Adding set_video_channel.
Merge branch 'master' into school-demo
Adding fake ARDrone simulator. Early days...
libfakeardrone.py now sort-of works.
Real ground image added.
Bugfixes.
Removing ∂heading to better match real drone.
More realistic rotation.
Starting in middle.
Adding exercise.py to be expanded in exercises.
Ignoring .DS_Store.
Adding .idea directory.
Some Python3 tweaks.
Minor tweaks to libfakeardrone.py.