use :extend(.img-responsive) in Carousel's Less
Merge pull request #12621 from twbs/carousel-img-responsive-extend

use :extend(.img-responsive) in Carousel's Less
Merge branch 'master' into thumbnail-extend

Conflicts:
	dist/css/bootstrap.css
Merge pull request #12502 from ZDroid/moz

Remove redundant :-moz-placeholder styles
Merge pull request #12620 from twbs/thumbnail-extend

use :extend in thumbnail Less
property order because @zdroid <3
Merge pull request #12497 from twbs/container-fluid-is-now-a-thing

rm DIY full-width callout now that there's .container-fluid
Fixes #12611: Mention limitation of one plugin's data attributes per element
Fixes #12614: Add progress bar example with visible label
Fixes #12555: Rearrange variables to place grids and containers closer
Fixes #12526: Add scrollbars when necessary to the Dashboard example's sidebar
consistency
clarify comment
Merge pull request #12319 from twbs/address-12007

Clarify target of dropdown events
Fixes #12590: Add Korean translation link
Merge branch 'master' of github.com:twbs/bootstrap
Fixes #12477: Clarify IE support in docs
Override iOS search input's extra round corners
Merge pull request #12629 from twbs/search_inputs_ios

Override iOS search input's extra round corners
grunt for days