Add Tanh and ZNorm preprocessors

bob/fusion/base/__init__.py

bob/fusion/base/algorithm/AND.py

bob/fusion/base/algorithm/Algorithm.py

bob/fusion/base/algorithm/AlgorithmBob.py

bob/fusion/base/algorithm/Empty.py

bob/fusion/base/algorithm/MLP.py

bob/fusion/base/algorithm/Weighted_Sum.py

bob/fusion/base/algorithm/__init__.py

bob/fusion/base/algorithm/mlp_train_helper.py

bob/fusion/base/config/algorithm/gmm.py

bob/fusion/base/config/algorithm/llr.py

bob/fusion/base/config/algorithm/llr_skl.py

bob/fusion/base/config/algorithm/mean.py

bob/fusion/base/config/algorithm/mlp.py

bob/fusion/base/config/algorithm/plr_2.py

bob/fusion/base/config/algorithm/plr_3.py

bob/fusion/base/preprocessor/Tanh.py

bob/fusion/base/preprocessor/ZNorm.py

bob/fusion/base/preprocessor/__init__.py

bob/fusion/base/script/boundary.py