Mendeleev

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* Fix `issues/6/type-of-block-is-wrong <https://bitbucket.org/lukaszmentel/mendeleev/issues/6/type-of-block-is-wrong>`_

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* Added ``mendeleev_number`` attribute to elements.
* Added footnotes to the data documentation.

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* Fixed issue 3: encoding issue in econf.py.

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* Corrected passing integers to the CLI script.
* Various documentation readability and structure improvements.

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* The elements can now be directly imported from :doc:`mendeleev </index>` by symbols.
* Added `sphinxcontrib.bibtex <http://sphinxcontrib-bibtex.readthedocs.io/en/latest/>`_ extension
to the docs to handle `BibTeX <http://www.bibtex.org/>`_ style references to improve
handling of the bibliographic entries.
* Added `nbsphinx <https://nbsphinx.readthedocs.io>`_ to include `Jupyter Notebook <http://jupyter.org/>`_
tutorials in the docs.

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* Added API documentation
* Corrected the sphinx configuration
* Updated the documentation