adds self reference and improve methods a little

lib/ast/basic_expressions.rb

@@ -34,6 +34,7 @@ module Ast
     # otherwise it's a method without args and a send is ussued.
     # this makes the namespace static, ie when eval and co are implemented method needs recompilation
     def compile frame , method
+      return Virtual::SelfReference.new() if name == :self
       if method.has_var(name)
         frame.compile_get(method , name )
       else