proper var
Use `outline: 0` consistently
Merge pull request #12999 from ZDroid/outline-zero

Use `outline: 0` consistently
Merge branch 'master' of github.com:twbs/bootstrap
grunt
fix #12771
Merge branch 'master' into modular-the-mixins

Conflicts:
	dist/css/bootstrap.css.map
	docs/assets/js/raw-files.min.js
	docs/dist/css/bootstrap.css.map