Run spec update to add support for amp-mathml, amp-riddle-quiz, amp-wistia-player, amp-byside-content, amp-bind-macro

[adamsilverstein]

Includes updates to other elements and attributes in the validator spec.

Fixes #941

[westonruter]

@adamsilverstein does this successfully result in amp-mathml elements not being removed?

Could you add a test to test-tag-and-attribute-sanitizer.php to verify that a valid amp-mathml element survives validation and also that the sanitizer automatically picks up the amp-mathml component script?

For example:

https://github.com/Automattic/amp-wp/blob/c701b0b8614e4b454bf620950018d0f143796d3c/tests/test-tag-and-attribute-sanitizer.php#L156-L160

[adamsilverstein]

It should, I see the tags added to the generated file: https://github.com/Automattic/amp-wp/pull/943/files#diff-a761ebd1d4f764d95add0829d1378635R1325

I'll add some tests for this and other new amp-html tags I see added to the validation file.

[adamsilverstein]

@westonruter I added tests for the new components I see in the pr that had matching docs at https://www.ampproject.org/docs/reference/components - namely amp-mathml, amp-riddle-quiz, amp-wistia-player, amp-byside-content & amp-bind-macro. I tried amp-facebook-page, but I think it is too new and not in production (https://github.com/ampproject/amphtml/blob/9673d3fe860d5d61eb9b1193fc2a49b59cdf094c/extensions/amp-facebook-page/amp-facebook-page.md), the test failed so I removed it.

[westonruter]

This is great. Thanks!

[westonruter]

Behold: amp-mathml rendered in a WordPress post!