Add Classifier based on Naive Bayes

[yuripourre]

Would be great to have a Classifier based on Naive Bayes.

• Add a new method to Classifier to return a Classification (category+accuracy) Classification classifyWithDetails(T feature);
• Rename Bayes's classifier to ProbabilityClassifier
• Delete IFeatureProbability
• Update current Classifiers to implement the new method. (When accuracy is unknown, it should return 1/n, n = number of categories).
• Maybe add a method getCategories()

Luckily this library already has an interface compatible with Keel's classifiers so should be easy to merge.

MIT License

https://github.com/yuripourre-forks/Java-Naive-Bayes-Classifier/blob/master/src/main/java/de/daslaboratorium/machinelearning/classifier/Classifier.java