Fixes #14348: Add visibility styles to collapse and tab content to match .hidden
fix nav links to end with / to avoid 301 redirect
Merge branch 'master' into sr_friendly_hidden_content

Conflicts:
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
typo
Merge pull request #14444 from twbs/sr_friendly_hidden_content

More screenreader friendly hidden content
Fixes #14337: Round .jumbotron corners within .container and .container-fluid
Fixes #14329: Fixed list-groups nested inside of collapsing panels, from @apexskier
Undo the collapse visibility changes since it breaks our collapse plugin
Fixes #14439: Add static tooltip example to docs
Finish reverting #14444
grunt
Update QUnit to v1.15.0.
Merge pull request #14472 from mrduguo/master

fix nav links to end with / to avoid 301 redirect
mention #14320 in browser bugs
grunt