move boot* classes to boot directory

test/fragments/helper.rb

@@ -13,7 +13,7 @@ require 'parslet/convenience'
 module Fragments
   # need a code generator, for arm 
   def setup
-    @object_space = Vm::BootSpace.new "Arm"
+    @object_space = Boot::BootSpace.new "Arm"
   end
 
   def parse 

test/fragments/test_class.rb

@@ -85,7 +85,7 @@ HERE
         expr    = part.compile( @object_space.context )
       else
         expr    = part.compile( @object_space.context )
-        raise "should be function definition for now, not #{part.inspect}#{expr.inspect}" unless expr.is_a? Vm::BootClass
+        raise "should be function definition for now, not #{part.inspect}#{expr.inspect}" unless expr.is_a? Boot::BootClass
       end
     end
   end