Include entire /grunt/ folder in npm package

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Remove role="button"

Downgrade ZeroClipboard for IE8 support

This reverts commit 229e8889.

ZeroClipboard v2.x drops IE < 9 support.

dropdowns.less: Add space before IE8 workaround.

This in turn works around an issue with clean-css (fixed in 3.2.6). So this basically is just a consistency change.

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Bump grunt-saucelabs to v8.6.1

Scope anchorjs to immediate children

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Tooltip/popover: Fix auto placement to use viewport

More bower.json fixes

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Per https://github.com/bower/bower.json-spec/commit/a325da3d79baab018c572d75dc1781b12322f6cd

bower.json: set `moduleType` to `globals`

Per https://github.com/bower/bower.json-spec/commit/632ff90a2c857e9cb4a4236e8ddb069cc0716865#commitcomment-10914138
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Otherwise, the test doesn't properly fail when the fix is reverted.

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Closes #16142 by merging it.

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Taken from https://github.com/ai/autoprefixer-rails/blob/master/vendor/autoprefixer.js

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Fixes #16270.

DOCS: Separation of .dropdown and .dropup.