Merge pull request #24 from bbg-cookbooks/slaveof

[slaveof] add support for slaveof
[replication] initial import
[replication] fleshing out the api
[gemfile] use integration group for everything
[replication] almost there
[replication] use same name convention for sentinel
[replication] use 2.6.11 in source for sentinel
[replication] sentinel lwrp works
[replication] all sentinel data_bag item instances
[replication] add default sentinels array so data_bags.rb doesn't die