make fuel an optional dependency, or factor it out to a new module, e.g. skchem_fuel

lewisacidic / scikit-chem

A high level cheminformatics package for the Scientific Python stack, built on RDKit.

http://scikit-chem.readthedocs.io/en/latest/index.html

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make fuel an optional dependency, or factor it out to a new module, e.g. skchem_fuel #44

Open lewisacidic opened 8 years ago

lewisacidic commented 8 years ago

fuel comes with quite a few dependencies that are unnecessary. We could 'polyfill' the basic in-memory functionality it provides easily, whilst offering the more advanced functionality as an optional dependency.