Follow WD-css-ruby-1-20140805
Follow WD-css-counter-styles-3-20140826

See also: http://www.w3.org/TR/2014/WD-css-counter-styles-3-20140826/
Remove obsolete workaround
Follow WD-css-display-3-20140911

See also: http://www.w3.org/TR/2014/WD-css-display-3-20140911/
Follow WD-css-line-grid-1-20140916

See also: http://www.w3.org/TR/2014/WD-css-line-grid-1-20140916/
Follow WD-css-flexbox-1-20140925

See also: http://www.w3.org/TR/2014/WD-css-flexbox-1-20140925/
Merge branch 'master' into omasanori