modifcation in tests and optimization of code

outputstat

setup.py

xbob/boosting/core/boosting.py

xbob/boosting/core/trainers.py

xbob/boosting/features/local_feature.py

xbob/boosting/scripts/mnist_multi_block_lbp.py

xbob/boosting/tests/test_dlbp_features.py

xbob/boosting/tests/test_lbp_features.py

xbob/boosting/tests/test_loss_exp.py

xbob/boosting/tests/test_tlpb_features.py

xbob/boosting/tests/test_trainer_stump.py