enforces data encapsulation in vool tree

gets rid of attraccessor

lib/vool/while_statement.rb

@@ -1,9 +1,17 @@
 module Vool
   class WhileStatement < Statement
-    attr_accessor :condition , :statements
+    attr_reader :condition , :statements
 
-    def initialize( condition )
+    def initialize( condition , statements )
       @condition = condition
+      @statements = statements
+      simplify_condition
     end
+
+    def simplify_condition
+      return unless @condition.is_a?(ScopeStatement)
+      @condition = @condition.first if @condition.single?
+    end
+
   end
 end