move the hash access stuff to arm, not sure if needed at all

lib/arm/instruction.rb

@@ -16,6 +16,24 @@ module Arm
       @attributes[:opcode]
     end
   end
+
+
+  # this is giving read access to the attributes hash via .attibute syntax
+  # so for an instruction pop you can write pop.opcode to get the :opcode attribute
+
+  # TODDO: review (don't remember what the "set_" stuff was for)
+  def method_missing name , *args , &block 
+    return super unless (args.length <= 1) or block_given?
+    set , attribute = name.to_s.split("set_")
+    if set == ""
+      @attributes[attribute.to_sym] = args[0] || 1
+      return self 
+    else
+      return super
+    end
+    return @attributes[name.to_sym]
+  end
+
 end
 
 require_relative "constants"