Normalizer removed unnecessary imports and changed correlation in PCA and fixed bug
Switched covariation and correlation, for faster computation.
Removed dupilicate code and file: PrincipalComponentAnalysis.java

added to PCA.java the missing PrincipalComponentAnalysis.java functions.
Replacement of colt with parallelcolt
Checked some code and fixed warnings
Checked code and fixed warnings (methylation package)
Initial release of new DoubleMatrixDataset
Updated DoubleMatrixDataset_v2
Renamed DoubleMatrixDataset_v2 > DoubleMatrixDataset2
Merge pull request #27 from Bonder-MJ/master

DoubleMatrixDataset2, removed duplicated PCA code, replacement of colt with parallelcolt, fixed warnings and reviewed code.