#1.1.0 : improved imports for basic functions
#1.0.7 :
   remove ridge dependency by using MASS function lm.ridge
   Add a new BoxPlot function with confidence intervals and anova integrated
#1.0.5 enhanced documentation
#0.15.4
Changing random generator in C to use runif() instead.
#0.14.3
bug removal when X was a data.frame in density_estimatione