Feed for NW.js

I have created feeds for NW.js (regular and SDK builds).

I have placed them as a pull request for http://repo.roscidus.com/, which
acts as a sort of semi-official repository for "infrastructure feeds".
See: https://github.com/0install/repo.roscidus.com/pull/21

@Jan Viehweger:
Do you think the developers of NW.js could be interested in hosting and
updating this feed themselves, perhaps listing it as an alternative under
https://nwjs.io/downloads/ ?


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