Move blog tab accessor and class array to blog file from tab file

lib/refinery/blog.rb

@@ -12,11 +12,17 @@ module Refinery
     autoload :Tab, 'refinery/blog/tabs'
 
     class << self
-      attr_accessor :root
+      attr_writer :root
+      attr_writer :tabs
+
       def root
         @root ||= Pathname.new(File.expand_path('../../', __FILE__))
       end
       
+      def tabs
+        @tabs ||= []
+      end
+
       def version
         ::Refinery::Blog::Version.to_s
       end

lib/refinery/blog/tabs.rb

@@ -1,11 +1,5 @@
 module Refinery
   module Blog    
-    attr_accessor :tabs
-
-    def self.tabs
-      @tabs ||= []
-    end
-    
     class Tab
       attr_accessor :name, :partial