version 0.6

Bugs fixed:
- The IP address is now stored in the local file only if the update
action has been performed successfully. Before it was always written.
- Constructor method "__init__" added. Creates the file myIP.txt if it
does not exist.
- Method checkIP has been replaced for newIP, which returns True if the
IP has changed (compared to the stored value), and False otherwise.
- New method storeIP defined.