Rotate camera with Left Hand, when there are two hands

- The rotation is a bit iffy
Ease boat into rotation when speed reaches threshold

- Refactors Magnitude into a float variable, for reuse

Referencs:
- http://docs.unity3d.com/ScriptReference/Vector3.RotateTowards.html
Find and use a local forward instead of the World forward

References:
- http://answers.unity3d.com/questions/316918/local-forward.html
Merge branch 'feature/rotateCameraWithHands'

* feature/rotateCameraWithHands:
  Find and use a local forward instead of the World forward
  Ease boat into rotation when speed reaches threshold
  Rotate camera with Left Hand, when there are two hands

Conflicts:
	Assets/Scripts/Leap/LeapHandWave.cs
Fix mispelled word and variable 'magnitude'