Add 3D transforms properties

Добавлено несколько функций для 3D трансформаций, описанных
в спецификации http://www.w3.org/TR/css3-transforms/#transform-functions
Merge pull request #259 from lancedikson/master

Add 3D transforms properties
Change default value in trf:sc3 abbreviation
Merge pull request #266 from zolotov/quickfix

Change default value in trf:sc3 abbreviation
Merge branch 'master' of https://github.com/emmetio/emmet
Flex model support added
Merge branch 'master' of https://github.com/sergey-rybalkin/emmet