Merge branch 'master' of github.com:bioidiap/bob.learn.linear

bob/learn/linear/cpp/whitening.cpp

bob/learn/linear/include/bob.learn.linear/whitening.h

bob/learn/linear/lda.cpp

bob/learn/linear/logreg.cpp

bob/learn/linear/machine.cpp

bob/learn/linear/main.cpp

bob/learn/linear/pca.cpp

bob/learn/linear/test.py

bob/learn/linear/wccn.cpp

bob/learn/linear/whitening.cpp