Merge branch 'cleanup_cosmo' into 'master'

README.md

src/csds_cosmology.cpp

src/csds_cosmology.hpp

src/csds_interpolation.hpp

src/csds_parameters.cpp

src/csds_parameters.hpp

src/csds_parser.cpp

src/csds_parser.hpp

src/csds_particle.hpp

src/csds_reader.cpp

src/csds_reader.hpp

src/csds_reader_generate_index.cpp

tests/testInterpolation.cpp

tests/testParser.cpp