Partial textPath support for librsvg

[Mika Heiskanen <mika heiskanen fmi fi>]

Hello,

I added some support for the SVG textPath element to librsvg:

  http://beta.fmi.fi/librsvg/

I'll make an official patch later on as advised in

  https://wiki.gnome.org/GnomeLove/SubmittingPatches

Any feedback on the implementation would be welcome before
I send the patch.

Regards,

Mika Heiskanen / Finnish Meteorological Institute