Fixes #12748
G R U N T G R U N T
Merge branch 'master' into typography-example-updates

Conflicts:
	docs/assets/js/customize.min.js
Merge pull request #12957 from BBosman/rename-mixin

Fix transition-timing-function mixin
Merge pull request #12891 from ZDroid/bower-json-paths

Remove ./ from bower.json paths
Merge branch 'master' into document_popover_focus

Conflicts:
	docs/assets/js/docs.min.js
fix derped html
Merge pull request #12688 from twbs/document_popover_focus

Document popover focus
Add transition-timing-function mixin to docs
Fix typo.
Do csscomb earlier in build phase
Reorganize docs assets
Merge pull request #12961 from BBosman/csscomb

Do csscomb earlier in build phase
Merge pull request #12505 from ZDroid/js-cs-hint

Reorganize docs assets
Move license to the top of the file.
Improve badges mixinability
rm #1969 from browser bugs list per outcome of investigation
Remove ./ from package.json paths
Remove ./ from _config.yml paths
Merge pull request #12971 from ZDroid/config-yml

Remove ./ from _config.yml paths