Make script executable

src/freedombone

   echo "ifconfig wlan0:avahi 192.168.$a.$b netmask 255.255.255.0 broadcast 192.168.13.255" >> /usr/bin/mesh-babel
   echo "babeld -D wlan0:avahi -p $BABEL_PORT -d 5 wlan0" >> /usr/bin/mesh-babel
   echo 'exit 0' >> /usr/bin/mesh-babel
+  chmod +x /usr/bin/mesh-babel
 
   echo 'mesh_babel' >> $COMPLETION_FILE
 }