Use scrollTop instead of colliderTop which uses the elements
offset().top, as the offset top does not account for padding.

This issue can be replicated by using a navbar-fixed-top and applying
relevant padding to the body. (A navbar-static-top with no padding on
the body does not encounter this issue)

Fixes #15078
Closes #15154 by merging it

fix travis.yml lint errors

This reverts commit b10b373c.

Resolves #14937.

Fix spelling of necolas' last name

Docs clean up - unnecessary role attributes, callout clarifications

honor wrap option in Carousel.getItemForDirection
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Specify `img` alternative text.

Docs button section restructure

Add modal autofocus example

upgrade iOS tests to 8.1

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upgrade OS X tests to Yosemite

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split .form-inline .input-group into separate docs example
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Refs #9774

Fixes #15131.

plus one example that still used the old <div role="navigation"> and a
fix-up of the callout as per
https://github.com/twbs/bootstrap/issues/15109

Fix link

bump remarkable devDependency to ~1.4.1

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Give all docs callouts IDs
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