sample: tweaks to use bundler
core: transformer handles document
core: added methods to skeleton to add js and css files
infodeck: hide elements that have faded out

this approach uses jquery fadeIn/fadeOut on html elements and a class
application on svg elements. I can't use jquery fades on svg elements
but the fade does handle hiding the element after the fade is complete
infodeck: use class change for all hides and shows

switching between jquery and class changes would mean going back
through old decks to put enough info into the selectors to be able to
spot the difference - and I think the result would be too brittle to
use anyway. So instead using a single mechanism for all changes.
infodeck: refactored to mention jquery version in one place
infodeck: fix lack of fade in firefox/ie