[KLMB/SAMPLE/TEST]: removed debug GL context.
[KLMB/MATERIAL/WRAPPER]: added std ownership management methods (give_up and assume).
[KLMB/MATERIAL/WRAPPER]: added std ownership management methods (give_up and assume).
[YAGGLER/SHADER/SHADER]: removed the debug std::cout in constructor.
[KLMB|YAGGLER/SAMPLES]: disabled all the samples except 'test-klmb'.
[YAGGLER/CMAKE]: removed the mandatory build directory (strongly recommended, but not necessary)