Add test case of min-max normalization for different vector
Add csv label loader class (help to load first or last column as label)
Add csv label appender for append label to csv formatter
Add csv label appender for first and last column as label
Add LibsvmFormatter
Merge branch 'change_csv_label_loading_and_saving'

Conflicts:
	MLFormatChanger/src/com/tantinevincent/vector/test/DenseVectorTestCase.java
Add Libsvm formatter test case and fix bug of label in string builder