RumbleBot random turn

src/RumbleBot.java

     protected char walkAround(char[][] grid) {
         if (steps == 0) {
             steps = random.nextInt(20);
-            return '>';
+            if(random.nextBoolean())
+                return '<';
+            else
+                return '>';
         } else {
             steps--;
             return safeMove(grid);