redo the error handling due to the changes in DebugStackState made by James

src/main/java/lua/debug/VMException.java

@@ -0,0 +1,9 @@
+package lua.debug;
+
+public class VMException extends RuntimeException {
+	private static final long serialVersionUID = 7876955153693775429L;
+
+	public VMException(Exception e) {
+		super(e.getMessage());
+	}
+}