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catalyst/zipline
Eddie Hebert 1295f45e13 MAINT: Switch treasury curves from Series to DataFrame.
Instead of using a pandas Series of with dictionaries as the
values treasury curves, use a DataFrame which more naturally fits
the data type of a having a timeseries with mulitple values.

Should allow easier slicing/manipulation of the treasury curves,
e.g. getting 10 year curves would now be:
```
treasury_curves['10year']
```
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