Quickcheck

hei, i wrote another example that demonstrates a few things:

 1. how quickcheck can be integrated with web-driver;
 2. how to test javascript functions;
 3. how sessions can be recycled for many runWD calls (probably obvious, but took me a moment to figure out).

I would be happy to find this upstream for reference and for others; if you want me to change anything before you can pull please let me know.

thanks,
matthias