SHA-based subclass for random module

[Josiah Carlson]

Paul,

I've been wanting to email you for a couple days, but I've been having 
difficulty in finding your email address online anywhere, or even 
derived from the "Sender" header (though I didn't try too hard other 
than to strip out the -nospam portion).  If you would email me directly, 
I'll reply with what I've been wanting to say.

Thanks,
  - Josiah