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
change `else if` to `else`
Merge pull request #9987 from wangsai/fix-typo

change `else if` to `else`
Fixes #9974

Added th selector in .table-row-variant mixin
Merge pull request #9999 from sqrt4/fix-9974

Fixes #9974
remove .btn-group

Removing this class--it's not used in the example and using it causes "bad things to happen." 

http://jsfiddle.net/josephtate/Jn6H4/
Merge pull request #10006 from jodytate/master

remove .btn-group
Merge branch 'master' of github.com:twbs/bootstrap
Update Grunt instruction links and wording
add David (david-dm.org) badge to monitor currentness of dependencies
Always wrap form examples in .bs-example; add some missing role='form'
Merge pull request #10011 from nschonni/patch-1

Update Grunt instruction links and wording
Use NPM version of grunt-html-validation

The package is now published, so the direct git url is no longer
required
Merge pull request #10034 from nschonni/use-published-version-for-grunt-html-validation

Use NPM version of grunt-html-validation
add cross-reference to .navbar-left/right in .pull-left/right docs
fix #10029