* Refactored PostSet, splitting it into PostSets::Post and PostSets::Favorite

* Additional functional tests

app/logical/post_sets/favorite.rb

@@ -0,0 +1,18 @@
+module PostSets
+  class FavoriteSet < Base
+    attr_accessor :user
+
+    def initialize(options = {})
+      super(options)
+      @user = user
+    end
+    
+    def tags
+      "fav:#{user.name}"
+    end
+
+    def load_posts
+      user.favorite_posts(:before_id => before_id)
+    end
+  end  
+end