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Merge branch 'multiple-input-group-addon' of https://github.com/vicary/bootstrap into vicary-multiple-input-group-addon

v4: Updated form and button sizing

- Moves from no set line-height (inherited of 1.5) to declared 1.25 for
all inputs and buttons (regardless of size modifier).

- Updates padding to be `.5rem` instead of `.375rem` so that padding is
more likely to be whole numbers based on the root font-size.

- Whole numbers will be beneficial in avoiding odd fractional pixels
that can lead to misalignment as shown in #18607.

- Large buttons and inputs are now a tad wider, and smaller
buttons/inputs a tad shorter and narrower, too.

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Fixup for 365db6e3
/fyi @mdo
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https://webkit.org/b/138201 no longer repros

Wasn't able to reproduce in iOS 9.2.
So remove its entry from the Wall of Browser Bugs.
Refs #14708
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Docs: Add "Horizontal centering" subheading for .m-x-auto

Fix css3 :not selector

Assert that $grid-breakpoints and $container-max-widths are in ascending order

Fixup for 27ba4beb
/fyi @mdo
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Refs #19102
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Update npm shrinkwrap

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Add $enable-print-styles variable for _print.scss

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Fixup for #19105
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v4: Update modal sizing

- Switch from width to max-width for all widths to avoid scaling outside viewport bounds
- Rejigger the media queries for a more logical breakpoint for the large and small modal sizes
- Avoids changing the width of the default modal (nullifying #17794 and fixing #17581)

v4: Fix row-based <dl>