[streams] First class source sink objects (#265)

Fixes #256 (/cc @jkrems).

Could use some careful review as the changes were pretty wide-ranging. I am not too worried about the algorithms---the reference implementation and its extensive test suite help with my confidence there---but the editorial changes always leave the potential for pointers, "dead code", etc.

Preview at https://streams.spec.whatwg.org/branch-snapshots/first-class-source-sink-objects/
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/265

-- Commit Summary --

  * Call underlying source functions as methods
  * Call underlying sink functions as methods.
  * Add tests for the new source/sink error cases

-- File Changes --

    M index.bs (369)
    M reference-implementation/lib/helpers.js (46)
    M reference-implementation/lib/readable-stream-abstract-ops.js (49)
    M reference-implementation/lib/readable-stream.js (35)
    M reference-implementation/lib/writable-stream.js (72)
    A reference-implementation/test/bad-underlying-sinks.js (314)
    A reference-implementation/test/bad-underlying-sources.js (239)
    M reference-implementation/test/readable-stream.js (31)
    M reference-implementation/test/writable-stream-abort.js (12)
    M reference-implementation/test/writable-stream.js (38)

-- Patch Links --

https://github.com/whatwg/streams/pull/265.patch
https://github.com/whatwg/streams/pull/265.diff

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https://github.com/whatwg/streams/pull/265