Update Modulefile.
Update Kafka server.properties to be consistent with 0.8.1
Add log4j config management.

Fixes error with log-cleaner file permissions due to undefined path.
Add more parameters.  Allow specification of zookeeper members.

Zookeeper members are specified as an array of hashes.
Fix notification of services.
Allow broker_id to be set via custom fact.
Use undef rather than empty string.

Change broker_id to kafka_broker_id to avoid Hiera namespace clash.
Initial commit of Zookeeper parameters.
Add more Zookeeper parameters.
Add ZooKeeper Replication.

Some bug fixes / typos too!
Typo, guff leftover.
Create data and log dirs.

Remove redundant datastore parameter.
Consolidate params class into default.
Work around variable reassignment limitation.
Update myid with correct variable.
Remove default Zookeeper clustering config.
Update README.
Merge pull request #1 from tomstockton/master

Kafka / Zookeeper module enhancements (#851, #852, #853)