moving know_object out of the base class

object is only common to constant and object slots (which should be unified)
On the way to making the array recursive

test/slot_machine/helper.rb

@@ -1 +1,9 @@
 require_relative '../helper'
+
+module SlotMachine
+  class InstructionMock < Instruction
+    def initialize
+      super("mocking")
+    end
+  end
+end