Add debug information

src/main/java/be/cylab/java/wowa/training/MainDL4J.java

@@ -21,6 +21,8 @@ public final class MainDL4J {
         LearningNeuralNetwork lnn
                 = new LearningNeuralNetwork("webshell_data.csv");
         for (int neurons_number = 5; neurons_number < 50; neurons_number++) {
+            System.out.println("Number of neurons in hidden layer : "
+                    + neurons_number);
             lnn.learning(neurons_number);
         }