Jsonapi-requests

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- Added basic orm. ([11](https://github.com/socialwifi/jsonapi-requests/pull/11))
- Added more parsers and serializers.
- Added pytest tests.
- Fix handling response 204 "No content" ([10](https://github.com/socialwifi/jsonapi-requests/pull/10))

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- Append slash to API root if needed. ([2](https://github.com/socialwifi/jsonapi-requests/pull/2))
- Allow to automatically append slash. ([4](https://github.com/socialwifi/jsonapi-requests/pull/4))
- Set headers according to JSON:API specification. ([3](https://github.com/socialwifi/jsonapi-requests/pull/3))

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- Initial lowlevel api.