add scope and kwbegin

scope is just a list of statements

lib/vool/statements.rb

@@ -1,5 +1,11 @@
 module Vool
   class Statements < Statement
     attr_accessor :statements
+    def initialize(statements)
+      @statements = statements
+    end
+  end
+
+  class ScopeStatement < Statements
   end
 end