Groundstation documentation

See merge request !85

Pycrocart

See merge request !84

Remaining issues:
1) If you unplug the crazyradio while running, the gui needs to return feedback to the user saying this is the case
2) If you try to send a setpoint while no crazyflie is connected, the gui offers no feedback that this is the case

# Conflicts:
#	pycrocart/PyCroCart.py

Resolve "Easily Set the Crazyflie Parameters"

See merge request !82