Implemented a nice migration library.

src/main.rs

@@ -315,7 +315,7 @@ fn main() {
     set_logger(&m);
     let mut conn = get_connection(&m);
     let migrations: Vec<String> = Vec::new();
-    migrate(&mut conn, & migrations);
+    migrate(&mut conn, & migrations).unwrap();
     let mut logic = ProCommandLineLogic::new();
     process_command_line(&conn, &m, &mut logic);
 }