Added support for ardrone control (drone_control.py) through
keyboard (drone_keyboard.py) and joystick (drone_joystick) input.
flownav.launch: Adjusted parameters for outdoor flight
subscribers.py: is now framebuffer.py
joystick.launch: runs an independent node for handling joystick input
and sending it to ardrone. also allows for button configuration.
flownav.py: updated to allow for ardrone integration