Box2d post Albany

Now has better use of table. Box2d no longer overwrites written response
in table.
Graph and CarGraph updates for better animation

Cargraph now allows a "track", the "correct answer" underlays the
student image. Both grapher and Cargraph now allow changing graph size
(width, height fields in graphParams).
Cargraph bug fix

Was only showing as many segments in expected as given in predicted
Merge branch 'master' of https://github.com/WISE-Community/WISE