generators : random shootout

[Mark McEahern]

Oops, after tweaking the timing a bit, they seem to take the same amount of
time:

    # using globals
    $ gen.py 1000
    8.163294467
    0.010000 seconds.

    # using generators
    $ gen2.py 1000
    8.163294467
    0.010000 seconds.

// mark