Audfactory

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* Added: ``audfactory.path_to_group_id()``

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* Added: test coverage
* Added: ``audfactory.rest_api_get()``
* Added: ``audfactory.`rest_api_search()``
* Added: ``audfactory.authentification()``
* Deprecated: ``audfactory.rest_api_request()``
* Removed: ``audfactory.download_artifacts()``

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* Fixed: ``audfactory.pom.license()`` now doesn't fail for empty license
entries

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* Changed: improve progress bars for downloads

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* Added: Python 3.8 support
* Added: ``audfactory.upload_artifact()``
* Added: ``audfactory.download_artifact()``
* Changed: add ``repository`` as optional argument instead config value
* Deprecated: ``audfactory.download_artifacts()``
* Removed: Python 3.5 support

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* Added: ``audfactory.sort_versions()``