New function (11/1/2014)
(Add) BodyStateDetector.cs==========
Add -- new methods to detect the hands' open state and body angle and rotation
==========

(Add) SkeletonToVectorHelper.cs==========
Add -- new methods provide a way to convert skeleton points to vector (2d and 3d), and maybe scale it with x, y, z factors
==========

(Global)==========
Modify -- Changed 'Status' to 'State'
Add -- added some comments
==========

IKinectService.cs==========
Modify -- changed name CurrentKinectSensor -> KinectSensor
Add -- Added new CoordinateMapper
==========

KinectService.cs==========
Modify -- Make KinectSensor implicity
Add -- Added new CoordinateMapper
==========

MainViewModel.cs==========
Add -- new _onAllFrameReady() to process the kinect frame data
Modify -- change name _mcuStatusChangedEventHandler -> _onMCUStateChanged
==========