Merge pull request #287 from jread-usgs/master

discharge fig w/ live NWIS data
Merge pull request #288 from jread-usgs/master

units m3/s
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removed economica data, added discharge.
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added text to legend
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added methods for discharge
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added brief drought methods
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added landsat methods
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Getting this cleaned up according to the BAOs recommendations
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new legend
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Merge pull request #293 from mwernimont/master

New legend
CFS units