Add invalidation-paths option for CloudFront.

[mynomoto]

Replaces the list of changed files that is passed by default.

Fixes #21

[martinklepsch]

@mynomoto sorry I'm getting back to this so late. I did a bunch of other stuff in master now that make your PR conflict. Very sorry about that, should have checked for outstanding PRs first...

Either way if you're up for updating your PR I'd be happy to merge it in otherwise I can also just re-implement it myself. Let me know what you prefer, definitely fine to do it myself but want to give you the opportunity to contribute your own improvement :)

[mynomoto]

@martinklepsch It's rebased now, let me know if anything else is needed.

[martinklepsch]

Thanks @mynomoto! 👏