iang/cmz: An implementation of CMZ14 credentials in Rust @ 25d8613783f80c6d47206d53bfcb4062190acd44

Ian Goldberg 25d8613783 Remove most types in let statements		%!s(int64=3) %!d(string=hai) anos
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ggm.rs	25d8613783 Remove most types in let statements	%!s(int64=3) %!d(string=hai) anos
lib.rs	c6f37a1833 Be able to create Issuers and their private and public keys	%!s(int64=3) %!d(string=hai) anos