Add next_instruction helper and bump version

src/bin/ijvm.rs

@@ -15,16 +15,14 @@ fn main() {
     let ijvmfile = &args[1];
 
     let mut machine = Machine::new_from_file(ijvmfile).unwrap();
-    while machine.has_step() {
-        match machine.step() {
-            Ok(_) => (),
-            Err(str) => {
-                println!("\n\nERROR: pc=0x{:x} fp=0x{:x}: {}\nProgram exit",
-                         machine.get_program_counter(),
-                         machine.frame.len() - 1,
-                         str);
-                return;
-            }
+    match machine.run() {
+        Ok(_) => (),
+        Err(str) => {
+            println!("\n\nERROR: pc=0x{:x} fp=0x{:x}: {}\nProgram exit",
+                     machine.get_program_counter(),
+                     machine.frame.len() - 1,
+                     str);
+            return;
         }
     }
 }