[whatwg/fetch] Stop lowercasing header names (#476)

Instead compare header names using a byte-case-insensitive match and
lowercase them when exposed through the API.

Fixes #203 and fixes #304.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/476

-- Commit Summary --

  * Stop lowercasing header names

-- File Changes --

    M fetch.bs (298)

-- Patch Links --

https://github.com/whatwg/fetch/pull/476.patch
https://github.com/whatwg/fetch/pull/476.diff

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