Move interactives into a top-level folder
Move framework into the main app folder
Interactive htmls should go in assets so they're copied to public
Use Jade to DRY up the interactive html
Use Digest to add unique hashes to our files

This will make them play nicer with CDNs.

Because of the async nature of Node.js, I had to create a CLI interface
to digest-brunch and have it execute *after* we coffee compile the
interactives, in order for the appropriate files to be in /public.