title: ExceptionNotifier.notify_exception not working
body: <p>We are using this gem(<a href="https://github.com/smartinez87/exception_notification" rel="noreferrer">https://github.com/smartinez87/exception_notification</a>) with rails 3.2.11. We want to use following method "ExceptionNotifier.notify_exception(e)" from action of controller and from background process as mentioned on the wikie but we are getting following error</p>
  
  <p>undefined method `notify_exception' for ExceptionNotifier:Class</p>
  
  <p>We are installing 3.0.1 version of this gem.
  gem "exception_notification", "~> 3.0.1"</p>
  
  <p>Our rails version is 3.2.11 and ruby version is ruby 1.9.2p320.</p>
  
  <p>Thanks</p>