optionally cache downloaded files
Merge branch 'master' into pull-fixture-caching
pull fixture cache implemented / working
implemented remove_gz_suffix

this method is used to remove ‘.gz’ from the end of strings. It’s used
to get the correct cache file name for fixtures that are stored
compressed on S3 but uncompressed locally.
putting in django-appconf to tidy up settings
Merge pull request #7 from gizmag/pull-fixture-caching

Pull fixture caching