Port ensemble. Add Display to naive_bayes (#208)

src/lib.rs

@@ -80,7 +80,7 @@ pub mod dataset;
 /// Matrix decomposition algorithms
 pub mod decomposition;
 /// Ensemble methods, including Random Forest classifier and regressor
-// pub mod ensemble;
+pub mod ensemble;
 pub mod error;
 /// Diverse collection of linear algebra abstractions and methods that power SmartCore algorithms
 pub mod linalg;