Adds support for HTTP_RANGE requests in Django.
copied from cf-staging / django-ranged-responseIf you're in the situation that you have an authenticated Django view that returns files for download, you may have noticed that Safari 9.x doesn't play audio files properly when returning audio-files. The reason is that Safari sends a HTTP_RANGE request header and expects a proper Content-Range response header in return. The original suggested fix applies the code to Django's static view. This is a packaged version of that fix, but uses a modified FileResponse, instead of applying it to Django's static view.
