setup.py: Set version 2013.4.2
setup.py: Set version 2013.4.2

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