code.less: also set default monospace font for `<kbd>` and `<samp>`
Fix #10324: Add opt-in note to tooltip docs

* Re-added a note (now callout) about need to opt in to tooltip docs
* Converted same note in popover section to callout
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);
Add Welcome section to docs

* Fixes unrelated typo in readme
* Add new Welcome section with history, team, callouts, and community
subsections
* Redesigns callouts to be a bit lighterweight with colored headings
shorter avatar urls
use irc link
Merge branch 'master' into docs_welcome
adding required attribute for example signin form
Copy edits from @cvrebert and @juthilo
dat @juthilo edit
dat hash
fixes #9985: update grid classes in grid example
Remove display: block from address

<address> is already displayed as block in all browsers (UAs).
Rephrase text
Updated the old btn-large in carousel example
Merge pull request #10563 from lipis/patch-1

Updated the old btn-large in carousel example
run grunt dist
rm period from licensing header so it's not mistaken as part of the URL
fix punctuation in author field of package.json
generate CSS banners via Gruntfile; fixes #10101