Added functionality for portal targets + fix conflicts & CI

[Hypnosphi]

This is a fix for #100

[robinfehr]

thank you! 👍

[kevinahuber]

This is great! 👍

[princed]

@tajo Is there a chance it could be merged?

[davideickhoff]

any new plans for merging?

[princed]

In the meanwhile, feel free to use our scoped package (https://github.com/Hypnosphi/react-portal/tree/scoped). No warranties whatsoever.

[arronhunt]

Bumping for this one

[Hypnosphi]

I've rebased our branch to fit into the new project structure

[ablamunits]

@Hypnosphi Thank you for this, I am using this off of your forked repo.
@tajo Any chance this will be merged here? Could be awesome.

[tajo]

Hey, please check the new major version (complete rewrite) of react-portal: #157

It's React v16 only since its uses the new official Portal API. There is the first beta released and I would like to get your feedback. I don't have bandwidth to maintain v3 which is very different and full of hacks.

If you feel your PR still applies, please rebase it against the master and re-open it. Sorry for the lack of response in past! Thanks!