Ruby 1.9 compat: mark utf-8 encoding.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@9165 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionmailer/test/mail_service_test.rb

+# encoding: utf-8
 require 'abstract_unit'
 
 class FunkyPathMailer < ActionMailer::Base