Replace some images on the Carousel example with some base64 encoded 1x1 gifs
Merge pull request #12204 from twbs/fix-8869

replace .visible-{size} with .visible-{size}-{display}
Break mixins.less up into smaller modules.

Move all deprecated vendor prefix mixins to less/mixins/vendor-prefixes.less
Create mixins directory and move partials to that directory.

FIXES #12994
proper var
Merge branch 'master' into modular-the-mixins

* master:
  Replace some images on the Carousel example with some base64 encoded 1x1 gifs
  ugh grunt
  moar grunt
  mo copy
  http://www.youtube.com/watch?v=AJWtLf4-WWs
  grunt
  Copy change
  fix grammar in comment in forms.less
  Fixes #12759
  Fixes #12738
  replace .visible-{size} with .visible-{size}-{display} ; fixes #8869

Conflicts:
	dist/css/bootstrap-theme.css.map
	dist/css/bootstrap.css.map
	docs/assets/js/customize.min.js
	docs/assets/js/raw-files.min.js
	docs/dist/css/bootstrap-theme.css.map
	docs/dist/css/bootstrap.css.map
	less/mixins.less
Add consistent newline at end of files in less/mixins
Add recompiled assets after nuking toc in mixins.less.
Use `outline: 0` consistently
Merge pull request #12999 from ZDroid/outline-zero

Use `outline: 0` consistently
Merge branch 'master' of github.com:twbs/bootstrap
grunt
Formatting, comment consolidation, and line endings
fix #12771
Merge branch 'master' into modular-the-mixins

Conflicts:
	dist/css/bootstrap.css.map
	docs/assets/js/raw-files.min.js
	docs/dist/css/bootstrap.css.map
words
Correct the page name

"Getting started" is used in the docs.
Add missing customizer comment
Merge pull request #13002 from ZDroid/hash

Add missing customizer comment
Bump Jekyll version used in Travis to v1.4.2.

Note that while v1.4.3 is the latest stable version, it has a nasty Windows bug.
(https://github.com/jekyll/jekyll/issues/1948)
Merge branch 'master' into modular-the-mixins