Scholarmetrics

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* Use pyproject.toml for builds and drop pbr.
* Drop support for Python 2.7.
* Support for Python 3.6, 3.7, 3.8, 3.9 and 3.10.

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* Rename main module `scholarmetrics.scholarmetrics` to `scholarmetrics.metrics`.
* In `euclidean()` add parameter ignore_nan.
* Improve documentation.
* Use pbr for builds and drop versioneer.
* Activate codeclimate.

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* Implement gindex (2) and euclidean (3).

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* Use versioneer for versioning.

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* First release on PyPI.