Explicitly require topic from reply fixture.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2867 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/test/fixtures/reply.rb

+require 'fixtures/topic'
+
 class Reply < Topic
   belongs_to :topic, :foreign_key => "parent_id", :counter_cache => true
   has_many :silly_replies, :dependent => true, :foreign_key => "parent_id"
@@ -31,4 +33,4 @@ def validate_on_update
 end
 
 class SillyReply < Reply
-end
\ No newline at end of file
+end