Add Embed responsive utility
Merge branch 'responsive-embed' of https://github.com/boulox/bootstrap into boulox-responsive-embed

Conflicts:
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
Added .list-group-item.disabled

Added support for disabled List group item.
Update variables.less
add .sr-only-focusable; fixes #12259
update docs to include+use .sr-only-focusable
Documents #10140
Merge branch 'master' into document_popover_focus
add posibillity to hover links and not background in list-groups
Defined and use variables for .panel-heading & .panel-footer padding
Fix UAs required message position on grouped radio buttons

Instead of not rendering the element at all with display:none, use opacity:0 and z-index:-1 so the radio element has a defined position on the document and user agents can show the required message in the right place.
replace .visible-{size} with .visible-{size}-{display} ; fixes #8869
Correctly set .btn-link colors in a .navbar and .navbar-inverse #12694
Fixes #12756: Ensure horizontal dls are cleared by moving the clearfix out of the media query
Merge branch 'master' into pr/12813

Conflicts:
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
	docs/dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.min.css
Update modals to use more consistent padding—modal body and footer now match modal header
Remove second tbody from Supported browsers

Removed the second tbody from "Internet Explorer 8 and 9" Table
Merge pull request #12818 from hebbet/patch-1

Remove second tbody from Supported browsers
Fixes #12801: Add padding to the bottom of .form-control-static to match height of standard form controls
Merge branch 'master' of github.com:twbs/bootstrap