Flask-hashfs

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- Replace manual proxy access of ``HashFS`` methods with single ``__getattr__`` method.

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- Pin ``hashfs`` dependency to ``>=0.3.0``. (**breaking change**)
- Rename config key ``HASHFS_LENGTH`` to ``HASHFS_WIDTH`` to be in alignment with ``hashfs>=0.3.0``. (**breaking change**)

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- First release.
- Add ``FlaskHashFS.put``.
- Add ``FlaskHashFS.get``.
- Add ``FlaskHashFS.open``.
- Add ``FlaskHashFS.delete``.
- Add ``FlaskHashFS.url_for``.