Add nested kbd element styles for actual keys or inputs
add button to toggle the optional theme when viewing the docs; fixes #9764
regenerate minified docs JS & CSS
Fixes #13478, reverts #10941
Merge branch 'master' into icon_paths

Conflicts:
	dist/css/bootstrap-rtl.css
	dist/css/bootstrap.css.map
	dist/js/bootstrap.min.js
	docs/dist/css/bootstrap.css.map
	docs/dist/js/bootstrap.min.js
Merge branch 'master' into icon_paths

Conflicts:
	dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.css.map
Customizer: Alert on successful save to Gist
Adjust for Scrollspy offset when calculating maxScroll.
Add Scrollspy maxScroll with offset test.
Add tooltip self-reference to address #12320

primarily adds a data- attribute to the tooltip (and thus, the popover)
to create a self-reference.
Adds aria described by to tooltip plugin for accessibility

Generates a unique id for tooltip and adds [aria-describedby] to the element
it is called on. Resolves issue #13480

- set up test
- linted the code styles
- passed the tests
- integrated feedback from @cvrebert
Update showSuccess to use new classes
Hopefully a fix for #12364

* register the callback before invoking the toggling
* listen for `hidden` instead of `hide`
* account for the possibility of the associated `show` event being preventDefault-ed

Adds relevant unit tests.
Merge branch 'master' into icon_paths
Merge branch 'master' into docs-theme-toggler

Conflicts:
	docs/assets/css/docs.min.css
Applied translate3d to modal, navbar-fixed and affix to combat browser repaint
update explanatory comment about iOS date/time inputs bug

Per:
* http://jsbin.com/purer/2/edit
* https://github.com/cvrebert/bs-css-hacks/blob/6e8aa78384a005b007fc45327c9516dcf6ec0f30/README.md#ios-temporal-input-line-height
Thanks @mdo <3

[skip sauce] [skip validator]
show proper error message when viewing Customizer in IE8

Closes #13090.
[skip sauce]
grunt dist
Revert 4f9270cc20c29cd3fbb0664379d620d14bb24a91.

The validator doesn't choke anymore on this and even though it's not spec compliant, it's needed for some IE versions. So until we move favicon.ico in root, this should do the job.