Allow jshint to work on Windows

runner command was incorrect for Windows environment
Yes, it kind of does.  But doesn't jshint require node be installed as a command?  On Windows 7, leaving the runner call as it was (and changing the slash to backslash) caused it to attempt to run in Windows' js interpreter.

As for combining the command and letting the slash fixer-upper fix the lines (which is what I think you meant), I thought about that. s:plugin_path could be removed entirely but since it was there, I wanted to preserve the logic.

Let me know how you want me to proceed and I can resubmit.