[css-transforms] feedback

The spec needs to be modified to make doing SVG 3d transforms using the
SVGTransform object easier.

something along the lines of these functions need to be added :
SVGTransform.prototype.setRotateX(angle, x,y,z)
SVGTransform.prototype.setRotateY(angle, x,y,z)
SVGTransform.prototype.setRotate3d(anglex,angley,anglez,x,y,z)
SVGTransform.prototype.setTranslate3d(x,y,z)

Currently the specs make it so that in order to do 3d transforms through
javascript one must use setMatrix with an insane number of parameters all
calculated by the javascript code itself.