Update JSCS rules

Multiple tooltip triggers don't play well together

Document Affix plugin's `checkPosition` method

Added #panels-footer to components nav in docs

Fix radio and checkbox keyboard handling in .btn-group

Doc that 'manual' is mutex of other tooltip/popover triggers

Closes #16122
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when used with a sticky footer layout.
Adds visual test for affix with sticky footer.

Closes #15694.
Refs #15032.

Fixes #16361
Refs #16356
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Include entire /grunt/ folder in npm package

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Overall logic for this test appears broken, possibly relating to an
older version of Bootstrap that did not require explicit
`data-toggle="button"` on single toggle buttons?

Fix for problem that emerged from #16226 (`.active` class not actually
being applied) and expansion of the script to also correctly handle
keyboard interaction with checkboxes in `data-toggle="button"` groups

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

Fixes issue #16008

Scope anchorjs to immediate children