Generated SVG is missing xmlns and xmlns:xlink attributes.

[mbostock]

I noticed this while trying to crowbar the following SVGs:

http://bl.ocks.org/mbostock/raw/3795544/

The resulting SVG files svg elements appeared as:

<svg width="320" height="500" version="1.1">

However, the desired result includes xmlns and xmlns:xlink attributes:

<svg width="320" height="500" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">

Without these attributes, the SVG will not display properly.

[shancarter]

Thanks, should be fixed now