Some tests included for making sure the JSON blob pulled from Zookeeper
is correct.
Updated client to be able to take Zookeeper json cluster config that is
currently being used in aurora (clusters.json usually located at
/etc/aurora/cluster.json).
Changed error messages to no longer have a period at the end as that was
throwing off printing of the error.
Modified samuel's ZK library slightly to stop verbose logging using a
NoOpLogger from stackoverflow.
