Pymatgen-analysis-diffusion

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* Fix broken code due to pymatgen and matplotlib deprecated methods.

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* Complete migration of pymatgen.analysis.pathfinder over to pymatgen-analysis.diffusion.

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* Make MigrationHop MSONAble. (acrutt)

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* Fixed msite calc order (hmlli)
* Removed magmom (jmmshn)

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* Fix for bad release due to error in MANIFEST.in.
* DiffusionAnalyzer has been migration from pymatgen to `pymatgen.analysis.diffusion.analyzer` for a more
self-contained suite of tools for diffusion analysis.

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* pymatgen-diffusion is now released as a namespace package `pymatgen-analysis-diffusion` on PyPI. It should be
imported via `pymatgen.analysis.diffusion` instead `pymatgen_diffusion`.