Finalize Caret Preprocessing : Normalization Methods

[antoinecarme]

Add support for normalization methods, Following the issue :

Finalize Caret Preprocessing #18

support for "spatialSign", "range" methods

These two methods have an equivalent in scikit-learn (have a SQL generator) :

spatialSign <=> sklearn.preprocessing.Normalizer
range <=> sklearn.preprocessing.MinMaxScaler

https://github.com/topepo/caret/blob/master/pkg/caret/R/preProcess.R

[antoinecarme]

Added two notebooks for range and spatialSign