Version 1.5.0
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*  support statistical descriptions that can be used in paper and subgroup analyis
*  adjust covariates in regression models and subgroup regression analysis
*  update plot method for regression




Version 1.0.0
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*  support variable names or indexes in 'display.data.frame'
*  minor modifications in 'reg' to support COX regreesion


Version 0.0.3
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*  support variable names or indexes in 'reg'
*  minor modifications in 'dataframe.reg' and 'plot.reg' function




Version 0.0.2
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* add argument to dislay.data.frame so it can have better performance when display character or factor variables with many unique values.
* add a package news file
* change the vignette

Version 0.0.1
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First build
* Extract results from regression models and plot the effect size using 'ggplot2' seamlessly.