Added and updated some more object daddy exemplars.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3342 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/exemplars/group_exemplar.rb

@@ -0,0 +1,10 @@
+class Group < Principal
+  generator_for :lastname, :method => :next_lastname
+
+  def self.next_lastname
+    @last_lastname ||= 'Group'
+    @last_lastname.succ!
+    @last_lastname
+  end
+
+end