Network metadata/metrics compatible with older server versions Fixes #128

This probably needs some refactoring, but it sets the iface for windows network metrics and is compatible with older versions of windows server

This is currently running on ny-web01 pointing to dev bosun. See os.net.bytes at http://goo.gl/80uLzZ

I'll move it into a global ignore file (on my local) and delete the .gitignore from the repo