Windows doesn't kill processes spawned by the script when script gets killed.

After this change you can use supervisor on Win32 to run cofferscript files like that:

supervisor -x coffee.cmd index.coffee
 
The point of the change is to kill child process spawned by the coffee.cmd when there's need to restart the server. Windows (unlike linux?) doesn't seem to kill it automatically when coffee.cmd itself is killed.

Some discussion regarding the issue:
https://github.com/isaacs/node-supervisor/issues/83#issuecomment-40898374