Flask-fs2

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- CGWire will maintain this fork
- Flask-FS2 requires Python 3.7+ and Flask/Werkzeug 2.0.0+
- Remove all code related to Python 2
- Added ``read_chunks()`` operations
- Add region configuration for Swift and S3

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- Fix a race condition on local backend directory creation
- Proper content type handling on GridFS (thanks to rclement)

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- Added ``copy()`` and ``move()`` operations
- ``delete()`` now supports directories (or prefixes for key/value stores)
- Improve ``metadata()`` ``mime`` handling
- Added explicit ``ImageField.full(external=False)``

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- Fix ``local`` backend ``list_files()`` nested directories handling

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- Added ``metadata`` method to ``Storage`` to retrieve file metadata
- Force ``boto3 >= 1.4.5`` because of API change (lifecycle)
- Drop Python 3.3 support
- Create parent directories when opening a local file in write mode

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- Fix broken packaging for Python 2.7