changes for ios
minor cleanup of train.html
attempt to get level 9 working on webgl. not yet able to get screenshot
working.
upgraded libgdx to latest nightly
attempt to get level 9 working in gwt - failed - bug in setcolor and
some other bug in drawing pixmap inside another (or in texture regions)
cleanup of viewspec for image, drawing. Slight problem with name in
groups - for now using viewspec itself.
Major refactoring to cleanup factory methods for actors, tutors 
- moving them to controller
viral electromagnetism hook - basics are working. now to put it together
into a wizard or sequence.
fieldmeter simplified and removed from electromagnetism view