adds missing updaters

to forum posts, comments, and artist versions

app/models/artist_version.rb

@@ -1,5 +1,5 @@
 class ArtistVersion < ActiveRecord::Base
-  belongs_to :updater
+  belongs_to :updater, :class_name => "User"
   belongs_to :artist
 
   def self.search(params)

app/models/comment.rb

@@ -3,6 +3,7 @@ class Comment < ActiveRecord::Base
   validates_format_of :body, :with => /\S/, :message => 'has no content'
   belongs_to :post
   belongs_to :creator, :class_name => "User"
+  belongs_to :updater, :class_name => "User"
   has_many :votes, :class_name => "CommentVote", :dependent => :destroy
   before_validation :initialize_creator, :on => :create
   before_validation :initialize_updater

app/models/forum_post.rb

@@ -2,6 +2,7 @@ class ForumPost < ActiveRecord::Base
   attr_accessible :body, :topic_id, :as => [:member, :builder, :janitor, :privileged, :platinum, :contributor, :admin, :moderator, :default]
   attr_accessible :is_locked, :is_sticky, :is_deleted, :as => [:admin, :moderator, :janitor]
   belongs_to :creator, :class_name => "User"
+  belongs_to :updater, :class_name => "User"
   belongs_to :topic, :class_name => "ForumTopic"
   before_validation :initialize_creator, :on => :create
   before_validation :initialize_updater