Rename 'd' property

Hi all,

https://www.w3.org/2016/02/03-svg-irc.html#T23-25-17 is talking about the
'd' CSS property as a reflection of the 'd' attribute.

Though that name is really inexpressive. So I wonder, whether it could be
renamed to something more meaningful like 'path' when porting it to CSS (or
at least introduce it as an alias for 'd').

Sebastian