Upgrade coffee-rails to 4.1.1
Includes Rails 5 support.
[See Changelog for more info](https://github.com/rails/coffee-rails/blob/master/CHANGELOG.md#411-dece mber-18-2015).
Working towards #14286 (moved).
cc: @rspeicher
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Includes Rails 5 support.
[See Changelog for more info](https://github.com/rails/coffee-rails/blob/master/CHANGELOG.md#411-dece mber-18-2015).
Working towards #14286 (moved).
cc: @rspeicher