Windows inkscape support

[richfitz]

I have no idea how to access inkscape from the command line on Windows, not having access to a windows machine. This is likely to be easy to fix.

Other potential issues include possibly having to give full paths:

• http://www.inkscapeforum.com/viewtopic.php?f=5&t=4191
• https://bugs.launchpad.net/inkscape/+bug/504713

[richfitz]

Possible default windows path: https://gist.github.com/berteh/5416973

[richfitz]

Can test this on Ubuntu with Job now.