Don't explicitly reference global jQuery

Removes `window.jQuery` in favor of `jQuery`, fixes #10038
Use nesting for thumbnail styles
Add toogle nav for screen readers in examples
Merge pull request #11327 from ZDroid/nestnail

Use nesting for thumbnail styles
Merge pull request #11349 from alefteris/examples-navbar-sr-only

Add toogle nav for screen readers in examples
fix 1 remaining instance of #11349
Merge pull request #10039 from daguej/js-refs

Don't explicitly reference global jQuery
re-grunt