use factory to generte intergers in space

start with just integer factory in space
change all the hand-out code
still #14

test/risc/test_linker.rb

@@ -25,7 +25,7 @@ module Risc
       assert_equal 0 ,  Position.get(@linker.cpu_init).at
     end
     def test_cpu_at
-      assert_equal "0x76ec" ,  Position.get(@linker.cpu_init.first).to_s
+      assert_equal "0xb12c" ,  Position.get(@linker.cpu_init.first).to_s
     end
     def test_cpu_label
       assert_equal Position ,  Position.get(@linker.cpu_init.first).class