Feature/split exhibitor

This is the super simple new zookeeper cookbook with exhibitor removed. This, along with wolf31o2/chef-exhibitor#1 will resolve SimpleFinance/chef-zookeeper#75 and allow for me to fix mdsol/mesos_cookbook#33 by changing its dependencies to: recommends exhibitor

This should make it easier for me to allow mesos to use my `hadoop::zookeeper` and `hadoop::zookeeper_server` recipes