Pip-api

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- Fix issue with subpackages (33)

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- Test against pip 19.0 to 19.1.1 (27)
- Add include_invalid argument to parse_requirements (9)
- Vendor dependencies to avoid conflicts (30, 31)

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- Handle editable installs (25)
- Ignore index url parameters in parse_requirements (25)

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- Drop support for Python 3.4
- Add support for pip 19.0, 19.0.1, 19.0.2, 19.0.3

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- Fix bug with editable requirements (22)

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- Update description (17)
- Add license (18)
- Add tests to distributions (20)