#3 Set SVG Canvas size

[Ross Gardler]

When generating SVG the canvas size should be set in
the root element of the SVG document, otherwise some
rendering engines will crop the image (this behaviour
is exhibited by the Cocoon transformer in the
whiteboard/xml package).

This patch simply sets the canvas size to the same size
as the rendered image.

[Ross Gardler]

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Ooops, forgot to attach patch, here it is.

[Ross Gardler]

Set SVG canvas size to image size