added tests and changed variable names

data1.hdf5

datafile1.hdf5

xbob/boosting/core/boosting.py

xbob/boosting/core/losses.py

xbob/boosting/core/trainers.py

xbob/boosting/features/local_feature.py

xbob/boosting/tests/data1.hdf5

xbob/boosting/tests/test_loss_exp.py

xbob/boosting/tests/test_loss_exp_multivariate.py

xbob/boosting/tests/test_loss_log.py

xbob/boosting/tests/test_loss_log_multivariate.py

xbob/boosting/tests/test_trainer_lut.py

xbob/boosting/tests/test_trainer_stump.py