Cleanup usage of & add notes about docs.min.js in examples

And add explanatory comments to the Carousel & Dashboard examples regarding holder.js

[skip sauce]

The revert was incomplete.

Specify the files to include in the npm package.

Include dist/ files in language stats on GitHub

GitHub considers Bootstrap files to be vendored files, and excludes them from
repository language statistics. This makes sense for most repositories, where
Bootstrap is indeed third-party code. This repository is the exception; it's
first-party code here, so should count toward the language statistics.

Closes #15754
[skip sauce]

Fix link to French translation

Bump grunt-html to ~3.0.0

v0.12.0-v0.12.1 breaks paths in URL.

Bump devDependencies.

Fixes #15653 — Add comment which explains that how a responsive im...

Fixes #15653 — Add comment which explains that how a responsive image should be centered

Redo of #15657 which I couldn't get to rebase properly after all the merges were done last night.

[Fix Issue #15682] .caret is smaller in Firefox than other browsers

Improve image layout in the carousel example.

[Fix Issue #15719] Add a variable for .form-group's margin-bottom

Update Twitter handle: @twbootstrap => @getbootstrap

Refs https://github.com/twbs/bootstrap-blog/commit/1c94b7791f8a24a18f08aba40c38d519b873f2d0
CC: @mdo

Skip link workarounds for Chrome and IE

[Fix Issue #15701] [Docs] Tooltip/popover destroy docs and delegation

[Fix Issue #15701] Tooltip/popover destroy docs don't explain the delegation case.

Add to popovers

Clarify target of carousel events

Clarify target of modal events