Modifying openTun.py for accounting also MAC OS systems and adding configuration file openTunMACOS.py for letting OpenWSN work on MAC OS
Adding openTunMACOS.py
SW-148. Fixing some small issues
SW-148. Dynamically choosing the first available tun interface and porting routing and forwarding commands to MAC OS
SW-148. Fixed indentation error.
SW-148. Fixed another indentation error.
SW-148. Again indentation error...
SW-148. Debugging
SW-148. Fixing small things
SW-148. Adding a break
SW-148. Enabling forwarding
Merge pull request #72 from NicolaAccettura/develop

SW-148. Fix.