fabric can start and stop 2 web-app served by gunicorn on a fixed remote server

Each web-app must be already deployed on the remote server.

Arialdo can start his app with `fab start:ari` and `fab start:ari`.

Mattia can start his app with `fab start:mattia` and `fab start:mattia`.

The 2 web-apps will use different http ports, so they could be deployed independentely.