setup.py: Set version to 2013.4.1
setup.py: Set version to 2013.4.1

peteflorence/crazyflie-tools,peteflorence/crazyflie-tools,peteflorence/crazyflie-tools,blandry/crazyflie-tools,blandry/crazyflie-tools,peteflorence/crazyflie-tools,blandry/crazyflie-tools,blandry/crazyflie-tools