Add BasePyroMain, and use it in pyroproxy.cli.*
FIX rename mistakes of previous commit
Handle KeyboardInterrupt
Ping forever (like normal ping), until Ctrl+C
Use logger instead of print
Add --check-pyro-server to BasePyroMain
Add sleep() if error was detected
Check if PyRO server is reachable by default
FIX doc
Rename 'cli'