min-content is standard, so no need to vendor prefix it

Also, makes little sense to say that Firefox sets a `-webkit`-prefixed value
bump load-grunt-tasks to ~0.5.0

[skip validator] [skip sauce]
Merge pull request #13820 from twbs/bump-load-tasks

bump load-grunt-tasks to ~0.5.0
README.md: Refactoring bages.
Merge pull request #13827 from vsn4ik/refactoring_by_vsn4ik

Refactoring bages in README.md.
Update dependencies.

Conflicts:
	test-infra/npm-shrinkwrap.canonical.json
Update grunt-csscomb.
Run `grunt`.