revisited data structure to passing to daemon:

-uniformed protocol-> { "<cmd>": (<param0>, <param1>, ...) }
- implemented program shutdown by KeyboardInterrupt
  it will be temporary, it will not needed when the system
  will launch it like a service

- added connection_manager to dispatch command to the server
Implemented a ConnectionManager for processing commands and
make requests to send to server
Merge branch 'master' of https://github.com/corso-python-prato/share-system-team2

Conflicts:
	client/client_cmdmanager.py
Merge branch 'master' of https://github.com/corso-python-prato/share-system-team2