Add Embed responsive utility
fix #12154
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
Fix #12025 and minify styles
fix #12007 by clarifying target of dropdown events
fixes #10495 by forcing .navbar-brand height to prevent it's inner content from increasing navbar height
Upgrade to Normalize v3-rc1 in prep for v3 final
Remove optgroup resets from #7611 since Normalize fixes those upstream
Remove #8350's reset for number inputs since Normalize fixes those upstream
refactored and renamed grid mixins
v3 instead of rc1
grunt
Merge pull request #12406 from twbs/normalize_v3

Upgrade to Normalize v3
Gruntfile.js: remove unused code.
Remove redundant jshint comment
Merge pull request #12417 from ZDroid/cmt

Remove redundant jshint comment
Merge pull request #12415 from XhmikosR/master

Gruntfile.js: remove unused code.
Rename pack.min.css to docs.min.css to match with docs.min.js
Fixes #12424: Account for Normalize change on figure element so that we don't potentially screw folks over
Fix #12422: Reset height on multiple select in input size mixin