cleanup log

core/src/main/java/jef/util/Log.java

@@ -1,10 +1,8 @@
 package jef.util;
 
 public class Log {
-//    private static Log INSTANCE = new Log();
-
     public static void debug(String s) {
-        System.out.println(s);
+        System.out.println(s);//TODO implement logging
     }
 
     private Log() {