fixes for upgrade schema script

test/factories/post_flag.rb

@@ -1,3 +1,4 @@
 Factory.define(:post_flag) do |f|
   f.reason "xxx"
+  f.is_resolved false
 end

test/factories/tag.rb

@@ -3,6 +3,7 @@ Factory.define(:tag) do |f|
   f.post_count 0
   f.category {Tag.categories.general}
   f.related_tags ""
+  f.related_tags_updated_at {Time.now}
 end
 
 Factory.define(:artist_tag, :parent => :tag) do |f|

test/factories/user.rb

@@ -6,6 +6,7 @@ Factory.define(:user) do |f|
   f.default_image_size "medium"
   f.base_upload_limit 10
   f.level 20
+  f.last_logged_in_at {Time.now}
 end
 
 Factory.define(:banned_user, :parent => :user) do |f|