SHA-based subclass for random module

[Josiah Carlson]

> Wait, there is only a finite amount of porn in the world. I know, why not just 
> use the latests comments posted on Slashdot? That is an *inexhaustable* supply 
> of rubbish. Nobody would sift through all that, not ever for a MILLION dollars.

I have a feeling that the rubbish comments on slashdot aren'y very 
random.  Perhaps a pass through an entropy coder would be sufficient to 
make the perterbations good enough.

  - Josiah