Don't redo the iteration when loading an existing simulation

src/main.rs

@@ -114,6 +114,7 @@ fn main() {
 			let matches = matches.subcommand_matches("load").unwrap();
 			let file_name: &str = matches.value_of("filename").unwrap();
 			let mut universe = Universe::load(file_name);
+			universe.iteration += 1;
 			create_frames(&mut universe);
 		}
 		_ => {