[heycam/webidl] Make the grammar check more robust. (#688)

In particular, fail immediately if the server returns with an error, and yield
a readable error if no grammar snippets are found in the specification.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/688

-- Commit Summary --

  * Make the grammar check more robust.

-- File Changes --

    M check-grammar.js (4)
    M deploy.sh (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/688.patch
https://github.com/heycam/webidl/pull/688.diff

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https://github.com/heycam/webidl/pull/688