changed attr('data-target') to data('target');

this will extend js interface, to be possible to setup targets for tabs as 
    var content=$('<div class="tab-pane">',{text: 'content'});
    var tab=('<li>',{html: $('<a>',{text: 'Main options'})}).addClass('active').data({target: $main,toggle: 'tab'}).appendTo(tabs);
adding required attribute for example signin form
move to separate about page
Use bootstrap.less file order in Customizer

Appending stylesheets by iterating the `__less` Hash creates an order
that is not the same as 'bootstrap.less'.

Some stylesheets like 'component-animations.less' and 'modals.less' have
selectors with matching specificity, and so file order decides which
style wins. This causes issue #10030 by putting `.fade.in` after
`.modal-backdrop.in` and gives the backdrop a higher opacity than
intended.

This change uses the Less ordering in 'bootstrap.less' to generate the
final stylesheets in the Customizer to make sure customized file
ordering matches the distribution file order.

Fixes #10030
Change border to border-radius

Border isn't set, but border-radius is.
Jumbotron: remove the hard-coded font-size from jumbotron.less and moved it into variables.less where other .font-size-xxxxx things now live.
Insert comma to fix validation warning

BS doesn't support IE6/IE7, so comma can be inserted.
The Jumbotron font-size LESS variable now conforms to the '@{bootstrapClass}-font-size' naming scheme.
The customizer now displays and collects the new Jumbotron font-size LESS variable
Good catch by @juthilo - omitted the modified  in a prior commit.
use CDN for html5shiv instead of vendoring it; fixes part of #10989
use CDN for jQuery instead of vendoring it; fixes part of #10989
Merge pull request #11013 from twbs/fix-10989

Use CDNs for more example JavaScripts
address #10965; mention Glyphicons-over-file:// problem in Carousel example
use https:// for CDN links

- works when viewing page via file://
- sets a good example security-wise
fix typo in Getting Started docs prose
Merge pull request #11018 from twbs/use-https

use https:// for CDN links
Nicer docs license name

DOCUMENTATION-LICENSE is so long.
documentation that multiple modals are not supported
Merge pull request #11049 from alexdahl/multiple-modals-doc

documentation that multiple modals are not supported