Checking USGS Power Curve Capabilities

[browniea]

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Making sure that all the cabablilties in this repo are in MhKiT

[ssolson]

Emily I like how this example uses pd.read_csv to fetch the data. Lets see if that works for our current request_usgs_data

We currently get IV and DV. This example calls measurements. Can you find out what this endpoint is returning and let's add it if its useful.

[ssolson]

Close #375