Add new features on class Matrix, wrote some method on extractor.
Merge branch 'master' of ssh://git@github.com/Artiano/Artiano.git
Fixed some bugs, finished some parts of class GPCAExtractor.
Finished the main function of the class GPCAExtractor, and add some new
features on class Matrix.
Change the package linearalgebra to algebra and wrote some class for
LDAExtractor.
Merge pull request #3 from Artiano/develop

Develop