Fixes validate html to allow using multiple h1 tags
Integrate grunt-scss-lint
Add gem install scss-lint in .travis.yml
Update scss-lint rule
Fixes warning by scss-lint
Update grunt-csscomb.
Update dependencies.
Update dependencies.
Update dependencies and Jekyll version.
Remove `layout: nil`.

It throws a warning with the latest Jekyll.
Improve the rule of scsslint
Fixes missed parenthesis close
Fixes double-quoted strings
Build dist
Update StringQuotes check
Replace a single quote with double quote
Update scsslint rule for some old IE versions
Fixes keep the spaces for old IE
Update scss lint rule to remove unused line
Rebuild for fixing space