Rename Util class

[soullivaneuh]

Util is a too generic name for a class and can have conflicts with other libraries.

I would suggest you to rename it on a new major version.

FilerUtil sounds better IMHO.

Regards.

[ebidel]

Want to send a PR?

[soullivaneuh]

Just tell me if I have to care with the minified version of the library and how and I will do that with pleasure. 👍

[ebidel]

Changing source is fine. I can do a new build and release. Thanks!

ps. make sure to update tests :)