Fix uninitialized constant when used with Rails 3

Author: smartinez87

lib/exception_notifier.rb

@@ -4,9 +4,9 @@
 class ExceptionNotifier
   def self.default_ignore_exceptions
     [].tap do |exceptions|
-      exceptions << ActiveRecord::RecordNotFound if defined? ActiveRecord
-      exceptions << AbstractController::ActionNotFound if defined? AbstractController
-      exceptions << ActionController::RoutingError if defined? ActionController
+      exceptions << ::ActiveRecord::RecordNotFound if defined? ::ActiveRecord::RecordNotFound
+      exceptions << ::AbstractController::ActionNotFound if defined? ::AbstractController::ActionNotFound
+      exceptions << ::ActionController::RoutingError if defined? ::ActionController::RoutingError
     end
   end