Fixup for 365db6e3
/fyi @mdo
[skip sauce]

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
[skip sauce]

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
[skip sauce]

Refs #19102
[skip sauce]

[skip sauce]

Update npm shrinkwrap

[ci skip]

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

[skip sauce]

Fixup for #19105
[ci skip]

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>

- Using the grid classes, they still need clearfixes since rows aren't injected between them all
- Update docs to fix broken classes

v4: Revamp list group items built with anchors and buttons

- Make it an explicit class instead of qualifying with elements (.list-group-item-action)
- Rearrange the entire file for more straightforward flow
- Fix text-decoration bug as a result of the reorder
- Switch from h4's to h5's in docs
- Update docs to merge anchors and buttons sections; clearify usage guidelines there, too
- Nullify #17479 in the process

v4 - The .text-hide won't hide the text :)

Remove csscomb (soon replace it with something else) because scsslint has most of it covered already