Change Mom to SlotMachine

rather large commit, but essentially a simple rename
Rationale in docs and blogs

test/slot_machine/macro/test_exit.rb

@@ -0,0 +1,22 @@
+require_relative "helper"
+
+module SlotMachine
+  module Builtin
+    class TestObjectExitRisc < BootTest
+      def setup
+        super
+        @method = get_compiler("Object",:exit)
+      end
+      def test_slot_length
+        assert_equal :exit , @method.callable.name
+        assert_equal 7 , @method.slot_instructions.length
+      end
+      def test_compile
+        assert_equal Risc::MethodCompiler , @method.to_risc.class
+      end
+      def test_risc_length
+        assert_equal 40 , @method.to_risc.risc_instructions.length
+      end
+    end
+  end
+end