[streams] Make .ready fulfill-only (#248)

Closes #245. Review appreciated!
You can merge this Pull Request by running:

  git pull https://github.com/whatwg/streams ready-fulfill-only

Or you can view, comment on it, or merge it online at:

  https://github.com/whatwg/streams/pull/248

-- Commit Summary --

  * Make readable stream's ready promise fulfill-only
  * Make writable stream's ready promise fulfill-only

-- File Changes --

    M Examples.md (53)
    M index.bs (49)
    M reference-implementation/lib/readable-stream.js (21)
    M reference-implementation/lib/writable-stream.js (16)
    M reference-implementation/test/pipe-to.js (22)
    M reference-implementation/test/readable-stream.js (22)
    M reference-implementation/test/transform-stream-errors.js (14)
    M reference-implementation/test/utils/readable-stream-to-array.js (24)
    M reference-implementation/test/writable-stream-abort.js (22)
    M reference-implementation/test/writable-stream.js (110)

-- Patch Links --

https://github.com/whatwg/streams/pull/248.patch
https://github.com/whatwg/streams/pull/248.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/streams/pull/248