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Possible ideas:
use the app.manifest to cache packages.
http://stackoverflow.com/questions/5264783/is-there-a-way-to-use-a-cdn-for-jquery-and-have-an-offline-web-app-via-html5/10159497#10159497
use django templating to switch between local-cdn dependencies: http://stackoverflow.com/questions/25636330/serve-static-files-with-django-both-from-cdn-and-local-directories
read this http://www.html5rocks.com/en/tutorials/appcache/beginner/
and this http://diveintohtml5.info/offline.html