Remove unused Capistrano depdendencies
As we're now not deploying Capistrano bundles or doing any RVM workarounds, let's remove these gems that are only adding extra KBs.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
As we're now not deploying Capistrano bundles or doing any RVM workarounds, let's remove these gems that are only adding extra KBs.