initSkeleton, initDepthStream and modifications

Added:
-initSensors()
Single method to enable all Kinect sensors.

-initSkeleton()
Initialization is complete, the stream conversion is not done.

-initDepthStream()
Stub code added and commented out for when we need it. (Not tested)

Modified:
-initColorStream: Method signature modified, it now accepts two
parameters for width and height.(Applies to XAML view)

Bugfixes:
-Skeletons array moved out of the handler to prevent crashes and major
memory leak, no idea why, only works this way lol

In progress:
-GestureDetection, Swipe (Naif and Abhi)
-XAML Design (Andrey)