Adds a EE specific dev favicon
After the introduction of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9260 @annabeldunstone and @filipa requested an ee specific version
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
After the introduction of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9260 @annabeldunstone and @filipa requested an ee specific version