Aroon indicators correction
Aroon indicators correction

According to: 
https://www.tradesignalonline.com/en/lexicon/view.aspx?id=AROON+Up%2FDown+Indicator+(AROON)
http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:aroon
https://www.tradingview.com/wiki/Aroon#CALCULATION
and to the formula provided in the code "AROONDWN = (((PERIOD) - (PERIODS SINCE PERIOD LOW)) / (PERIOD)) * 100"
Numerator calculation should be period - (period - index_of_maxormin_value) not just period - index_of_maxormin_value.

I used a reversed version of the list to fix the calculation in both Indicators.
Python 2 and 3 compatible.
kylejusticemagnuson/pyti