Release thread attr handles and block default route on compression

Change default behaviour to a rd_kafka_assert

Remove double * comments
Merge pull request #105 from bartw72/mem_thrd_mgmt

Release thread attr handles and silence compiler warnings (unreached compression.codec code path)
Modified example to use zookeeper to build the broker-list

Add build dependencies for libzookeper and libjansson

Change to regular include structure

Reformat code and add additional logging on brokers found