Minify css with clean-css.
Add csslint support.
Don't ignore Gruntfile, it's required for compile
Merge pull request #11780 from ZDroid/grunt-dev

Don't ignore Gruntfile, it's required for compile
Fix typo in new author meta tag
fix <button>s with .btn but missing accompanying .btn-*
fix dependency mapping of buttons and button-groups in customizer
Match customizer banner to Gruntfile banner
Merge branch 'master' of github.com:twbs/bootstrap
grunt
fix #11787: document stateful button JS
Merge branch 'master' of github.com:twbs/bootstrap
Drop grunt-recess for grunt-contrib-less & co
restore original options value
adding json
Fixes #11786: Nest media queries within print utilities for mixin-friendliness
fixups to csscomb grunt task
merge, compile
derp, don't sort min /cc @cvrebert
single array == no rogue spaces