Update README.md

Remove old reference to gevent_zookeeper since the Producer currently expects a Kazoo client.
Avoid NodeExists errors in zk log
Handle None data from kazoo
Merge pull request #7 from edgeware/node-exists-23194

Avoid NodeExists errors in ZooKeeper log
Merge pull request #8 from edgeware/none-data-errors-23158

Handle None data from kazoo
Move dependencies from requirements.txt to setup.py
Add support for running tests from setup.py.
Add missing __init__.py file.
Add Makefile for running tests and pep8/frosted.
Make sure PEP8 and Frosted passes.
Re-add Johan Rydberg as author.

Since this is a public project under Apache License 2.0 I believe we
need some sort of consent.
Skip tests if `$ZOOKEEPER_PATH` is absent.
Bump Gevent to v1.0 and Kazoo to v1.3.1.
Merge branch 'put-dependencies-in-setup' of github.com:edgeware/gevent-kafka into put-dependencies-in-setup

Conflicts:
	README.md