fixed issue where caret wouldn't inherit "active" li style on nav-pills, which caused the caret to stay blue
corrected caret colour when a nav dropdown is open
Avoid LESS nesting if isn't needed
@headingsColor → @headings-color
Merge pull request #10749 from ZDroid/patch-2

@headingsColor → @headings-color
Fixes #10755: Don't remove quotes around q element by default
Merge branch 'master' of github.com:twbs/bootstrap
Merge pull request #10741 from ZDroid/patch-1

Avoid LESS nesting if isn't needed
Merge pull request #10695 from FredericoC/fix-nav-active-caret

Fixed issue where caret wouldn't inherit "active" li style on nav-pills
Remove unused variables.
Lint assets/js/application.js and assets/js/customizer.js.
Update holder.js to v2.1.0.