Pan-threat-vault-python

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- Add EDL (external dynamic list) API request:

https://pan.dev/threat-vault/api/edl/

tvapi.py --note-version is deprecated for --release-notes; use
--content-version.

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- tvapi.py, tvapy.rst: Fix typo in usage.

- Documentation fixes.

- Add optional test to compare threat IDs to PAN-OS exported threat
content IDs.

- Add test for release_notes(version='latest').

- tvapi.py, tvapy.rst: Allow path or '-' (stdin) for id, name, md5,
sha256 arguments.

- tvapi.py: IOError merged into OSError as of Python 3.3.

- Rework /threats/history tests to take into account retention policy.

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- Documentation fixes and improvements.

- Add missing 'vendor' argument to /threats API request.

- Add '--cve id' argument to bin/tvapi.py.

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- Initial release.