add button to toggle the optional theme when viewing the docs; fixes #9764
regenerate minified docs JS & CSS
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
Merge branch 'master' into docs-theme-toggler

Conflicts:
	docs/assets/css/docs.min.css
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.
move it to the sidebar
Reset the padding on radio/checkbox labels in form-inline
Merge branch 'master' into docs-theme-toggler

Conflicts:
	dist/css/bootstrap.css.map
	dist/css/bootstrap.min.css
	docs/assets/css/docs.min.css
	docs/dist/css/bootstrap.css.map
	docs/dist/css/bootstrap.min.css
Merge pull request #13463 from twbs/docs-theme-toggler

add button to toggle the optional theme when viewing the docs
clarify and danger-ify affix docs usage requirements, per #10235
Merge branch 'master' of github.com:twbs/bootstrap
tighten up callouts and remove backgrounds
more callout tweaks
don't change code bg on callouts