Reminder to fix up animate.js

[matsko]

Once #8974 goes then the following needs to be done for ngAnimate/animate.js.

1. Properly document the options API param and provide info on how to use temporary class name values.
2. Fix the options param such that it only accepts strings or object params.
3. Improve the quality of the tests here: https://github.com/angular/angular.js/blob/master/test/ngAnimate/animateSpec.js#L2459

[Narretz]

Please triage your own issues. 😄