[doc] Better docs

bob/bio/vein/algorithms/__init__.py

bob/bio/vein/configurations/algorithms.py

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

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

...io/vein/configurations/extractors/normalised_crosscorr.py

.../vein/configurations/extractors/repeated_line_tracking.py

bob/bio/vein/configurations/extractors/wide_line_detector.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/LocalBinaryPatterns.py

bob/bio/vein/extractors/PrincipalCurvature.py

bob/bio/vein/extractors/__init__.py

bob/bio/vein/preprocessors/__init__.py

doc/api.rst

doc/baselines.rst

doc/conf.py

doc/index.rst

doc/references.rst