SkeletonFitting added method to fit legs using for the middle position of the leg the
highest point in each leg
SkeletonFitting, added methods to get front and side projections.
Added some comments
SkeletonFitting added method find_vertebral_end_pos with it the back bone is
placed.

With this method all the bones are attempted to be place in its correct position but
the failure rate and the precision have to be improved
SkeletonController added all the fit methods to the update loop
IMPORTANT This code modifies again the RGBDCamera to use less frames for faster
development.