An implementation of CMZ14 credentials in Rust

Ian Goldberg a7813bc519 Credential showing and verification %!s(int64=3) %!d(string=hai) anos
src a7813bc519 Credential showing and verification %!s(int64=3) %!d(string=hai) anos
tests a7813bc519 Credential showing and verification %!s(int64=3) %!d(string=hai) anos
Cargo.toml 1a145a6952 Nonblind credential issuing and verification of the resulting proof %!s(int64=3) %!d(string=hai) anos