Define and implement IQuatTracker, an interface for a tracker that exports rotation data as authoritive quaternions. Intended to be used with VR trackers like Oculus Rift where adjusting rotation serves no purpose, because you almost always want 1:1. (Exaggerated rotation can cause feelings of sickness!)
Use quaternions for rotation when the tracker supports them.
Merge branch 'FeepingCreature-master'
Merge branch 'master' of https://github.com/pizzaoverhead/KerbTrack

Conflicts:
	KerbTrack/KerbTrack.cs