Example file (example.py) uses process instead of thread

[pengnam]

(https://github.com/dpkp/kafka-python/blob/master/example.py)

Consumer is a subclass of multiprocessing.Process.

The print statement in the run function will never print to the terminal as processes shares a different memory space.

[dpkp]

PRs welcome!

[jeffwidman]

nudge @pengnam you interested in submitting a PR? Should be a simple change...