new file:   src/classification/ClassificationAlgorithm.java
	new file:   src/classification/tree/DecisionTreeC45.java
	renamed:    src/Data/Dataset.java -> src/data/Dataset.java
	renamed:    src/Data/DenseDataset.java -> src/data/DenseDataset.java
	renamed:    src/Data/DenseInstance.java -> src/data/DenseInstance.java
	renamed:    src/Data/Feature.java -> src/data/Feature.java
	renamed:    src/Data/Instance.java -> src/data/Instance.java
	renamed:    src/Data/SparseDataset.java -> src/data/SparseDataset.java
	renamed:    src/Data/SparseInstance.java -> src/data/SparseInstance.java