Provide a compatibility version with v4

[eltonmesquita]

animate's next version will include a major breaking change, class prefix (aka namespace), and this will make a direct update from previous versions harder and I see a lot of issues popping on this issue tracker related to this feature in the future.

It would be easy to provide a file for compatibility with previous versions (like animate.compat.css). The question is, should we provide this file out of the box in the new release?

We need as much feedback as we can get relating to this as it will be one of the biggest change in the whole library's story.

[eltonmesquita]

@warengonzaga, what do you think about this?

[warengonzaga]

@eltonmesquita it would be nice to add that one since as you said it is a breaking changes for the entire library I saw some website is highly dependent on animate.css as their animation library. For that's okay.

[warengonzaga]

@eltonmesquita I don't see this update in the current build...

[eltonmesquita]

It's now available on the dev branch.