Add ARIMA Normalization Functionality#89

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ml874 wants to merge 10 commits intogoldmansachs:masterfrom

ml874:add-arima

Commits on Jan 29, 2020

add arima functionality
ml874
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Commits on Feb 13, 2020

fixed arima functionality
ml874
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Commits on Feb 26, 2020

added moving average component to arima
ml874
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Commits on Mar 18, 2020

additional changes, pep8 formatting
ml874
committed

Commits on Apr 2, 2020

additional changes, modified test file
ml874
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Commits on Apr 7, 2020

moved arima normalization to econometrics.py
ml874
committed

Commits on Apr 8, 2020

remove arima from timeseries __init__.py
ml874
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Commits on Apr 20, 2020