Merged the Object Daddy exemplars from trunk. r3337, r3340, r3342

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/0.9-stable@3359 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/exemplars/document_exemplar.rb

@@ -0,0 +1,9 @@
+class Document < ActiveRecord::Base
+  generator_for :title, :method => :next_title
+
+  def self.next_title
+    @last_title ||= 'Document001'
+    @last_title.succ!
+    @last_title
+  end
+end