KAFKA-1382. Update zkVersion on partition state update failures; reviewed by Neha Narkhede
KAFKA-1472; Add the compression ratio metrics in the new producer; patched by Dong Lin; reviewed by Guozhang Wang and Jun Rao
KAFKA-1488; new metrics for measuring the ratio when the new producer is block for space allocation; patched by Jun Rao; reviewed by Guozhang Wang and Joel Koshy
KAFKA-1326 Refactor Sender to support consumer.
KAFKA-1382 follow up patch; reviewed by Neha Narkhede
KAFKA-1316 Follow-up patch for concurrent modification exception.
KAFKA-1291 Add wrapper scripts and usage information to each command.
KAFKA-1096 An old controller coming out of long GC could update its epoch to the latest controller's epoch; reviewed by Neha Narkhede
KAFKA-1491; Always read coordinator information in consumer metadata response; reviewed by Neha Narkhede.
KAFKA-1498 Misc. producer performance enhancements. Patch from Guozhang.
KAFKA-1498 Follow-up: add metric on avg record size.
KAFKA-1308 Publish jar of test utilities to Maven
kafka-1503; all partitions are using same broker as their leader after broker is down;  patched by Jianwen Wang; reviewed by Guozhang Wang and Jun Rao
kafka-1513; Cleanup KafkaServerStartable code; patched by Evgeny Vereshchagin; reviewed by Jun Rao
KAFKA-1519 Make it possible to disable the line seperator in the console consumer. Patch from Gwen Shapira.