Checkpoint a lot of typing in the state machine rewrite.
Domains in action, maybe, catching errors with the USB radio dongle
going away mid-use. I'll need to reproduce this error, perhaps with
a test.
Fiddling.
An example of LeapMotion control of the Crazyflie:
a circle gesture gets it to take off, then swipes up & down
control the thrust.
Circle gestures! The copter now takes off on a finger twirl.
Bump version, move leap to optional deps.
Merge pull request #10 from ceejbot/leap-motion

Leap motion + a state machine start