Update reveal, fix scrolling and add transition option #600
…ault (previous know as linear but that name was deprecated).
People using nbconverted slides wanted from the very beginning to have scrolling slides. And we provide that even when reveal.js itself discouraged any use of scrolling inside the slides. As a consequence, in repetitive cases, the scrolling stuff broke. In this PR I am trying to make the scrolling stuff just a configurable thing and if the user really wanted, they can have it.
You have here more stuff on the scrolling discussion if you are interested: #78