Fork into organization

[tkmoney]

It looks like the js api doesnt support forking into an organization even those the REST api supports it.

https://developer.github.com/v3/repos/forks/#create-a-fork

http://github-tools.github.io/github/docs/3.1.0/Repository.html#fork

Can this be added? Thanks!

[scottybo]

Seconded...

[j-rewerts]

We have a PR open in #503 , but there are some changes that need to be made.

[WJXHenry]

@j-rewerts I'll resubmit that PR with your requested changes!