Add more descriptive comments to citations for CohesiveEnergy about matminer HOT 5 CLOSED

See also the comment:

TODO: Where is this data from? -wardlt

matminer/utils/data.py:103

You can put the description in the docstring for the CohesiveEnergyData class

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@saurabh02 any update on documenting the source of the cohesive energy data?

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@saurabh02 Basically we just want to know which of these two sources, or if it was a combination of both, that you got the cohesive energy data file from:

    return [
        "@misc{, title = {{Knowledgedoor Cohesive energy handbook}}, "
        "url = {http://www.knowledgedoor.com/2/elements{\_}handbook/cohesive{\_}energy.html}}",
        "@book{Kittel, author = {Kittel, C}, isbn = {978-0-471-41526-8}, "
        "publisher = {Wiley}, title = {{Introduction to Solid State "
        "Physics, 8th Edition}}, year = {2005}}"]

If it was both, how did you handle entries that were in both sources? i.e., did you prefer one source over the other, average them etc?

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@computron sorry i missed seeing the notification for this.

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Got, it thanks! Resolved via: 481f5b6

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