Implemente a handful of stock screening tools

1. Mark Minervini's stage 2 template searching
2. Mark Minervini's volatility contraction pattern detection
3. Tool to calculate stock value based on RULE one principle
4. Tool to extract news from YahooFinance

Use YahooFinance API to pull stock data for screening, all the tools can run under a batch mode, which allows you to screen and analyze stocks automatically

Here is an example of TSLA's volatility contraction pattern

USAGE:

1. run runBatch_cookStock_stage2template.py to select stage2 stocks from all using template
2. run runBatch_volatility_contraction_pattern.py to select stocks with defined contraction pattern