Change floor(n) -> int(floor(n)) to give integer result in Python 2.x as well as in Python 3.x
Change floor(n) -> int(floor(n)) to give integer result in Python 2.x as well as in Python 3.x

BruceSherwood/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter,mwcraig/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter