Crazyflie Quadcopter firmware and clients

client-dev has our Google maps integration and compass GUI in addition to our quadcopter AI. Also added functionality so quadcopter always points towards north for improved handling and control.

client-dev-leap adds Leap Motion support for controlling the quadcopter with your hands.

bitcraze-crazyflie-firmware is the firmware to be loaded on the copter with enhanced outputs including current heading.

ak1394 firmware and client are used for compass calibration.