rename blackboard jasmine spec
CurrentSlide is first slide if slideindex > number of slides (case when teacher as more slides then attendee)
extracting a current method in SlideShow
removing showCurrentSlide and ShowClassicSlide methods
removing _currentSlide
renaming spec
removing _updateCurrentSlide and _showCurrentSlide
Adding blackboard test : update on every refresh
moving blackboardSlieshow test to slideshow test
moving blackboardSlieshow test to slideshow test (key handling correcion)