Added centos-6.4 data to .kitchen.yml and update Cheffile to point to re...

This cookbook, without any changes, works on Centos 6.4. KitchenCI ran Chef for both Kafka 0.7 and 0.8 with no errors and 3 tests passed. Only changes to the repo are .kitchen.yml additions for centos-6.4 and a reference in Cheffile to as-yet-unmerged redhat branch of zookeeperd.