[heycam/webidl] Add the symbol type (#377)

Fixes part of https://www.w3.org/Bugs/Public/show_bug.cgi?id=27553. Fixes #301.

This will be necessary for https://github.com/whatwg/dom/pull/469, as feedback in https://github.com/whatwg/dom/issues/208 has been that we should restrict the type of the group to either a string or a symbol.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=27553 also contains speculative stuff about interfaces declaring their own symbols which is not included here.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/377

-- Commit Summary --

  * Add the symbol type

-- File Changes --

    M index.bs (55)

-- Patch Links --

https://github.com/heycam/webidl/pull/377.patch
https://github.com/heycam/webidl/pull/377.diff

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