quick fix for docs mention
Add role="toolbar" to elements with .btn-toolbar.
add variables for heading font sizes; fixes #9921
regenerate customizer's raw-files.js
add header font size vars to customizer page
Merge branch 'master' of github.com:twbs/bootstrap
add David (david-dm.org) badge to monitor currentness of dependencies
Always wrap form examples in .bs-example; add some missing role='form'
add cross-reference to .navbar-left/right in .pull-left/right docs
Merge pull request #10040 from twbs/pull-navbar-docs

add cross-reference to .navbar-left/right in .pull-left/right docs
Merge pull request #10012 from twbs/david-badge

add David (david-dm.org) badge to monitor currentness of dependencies
add blog link to homepage
Merge branch 'master' of github.com:twbs/bootstrap
fixes #9880: use correct grid classes on jumbotron example
docs: add explanation for adding tooltips to disabled elements, closes #10049
fix #10070 by resyncing fieldset disabled live example & example code
fixes #9879: add hover state to theme buttons
fixes #9877: improve active state on nav list items in theme
Merge branch 'master' of github.com:twbs/bootstrap

Conflicts:
	css.html
Merge pull request #10081 from bcarrell/master

docs: add explanation for adding tooltips to disabled elements