[Fix #2] Force troublesome colors into RGB colorspace.

BWSTRShape's -colorAtPoint: always returns a color in the RGB colorspace.  The background colors were set via system constants.  UIColor +blackColor and UIColor +whiteColor were created within a Grayscale colorspace.  Because the colorspaces were different, the touch colors and background colors were not considered equal.
Set right hand as default.
Choose based on shape shape rather than shape name.