Interpret 'nodeProcessCommandLine' as a relative path if it starts with '.'

This patch i'm currently using to simplify deployment a little. I can now deploy a complete app (with private node.exe and web.config) by unzipping a zip file on our web server.

Is there interest to merge this (or something like it) into iisnode?

(a similar solution was proposed for https://github.com/tjanczuk/iisnode/issues/175, but nothing came of that)