Carousel is not animated

Bug description:

The carousel transitions are not animated and therefore, are not sliding.
The slides are missing classes called carousel-item-next, carousel-item-left/right.
Due to the lack of these classes during transition, the slides are not animated. You can see this behaviour, while debugging the original carousel on the bootstrap documentation page https://getbootstrap.com/docs/4.0/components/carousel/#with-indicators

Link to minimally-working plunker that reproduces the issue:

http://plnkr.co/edit/GXzJpDL0E5jF0wDYvvv2?p=preview

Version of Angular, ng-bootstrap, and Bootstrap:

Angular: 4.0.3

ng-bootstrap: 1.0.0-beta.3

Bootstrap: 4.0.0-beta

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