update GitHub issue link in comment
Run grunt dist.
grunt build-customizer-html
update boto & s3_cache.py
Remove bootstrap keyword
Added the very useful .animation-fill-mode() mixin

I think that's the only animation property that was missing and it's quite useful.

https://developer.mozilla.org/en-US/docs/Web/CSS/animation-fill-mode
Merge pull request #12829 from ZDroid/no-bs-keyword

Remove bootstrap keyword from package.json
Update load-grunt-tasks.
Bump grunt-jscs-checker.
Run `grunt update-shrinkwrap`.
Add docs.css in the CSSComb task.
Run csscomb before cssmin.
Merge pull request #12861 from twbs/docs-csscomb

Add docs.css in the CSSComb task.
Break csslint targets.
Fix csslint errors.
Move csslint overrides in Gruntfile.js.

This works around https://github.com/gruntjs/grunt-contrib-csslint/issues/26
Add sitemap.xml and robots.txt files.
Fixes #12851: it's not a tumah
Merge pull request #12866 from twbs/sitemap

Add sitemap.xml and robots.txt files.
Merge pull request #12855 from lipis/patch-1

Added the very useful .animation-fill-mode() mixin