Prod.html: no need for Lighttable integration.
Project.clj: reenabled cljsbuild development and test build targets.
Core.cljs: moved undo to internal function instead of one living in the global namespace - this way we can use the Google Closure compiler's advanced compilation mode.
Core.cljs: moved add-watch behind setting of intial app state - still have a problem where undo clears all columns of cards :(