Small fix on naive_bayes classifier. When we changed the each_with_index for 0.upto, the method was returning a fixnum instead of a enum

Author: Sergio Fierens

lib/ai4r/classifiers/naive_bayes.rb

@@ -135,6 +135,8 @@ def calculate_class_probabilities_for_entry(data, prob)
             prob[prob_index] *= @pcp[index][value_index(att, index)][prob_index]
           end
         end
+        
+        prob
       end
 
       # normalises the array of probabilities so the sum of the array equals 1