Datascientists

- Add module `statisticalTest`
- Return a proper Statistical Test for users' requirements.
- Add module `simulation`
- Move all methods from `hypothesisTesting` to `simulation`
- Add method `chisquare`, which returns a DataFrame object of Chi-Square test.
- Bug fix: `simulation.bootstrapping`
- Correct the spelling false. Change `bootstraping` to `bootstrapping`
- Move parameter `repetition` from method `bootstrapping` to class `hypothesisTesting`
- Update: `simulation.histogram`
- Now support turn off display CI on plot, which controlled by argument `show_CI=False`
- Update: `README.md`
- Add Dev Version link

- Update README.md.
- Add Best Practices.
- Update `preprocessing.standardize`.
- Now support standardizing specified columns of df by passing argument `columns`.
- Update `regression.linearRegression`.
- Now support group by data based on labels from a column by passing argument `colorGroupBy`.

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- Launch project from project ds_zacks

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