to the Command classes. Refactored data_received handler.
Moved commands to a separate file.
Rename main to __main__.

This enables running the server with
    python -m Orange.server
Server communicates using HTTP.
Add tests.