Fix Path when rendering path with multiple closed path.

I tried to render a path made with Inkscape which was the union of many different path and I noticed that not everything was working as intended.

So I put up this small correction to handle the case when dealing with a relative move to after a closed path.

I put a couple of visual tests inside your tests to check a simple case and the one I was trying to render ( a Sopwith Camel ).

I think it works fine even if I'm not much fluent in javascript, so maybe it is written in some untoward manner.