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Using Cloud Storage could generate urls like:

`https://storage.googleapis.com/<BUCKET_NAME>/<PATH>/testwebm?Expires=1612931745&GoogleAccessId=<ACCOUNT>&Signature=<SIGNATURE>`

Passing parameters to the URL returns None in mime.guess_type(url)

Also, extracting the mimetype to some property that can be reused. Similar to https://github.com/wagtail/wagtail/blob/master/wagtail/documents/models.py#L170

Conditionally show some things only if modeladmin is installed, addded links for editing/adding tracks

Change to use packaging.version to compare version numbers (because string comparison means 2.10 > 2.7 is not True)

Bump version number

iSorted

Allow unauthenticated for travis ci

Bump isort

iSort tests

This allows keeping the videos on S3, for example, although this does
require downloading the video from S3 that you just uploaded.

Django throws a warning if you paginate a queryset without an explicit
ordering.

Instead of fixing anything it just entered an infinite loop.

Fix for #17.
Fixes flake8 and isort issues.