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
fix #13386
README.md: Refactoring bages.
Always use preserveComment: 'some'
Merge pull request #13827 from vsn4ik/refactoring_by_vsn4ik

Refactoring bages in README.md.
Make autoprefixer browsers fixed

Closes #13795 by merging it.
popovers.html: fix typo: "Dimissmisable"
Fix dismissible spelling
Merge pull request #13845 from BBosman/dismissible

Fix dismissible spelling
fix for #13747

Closes #13782 by merging it.
Merge branch 'erwanjegouzo-master'
grunt dist
Update dependencies.
Gruntfile: add note about duplicate copy of jqueryCheck code

Refs #13842
Merge branch 'deps'
address #13811
Travis: per today's PyPI issues, travis_retry the pip install step

Also, remove deprecated --use-mirrors option
sigh