Fix super as statement

Super is a statement, a send really.
Not an expression (as maybe in c++)
The actual implementation will be a bit tricky, like raise, a bit of stack walking, but not impossible. Still, later

lib/ruby/send_statement.rb

@@ -8,4 +8,10 @@ module Ruby
       at_depth( depth , "#{receiver}.#{name}(#{arguments.join(', ')})")
     end
   end
+  class SuperStatement < SendStatement
+    def initialize(args)
+      super(:super , SelfExpression.new , args)
+    end
+  end
+
 end