tilt: initial leapmotion support
tilt: leapmotion: allow only one hand
tilt: leapmotion: thumb camera control
tilt: leapmotion: grab to pause
tilt: leapmotion: add pitch slope for better hand control
tilt: leapmotion: left hand support for camera control
tilt: leapmotion: don't link against libstdc++
tilt: leapmotion: update docs
Merge pull request #92 from libcg/leap-motion

Leap motion support