An implementation of CMZ14 credentials in Rust

Ian Goldberg c446828be7 Refactor the two types of credential issuing each into their own submodule 3 rokov pred
src c446828be7 Refactor the two types of credential issuing each into their own submodule 3 rokov pred
tests c446828be7 Refactor the two types of credential issuing each into their own submodule 3 rokov pred
Cargo.toml 1a145a6952 Nonblind credential issuing and verification of the resulting proof 3 rokov pred