Rename Genesis to Mint

Genesis is a story of creation. We should only use that term to
for the event log that bootstraps the system.

src/lib.rs

@@ -5,7 +5,7 @@ pub mod transaction;
 pub mod event;
 pub mod entry;
 pub mod log;
-pub mod genesis;
+pub mod mint;
 pub mod logger;
 pub mod historian;
 pub mod accountant;