Fixes to Maximum Curvature implementation; Improved references & documentation

bob/bio/vein/extractor/MaximumCurvature.py

bob/bio/vein/tests/extractors/image.hdf5

bob/bio/vein/tests/extractors/mask.hdf5

bob/bio/vein/tests/extractors/mc_bin_matlab.hdf5

bob/bio/vein/tests/extractors/mc_g_matlab.hdf5

bob/bio/vein/tests/extractors/mc_vt_matlab.hdf5

bob/bio/vein/tests/extractors/miuramax_input_fvr.mat

bob/bio/vein/tests/extractors/miuramax_input_img.mat

bob/bio/vein/tests/extractors/miuramax_output.mat

bob/bio/vein/tests/test.py