Scrollspy acting up when targets are hidden

If elements are hidden using `display: none;` which are targets mapped by scrollspy, the plugin might select an incorrect or no menu item.

Checking if the target is visible solved this.
Add quick fix to labels and badges in buttons
Add well-border variable

Add a variable to allow the well border color to be specified.

The reason I'd like to see this included is that my companies styleguide
requires an explicit border color on well-like constructs. This variable
allows me to easily override the default to use that color.
Support .h1 in place of h1 inside .jumbotron

As in #7284, it can often be useful to style text like a heading in
places where using the heading tag would be either semantically
incorrect, less accessible, or otherwise invalid.

Support this in .jumbotron as in the rest of the document by allowing
elements with class .h1 to stand in for the h1 element.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
otherwise content scrolls on chrome

without change, body scrolls on chrome Version 30.0.1599.101 (OSX 10.9)
Serve jQuery from cookie-free Google APIs

jQuery.com uses Google Analytics and so sets a cookie when you visit
the site. When you request jquery.js from its CDN, code.jquery.com,
you take a hit from sending your previous GA cookie in the request.

Google Hosted Libraries[1] and googleapis.com never set cookies.

[1] https://developers.google.com/speed/libraries/devguide
Load Twitter widget async, prevent SPOF

Twitter's widget library[1] provides an async snippet to inject the
script tag later. Since widgets.js came before the local JS, if
twitter.com took long to respond it would prevent subsequent
synchronous script tags.

[1] https://dev.twitter.com/docs/tfw-javascript
Add protocol for jQuery to work when accessed as file

URLs without protocols get "file:" prepended when their document is
loaded as a file. Make sure the docs can always be opened by
specifying a protocol.
Add async attribute to Twitter widget script
docs derp
Merge branch 'master' into docs_derp

Conflicts:
	dist/css/bootstrap.min.css
Simplify table state styles
Update affix properly on scrollspy speedy scroll to top of page #11310

Fix scrollspy.js so as affix is updated properly when user scrolls fast
to top of page.

A fix for issue #11310.
Don't print .clearfix() comment references
Fix glyphicon class name wrapping in IE
Add missing `.small` styles and docs
Carousel: Use the transition duration from CSS

This makes it possible to change the transition duration in CSS
Corrected color contrast to WCAG 2.0 AA
Better documentation for validation states
Fix #11400 and #11431