Kill trailing whitespace in ruby files

app/logical/post_sets/favorite.rb

@@ -1,28 +1,28 @@
 module PostSets
   class Favorite < Base
     attr_reader :user, :page, :favorites
-    
+
     def initialize(user_id, page = 1)
       @user = ::User.find(user_id)
       @favorites = ::Favorite.for_user(user.id).paginate(page).order("favorites.id desc")
     end
-    
+
     def tag_array
       @tag_array ||= ["fav:#{user.name}"]
     end
-    
+
     def tag_string
       tag_array.uniq.join(" ")
     end
-    
+
     def humanized_tag_string
       "fav:#{user.pretty_name}"
     end
-    
+
     def posts
       favorites.includes(:post).map(&:post)
     end
-    
+
     def presenter
       @presenter ||= ::PostSetPresenters::Favorite.new(self)
     end