upgrade to grunt-html-validation v0.1.11
enable failHard grunt-html-validation option; fixes #11876
Downgrade Safari and OS X
Merge pull request #11916 from ZDroid/fix-iversions

Downgrade Safari and OS X
Add docs-assets/css/docs.css to csslint too.
temp
js/.jscs.json: sort by name.
Normalize package.json.
bower.json: sort by name.