Merge pull request #26 from omasanori/master

Follow CR-html5-20140429.
Follow WD-css-gcpm-3-20140513

See also: http://www.w3.org/TR/2014/WD-css-gcpm-3-20140513/

NOTE: Some functions are not highlighted correctly.
Follow WD-css-masking-1-20140522

See also: http://www.w3.org/TR/2014/WD-css-masking-1-20140522/
Support css3-conditional properly
Drop css3-mediaqueries support
Wrap texts on 80th column