Module Discovery and verification about graft

[AdrianRossouw]

I believe that there is an need and opportunity here to demystify a lot of this stuff for people, in a way that provides a real benefit to maintainers and users.

So this is my idea for handling it:

1. resurrect and expand on @dominictarr's stream-spec project.
2. have a cli tool that evaluates the module's compatibility with the spec.
3. be able to mark up and specify testing harnesses or fixtures to bootstrap the validation.
4. build out automated testing infrastructure in the vein of zuul to run the stream tests against repos/modules on commit or publish.
5. provide a badge that can be embedded on the github /npm project pages with compatibility info.
6. build out a website that allows you to search for and evaluate stream modules based on their test results.
7. build a tool that makes it easy for module authors and contributors to integrate with our testing infrastructure, so users can submit pull requests against modules they want to make use of.

Obviously that is way too big of a project to set out to tackle up front, but I think we can make a dent in the problem if we just started to head out in this general direction.

[AdrianRossouw]

see also : https://github.com/whatwg/streams

although I suspect that the spec will be out of sync with node streams (v1, v2 and v3+), so we could never support just the whatwg spec.