* fix form-inline with flex enabled
* grunt
* fix alignment of labels
* shorter if syntax
* add new form example to docs for now
* update inline form docs usage guidelines
* responsive margins
* better margin utils
* fix sizing of .form-check
* flexbox alignment of .form-check
* no need to change direction
* support custom controls in inline form, for default and flex modes
* add example of custom select and checks to docs
* remove hidden and visible label variants since we cover that in the usage guidelines at the start and include hidden labels everywhere
* use property value instead of layout name
* apply to all labels
* add a visible label, space it out
* add id

* Add rounded-0 class

* grunt

* add border utilities for removing borders

* clean up comments

* add basic border docs

* docs styles for border utils

Fixes #19107.

in carousel example, replace img-circle by rounded-circle css class

grid-breakpoint fix [document]

v4 disabled navbar links

Update .table-responsive

Wrap .fade and .collapsing transition properties in $enable-transitions

Tweak modal sizes

Button toggling - trigger change event on input. Fixes #16673, fixes #17599.

Carousel - Do not prevent on keydown for input and textarea

See https://travis-ci.org/twbs/bootstrap/jobs/179010884 for build failure

Update use of $gray-lightest variable

Dropdown perf - on keyboard nav, find active item in the active dropdown rather than the whole document (#19953)

grid-breakpoint for sm is 576px
https://github.com/twbs/bootstrap/blob/v4-dev/scss/_variables.scss#L186

current document shows 544px, but it should be 576px