Added a new njs.cmd script.  This script will assist windows users since...

Added a new njs.cmd script.  This script will assist windows users since 
shebangs are not honored.  The script will take arg[1] and prepend it with 
the objects location in the path, then prepend that with node.exe

Usage: njs SomeNodeJSbin.js
  This will find SomeNodeJSbin.js in your path and run it under node.

Errata: Don't think it works in "." or in quoted paths, but a good starting point.