Remove bootstrap keyword
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.
Add autoprefixer