Merge pull request #16004 from kkirsche/patch-2

[Fix #16001] Add link to Vietnamese translation

[Fix #16001] Add link to Vietnamese translation

[Fix #16001] Add link to Vietnamese translation

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Merge pull request #15988 from twbs/fix-15874

Hiding an uninitialized tooltip/popover no longer initializes it

Hiding an uninitialized tooltip/popover no longer initializes it; fixes #15874

add role="button" to a[data-toggle="collapse"]; fixes #15972

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rm semicolon for sake of fat's eccentric tastes

Erratum from #15496

Accessibility and headings hierarchy for the "CSS" page.

Closes #15948 by merging it.

Accessibility and headings hierarchy for the "Getting started" page.

Closes #15946 by merging it.

Javascript docs: Accessibility and cosmetic changes to headings.

Closes #15915 by merging it.

Merge pull request #15961 from kkirsche/ImplementAssertExpect

[Fixes #15953] Implement assert.expect in each unit test

[Fixes #15953] Implement assert.expect in each unit test

[Fixes #15953] Implement `assert.expect` in each unit test

Merge pull request #15984 from twbs/document-handleupdate

Properly document Modal#handleUpdate

Properly document Modal#handleUpdate

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Merge pull request #15881 from twbs/fix-modal-backdrop

Modal: Fix backdrop not readjusting when height changes

Modal: Fix backdrop not readjusting when height changes

Fixes #15136.
Closes #15345.
Closes #15314.
Refs #14724, #14927.

[Fixes #15976] Fix pagination link cut off border on hover

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Merge pull request #15974 from patrickhlauke/ios-click-fix-role-button2

Add upstream patch comment for #15947

Add upstream patch comment

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Merge pull request #15947 from patrickhlauke/ios-click-fix-role-button

iOS fix for role="button" elements; [fixes #15935]

Merge pull request #15970 from twbs/the-future-is-now-qunit

Disable deprecated QUnit global methods

Disable es3 for tests and customizer.js.

Run `grunt`.

Disable deprecated global QUnit method aliases to prevent backsliding on QUnit v2 readiness

Merge pull request #15955 from twbs/fixture-on-screen-ios

Unit tests: Only display fixture on-screen for iOS

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Merge pull request #15593 from neoeno/handle_multiple_zero_offset_scrollspy_elements

Handle multiple zero-offset Scrollspy elements.

Handle multiple zero-offset Scrollspy elements.

When the first two elements in a scrollspy content block have a document
offset of zero (i.e. they're hard against the top of the page),
Scrollspy would switch between them on every scroll event.

This could happen, for example, in a system of nested sections:

```
<section id="animals">
  <section id="dogs">
Content
  </section>
</section>
```

This ocurred because Scrollspy's check to see if it's at the end of the
array of sections uses `!arr[index]`. This misses the case where
`arr[index]` does exist and is zero.

This commit explicitly checks the array bounds.

Merge pull request #15965 from kkirsche/fixURL

[Docs / README] Fix URL to match the plugin keyword recommendation

Merge pull request #15964 from kkirsche/addAccidentlyRemovedText

[Docs] Replace accidently removed tooltip / popover text

Remove dupe docs CSS, move anchor styles to scss directory, recompile

fix validation, run grunt dist

Fix URL to match the keyword

Fix URL to match the keyword

Merge branch 'master' into v4

Conflicts:
.travis.yml
Gruntfile.js
bower.json
dist/css/bootstrap.css
dist/css/bootstrap.css.map
dist/css/bootstrap.min.css
dist/js/bootstrap.js
dist/js/bootstrap.min.js
docs/_data/glyphicons.yml
docs/_includes/components/breadcrumbs.html
docs/_includes/components/button-dropdowns.html
docs/_includes/components/button-groups.html
docs/_includes/components/dropdowns.html
docs/_includes/components/glyphicons.html
docs/_includes/components/labels.html
docs/_includes/components/list-group.html
docs/_includes/components/media.html
docs/_includes/components/navs.html
docs/_includes/components/panels.html
docs/_includes/components/progress-bars.html
docs/_includes/components/thumbnails.html
docs/_includes/components/wells.html
docs/_includes/css/buttons.html
docs/_includes/css/forms.html
docs/_includes/css/helpers.html
docs/_includes/css/images.html
docs/_includes/css/less.html
docs/_includes/customizer-variables.html
docs/_includes/getting-started/accessibility.html
docs/_includes/getting-started/browser-device-support.html
docs/_includes/getting-started/community.html
docs/_includes/getting-started/examples.html
docs/_includes/getting-started/grunt.html
docs/_includes/getting-started/license.html
docs/_includes/getting-started/template.html
docs/_includes/header.html
docs/_includes/js/affix.html
docs/_includes/js/alerts.html
docs/_includes/js/carousel.html
docs/_includes/js/collapse.html
docs/_includes/js/dropdowns.html
docs/_includes/js/modal.html
docs/_includes/js/overview.html
docs/_includes/js/popovers.html
docs/_includes/js/scrollspy.html
docs/_includes/js/tabs.html
docs/_includes/js/tooltips.html
docs/_includes/js/transitions.html
docs/_includes/nav/javascript.html
docs/_layouts/default.html
docs/assets/css/docs.min.css
docs/assets/css/src/docs.css
docs/assets/js/customize.min.js
docs/assets/js/docs.min.js
docs/assets/js/raw-files.min.js
docs/assets/js/vendor/FileSaver.js
docs/assets/js/vendor/autoprefixer.js
docs/assets/js/vendor/uglify.min.js
docs/dist/css/bootstrap.css
docs/dist/css/bootstrap.css.map
docs/dist/css/bootstrap.min.css
docs/dist/js/bootstrap.min.js
docs/examples/blog/index.html
docs/examples/carousel/index.html
docs/examples/cover/index.html
docs/examples/dashboard/index.html
docs/examples/narrow-jumbotron/narrow-jumbotron.css
docs/examples/navbar-fixed-top/index.html
docs/examples/navbar-static-top/index.html
docs/examples/non-responsive/index.html
docs/examples/non-responsive/non-responsive.css
docs/examples/theme/index.html
grunt/configBridge.json
js/affix.js
js/carousel.js
js/collapse.js
js/dropdown.js
js/modal.js
js/popover.js
js/scrollspy.js
js/tab.js
js/tests/unit/affix.js
js/tests/unit/button.js
js/tests/unit/carousel.js
js/tests/unit/modal.js
js/tests/unit/tooltip.js
js/tooltip.js
less/badges.less
less/glyphicons.less
less/type.less
less/variables.less
package.json
scss/_dropdown.scss
scss/_forms.scss
test-infra/npm-shrinkwrap.json

Replace accidently removed text

X-Ref #15742

cc: @mdo

Input group sizes: Properly position `.form-control-feedback`

Ref https://github.com/twbs/bootstrap/issues/12868#issuecomment-76291513
Ref 7733f24

Unit tests: Only display fixture on-screen for iOS

Since only on iOS tests fail when the fixture is displayed off-screen, see https://travis-ci.org/twbs/bootstrap/jobs/52605742

Merge pull request #15954 from twbs/sauce-hidepassed

Use different way to make failing test more visible in Sauce

Use different way to make failing test more visible in Sauce

Merge pull request #15929 from kkirsche/patch-5

[Fixes #15928] Encourage use of icons with form validation states for co...

[Fixes #15928] Encourage use of icons with form validation states for colorblind users

[Fixes #15928] Encourage use of icons with form validation states for colorblind users

Update text per @patrickhlauke's feedback

Update text per @patrickhlauke's feedback.

Fix stupid grammar mistake

iOS fix for role="button" elements; [fixes #15935]

Fixes "clickability" issue (and more generally, the firing of events
such as focus as well) for traditionally non-focusable elements with
role="button" (see
https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile)

Fixes #15935

[Fixes #15944] Add Z-Index to avoid border overlapping

[Fixes #15944] Add Z-Index to avoid border overlapping

Merge pull request #96 from twbs/gem-badge

Add Ruby Gem badge to README

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Merge pull request #15826 from kkirsche/patch-19

[Fixes #15825] .initialism class should use mixin

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Merge pull request #15941 from twbs/ijcheung-collapse-update-all-triggers

Update all collapse triggers with .collapsed class and aria-expanded

Update all collapse triggers with .collapsed class and aria-expanded

Fixes #15741
Closes #15751 by merging it.

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Run `grunt`.

Merge pull request #15933 from twbs/qunit-module-hooks

Unit tests: Use new names of module hooks

QUnit.jsDump => QUnit.dump

Refs http://qunitjs.com/upgrade-guide-2.x/#replace-qunit-jsdump-with-qunit-dump

Use QUnit.log(...) instead of QUnit.log = ...

Refs http://qunitjs.com/upgrade-guide-2.x/#replace-qunit-log-callback-with-qunit-log-callback-for-all-reporting-callbacks

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Unit tests: Use new names of module hooks

Refs #15893

Merge pull request #15930 from twbs/modal-restore-inline-padding

Modal: Apply any preexisting body padding again after closing

Modal: Apply any preexisting body padding again after closing

Prevent collapsed navbar in Non-responsive Example

Closes #15291 by merging it.

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Tooltip: Avoid creating an unnecessary tooltip when `Tooltip#hide` is called

Fixed performance bug where a tooltip element is created and then immediately destroyed when tooltip.hide() is called and there is no existing tooltip element

Resolves #15557 by merging it.

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Dropdowns: Skip `.disabled` instead of `.divider` on keydown event

Fixes #15147.
Closes #15520 by merging it.

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Merge pull request #15923 from kkirsche/useExplicitVariableDeclaration

[Ref #15881] Use Explicit JS Variable Declarations rather than Chained

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Merge pull request #15693 from huang-x-h/patch-1

tip method in popover.js can be removed

[Ref #15881] Use Explicit Values rather than Chain

[Ref #15881] Use Explicit Values for javascript variables rather than chained ones.

From https://github.com/twbs/bootstrap/pull/15881#discussion_r25330647

fix 2 typos in modal unit test assertion messages

Merge pull request #15916 from kkirsche/patch-2

Add source code documentation of justified navbar for #15906

Merge pull request #15914 from StevenBlack/docs.js.headings

docs > js > headings

Document justified navbar for #15906

Document in the source code that the justified nav is meant for single line list items only. This should help prevent Issues like #15906 in the future.

Follow-up to 769c27a19f: Add new section to nav

Document how to properly handle modals with dynamic content height

Fixes #15106.
Closes #15910.

Dropdown unit tests: Tiny style changes

Accessibility changes to headings (transitions.html)

Accessibility changes to headings (overview.html)

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Merge pull request #15913 from twbs/scrollspy-consistency

ScrollSpy: Small style consistency adjustments

Merge branch 'master' of github.com:twbs/bootstrap

Fix #15911: Clear the floats and move the padding to the header

ScrollSpy: Small style consistency adjustments

Merge pull request #98 from twbs/sync-package

Sync package.json with v3

Merge pull request #15900 from kkirsche/patch-5

[Docs—Fixes #15882]Use an ID as the example for Scrollspy

Merge pull request #15903 from michael-k/patch-1

Updated license links

Merge pull request #15887 from StevenBlack/headings-labels

docs>components>labels headings

Merge pull request #15889 from StevenBlack/headings-progressbars

docs>components>progress bars headings

Merge pull request #15828 from kkirsche/patch-20

Add plugin package keyword recommendation

Merge pull request #15891 from StevenBlack/headings-listgroup-panel-well

docs>components>(remaining components) headings

Merge pull request #15890 from StevenBlack/headings-media

docs>components>media object headings

Merge pull request #15888 from StevenBlack/headings-thumbnails

docs>components>thumbnails headings

Merge pull request #15886 from StevenBlack/headings-buttondropdowns

docs>components>button-dropdowns headings

Merge pull request #15885 from StevenBlack/headings-buttongroups

docs>components>button-groups headings

Merge pull request #15884 from StevenBlack/headings-dropdowns

docs>components>dropdowns.html headings

Merge pull request #15908 from kkirsche/bumpMarkdownIt

Bump markdown-it to ^3.0.7

Sync package.json with a1fd86cdf9dca0f0d11ae895a92debe6a05b1163