Random Forest (Leo Breiman)
+ Add random forest classifier in ML/Classify.ecl
+ Add supporting functions in ML/Trees.ecl
+ Add supporting functions in ML/Sampling.ecl
+ Add example file supporting ML/Test/Explanatory/RandomForest.ecl
Changes based on Pull Request comments.
Clean comments
Merge pull request #145 from DonVitorio/RandomForest

Random Forest Classifier (Leo Breiman's algorithm)