Reorganing the structure of vanilla_biometrics

bob/bio/base/pipelines/vanilla_biometrics/__init__.py

...bio/base/pipelines/vanilla_biometrics/abstract_classes.py

...base/pipelines/vanilla_biometrics/biometric_algorithms.py

bob/bio/base/pipelines/vanilla_biometrics/legacy.py

bob/bio/base/pipelines/vanilla_biometrics/mixins.py

bob/bio/base/pipelines/vanilla_biometrics/pipelines.py

bob/bio/base/test/test_transformers.py

bob/bio/base/test/test_vanilla_biometrics.py

bob/bio/base/transformers/algorithm.py

bob/bio/base/transformers/extractor.py

bob/bio/base/wrappers.py