More clean-up and documentation

bob/bio/vein/algorithms/HammingDistance.py

bob/bio/vein/algorithms/MiuraMatch.py

bob/bio/vein/configurations/algorithms.py

bob/bio/vein/configurations/extractors/maximum_curvature.py

bob/bio/vein/configurations/grid/gpu.py

bob/bio/vein/configurations/grid/gpu2.py

bob/bio/vein/configurations/grid/gpu3.py

...onfigurations/preprocessors/finger_crop_None_CircGabor.py

.../vein/configurations/preprocessors/finger_crop_None_HE.py

...vein/configurations/preprocessors/finger_crop_None_HFE.py

...ein/configurations/preprocessors/finger_crop_None_None.py

bob/bio/vein/extractors/MaximumCurvature.py

bob/bio/vein/extractors/PrincipalCurvature.py

bob/bio/vein/extractors/__init__.py

bob/bio/vein/preprocessors/FingerCrop.py

bob/bio/vein/tests/test.py

bob/bio/vein/utils.py

buildout.cfg

doc/baselines.rst

requirements.txt