Mendeleev

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* Add `electrophilicity` index.
* Pin `sqlalchemy` version to prevent further issues with old versions, see `Issue 22 <https://github.com/lmmentel/mendeleev/issues/22>`_

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* Add `Ion` class to handle atomic ions.
* Add Github templates for bug reports, feature requests and pull requests.
* Update the values of `atomic_radius_rahm` according to corrigendum, (`PR 13 <https://github.com/lmmentel/mendeleev/pull/13>`_).
* Switch the default documentation theme to material with `sphinx-material <https://github.com/bashtage/sphinx-material/>`_.

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* Fix a ``UnicodeDecodeError`` from README.md while installing on windows.
* Code quality improvements based on `lgtm.com <https://lgtm.com/projects/g/lmmentel/mendeleev/context:python>`_

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* Fix `issue 3 <https://github.com/lmmentel/mendeleev/issues/3>`_, ``get_table('elements')`` throwing an error

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* Migrate the package from bitbucket to github
* Add Pettifor scale: ``pettifor_number`` attribute
* Add Glawe scale: ``glawe_number`` attribute
* Restore default printing of isotopic abundancies, fix issue 9
* Correct the oxidation states for Xe, fix issue 10

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* Update dipole polarizability value to the latest recommended (2018)
* Fix `issues/8/typeerror-on-some-of-the-element <https://bitbucket.org/lukaszmentel/mendeleev/issues/8/typeerror-on-some-of-the-element>`_