Adding rotation classes for three dimensions

[gekkedev]

Is there any reason TW doesn't seem to have classes for CSS functions like rotateX?

I can see how one would argue with the wide range of values (0-360); but similar to the duration or delay classes, a few basic angle values for every axis like 90, 180, etc. would be for starters and then it's up to the user to extend it with custom values.
Regarding filesize: Since TW consists of modules and even better, supports tree-shaking; I don't see why some extra classes would do any harm.