Support Inkscape namespace attributes

[danielesegato]

Inkscape use a custom namespace in its SVG:

xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"

And there are 2 attributes in it that I think can be easily mapped to Android vector:

inkscape:transform-center-x
inkscape:transform-center-y

they can become pivotX / pivotY

I don't know if there are any other Inkscape specific attributes that can be converted into Android Vector drawables.

In theory this link should document all the differences between standard SVG and Inkscape SVG:
http://wiki.inkscape.org/wiki/index.php/Inkscape_SVG_vs._plain_SVG

In practice those two attributes are not listed there.