refactoring

--HG--
rename : src/Ferric/Math/MachineLearning/Classifier.cs => src/Ferric/Math/MachineLearning/IClassifier.cs
work on naive bayes

--HG--
rename : src/Ferric/Math/MachineLearning.Tests/Classifiers/Linear/LeastSquaresTests.cs => src/Ferric/Math/MachineLearning.Tests/Classifiers/LeastSquaresTests.cs
rename : src/Ferric/Math/MachineLearning/Classifiers/Linear/LeastSquares.cs => src/Ferric/Math/MachineLearning/Classifiers/LeastSquares.cs
common assembly info
work on naive bayes