New KinectVector4.ToString()
KinectJoint now lets Position format itself
Fixed misplaced comment
New indexer for the body by KinectJointType
Renamed KinectJoint.Rotation -> Orientation for consistency
Clarified orientation to avoid misconceptions
New collection of child-parent joint relationships on KinectJoint
Removed "Skeleton" from joint method name for consistency

All Kinect2 methods refer to bodies now, not skeletons.
Removed body frame reader list, renamed methods on KinectBodyFrameHandler

Kinect2 SDK only supports one sensor right now, and it does not look like
that's going to change in the near future. Cleaning up code.
Renamed KinectJointTrackingState -> KinectTrackingState

The tracking state is actually being used for properties other than just
joints.
Transmitting a body's Lean and LeanTrackingState
Fixing small KinectDataPublisher break from d03006f
Renamed KinectBodyData -> KinectBody for consistency
Merge branch 'release/0.2'