CustomEvents Polyfill breaks Android 4.0-4.3

[fspoettel]

Solution: Use this polyfill instead

[peduarte]

Thanks!

[peduarte]

Hey, I've released a v2 of the slider, is this still breaking?

[crisbeto]

It still is @peduarte. I just got the same error in Safari 5.1.7.

I've opened a PR with a fix. It just needs a null check. I've tested it and it works, although CircleCI failed because of a ELIFECYCLE error, afaik its Node-related.

[peduarte]

@crisbeto Nice one man!