Don't explicitly reference global jQuery

Removes `window.jQuery` in favor of `jQuery`, fixes #10038
remove unused `{{ page.base_url }}` variables, and fix the urls
Combine multiple .thumbnail > img styles
more grunt
3.0.1
Added navigation role to example navbars

As per the docs:
http://getbootstrap.com/components/#navbar-default

  modified:   examples/carousel/index.html
  modified:   examples/jumbotron/index.html
  modified:   examples/navbar-fixed-top/index.html
  modified:   examples/navbar-static-top/index.html
  modified:   examples/navbar/index.html
  modified:   examples/non-responsive/index.html
  modified:   examples/starter-template/index.html
  modified:   examples/sticky-footer-navbar/index.html
  modified:   examples/theme/index.html
Update README.md

Row 13 link update to tag v3.0.1
Use nesting for thumbnail styles
Update customizer.js
update version numbers in JS file comment headers to v3.0.1 & regrunt
& > == >
don't use nonstandard window.location.origin in customizer JS; fixes #11317
Use nesting for .placeholder()
Fix #7398 in Basic template

See https://github.com/twbs/bootstrap/issues/7398#issuecomment-27617890 for details.
Thanks @martinburger
Removed duplicated class change from migration instructions
Add toogle nav for screen readers in examples
Fixed links

Links to same-page anchors were treated as external links.
update node.js to v0.10.x (current stable)
add Grunt task to change version numbers; fixes #11332
fix 1 remaining instance of #11349