Stat object on file buffer doesn't appear to work anymore

Really handy tool. Thanks for building it.

I'm getting failures with node *v0.10.20*. There doesn't appear to be a *stat* object attached to the file [buffer]( http://nodejs.org/api/buffer.html) on line 50. I'm guessing it was dropped in a more recent version of node???

Anyway... hope this is a sane fix.

Thanks
Jamie