disable nginx proxy cache #545 (ka-lite non-static content not to be cached)
Merge pull request #554 from gimick/nginx_nocache

disable nginx proxy cache #545 (ka-lite non-static content not to be cached)
Merge branch 'release-idoc' of github.com:learningequality/ka-lite into release-0.10
Merge branch 'release-0.10' of github.com:learningequality/ka-lite into cache_by_version
moving import to top of file, adding comment to version.py