Implementation Process - naive_bayes method

[antoinecarme]

for multiclass classification

As described in issue #2

references :

https://cran.r-project.org/web/packages/naivebayes/index.html
https://cran.r-project.org/web/packages/naivebayes/naivebayes.pdf
https://github.com/cran/naivebayes
https://github.com/topepo/caret/blob/master/models/files/naive_bayes.R

[antoinecarme]

Added naive bayes classification models support