Basic support for arbitrary exchange source in key.ratios#45

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mwaldstein wants to merge 2 commits intobusiness-science:masterfrom mwaldstein:master

+214-122

Commits on Jun 14, 2017

Modification to tq_get to allow fetching key ratios from arbitrary exchanges.
mwaldstein
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Commits on Jun 15, 2017

Split key.ratios in two -
mwaldstein
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