Builder

Hi,
  I have been using this module sucessfully on my linux box, but it would not install on windows due to the shell script used.
So, I have done a nodejs equivalent so it no longer relies on wget etc...
This works on my windows machine and the only external dependency is that node is on the path, which is pretty likely !!

I have used the download npm module for downloading, but unfortunately, its decompression stuff did not work - it failed on some files in the zip file for some reason, so I have also used decompress-zip which seems to do the job.

Hopefully you can incorporate this into the main module then I can remove my fork.  If you want any further changes to it, please let me know

Cheers

Gary