Don't explicitly reference global jQuery

Removes `window.jQuery` in favor of `jQuery`, fixes #10038
Bower: Ignore development and documentation files on bower.json. Fix #10313.

I've kept only the files I consider relevant to bower installation:

- Files in dist directory;
- Files in js directory;
- Files in less directory;
- bower.json file;
- README.md file;
- LICENSE file.
bower.json: Modify `assets` directory on ignore to `docs-assets`
added bower_components to .gitignore
Use nesting for thumbnail styles
don't use nonstandard window.location.origin in customizer JS; fixes #11317
Use nesting for .placeholder()
Merge pull request #11338 from ZDroid/nestform

Use nesting for .placeholder()
Fix #7398 in Basic template

See https://github.com/twbs/bootstrap/issues/7398#issuecomment-27617890 for details.
Thanks @martinburger
Merge pull request #11336 from twbs/fix-11317

don't use nonstandard window.location.origin in customizer JS
Removed duplicated class change from migration instructions
Merge pull request #11345 from pborreli/patch-3

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.
Merge pull request #11354 from Ore4444/patch-1

Fixed links
update node.js to v0.10.x (current stable)
add Grunt task to change version numbers; fixes #11332
Merge pull request #11335 from twbs/version-number-updater

add Grunt task to change version numbers
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