Comments

The following  programs  contains the comments
Merge remote-tracking branch 'origin/master'

Conflicts:
	Model/Clock.cpp
	Model/Clock.h
	Model/ExternalButton.cpp
	Model/ExternalButton.h
	Model/InternalButton.cpp
	Model/InternalButton.h
	Model/Lift.cpp
	Model/Lift.h
	Model/Model.cpp
	Model/Model.h
	Model/Passenger.cpp
	Model/Passenger.h