fix up actionmailer load path

actionmailer/test/abstract_unit.rb

 require File.expand_path('../../../load_paths', __FILE__)
 
+lib = File.expand_path("#{File.dirname(__FILE__)}/../lib")
+$:.unshift(lib) unless $:.include?('lib') || $:.include?(lib)
+
 require 'test/unit'
 require 'action_mailer'
 require 'action_mailer/test_case'
@@ -14,7 +17,7 @@
 FIXTURE_LOAD_PATH = File.expand_path('fixtures', File.dirname(__FILE__))
 ActionMailer::Base.view_paths = FIXTURE_LOAD_PATH
 
-class MockSMTP  
+class MockSMTP
   def self.deliveries
     @@deliveries
   end