enforces data encapsulation in vool tree

gets rid of attraccessor

lib/vool/if_statement.rb

@@ -1,11 +1,17 @@
 module Vool
   class IfStatement < Statement
-    attr_accessor :condition , :if_true , :if_false
+    attr_reader :condition , :if_true , :if_false
 
-    def initialize( cond  = nil)
+    def initialize( cond , if_true , if_false = [])
       @condition = cond
-      @if_true = []
-      @if_false = []
+      @if_true = if_true
+      @if_false = if_false
+      simplify_condition
+    end
+
+    def simplify_condition
+      return unless @condition.is_a?(ScopeStatement)
+      @condition = @condition.first if @condition.single?
     end
 
     def has_false?