trival fix to remove reference of sbt in README
KAFKA-1459 follow up minor patch
KAFKA-1468 Misc. improvements from benchmarking.
kafka-924 (follow-up); Specify console consumer properties via a single --property command line parameter;;  patched by Sriharsha Chintalapani; reviewed by Jun Rao
kafka-1473; transient unit test failure in testRequestHandlingDuringDeleteTopic;  patched by Guozhang Wang; reviewed by Jun Rao
KAFKA-1438 Migrate client tools out of perf; reviewed by Neha Narkhede
KAFKA-1443 Add delete topic option to topic commands; reviewed by Neha Narkhede
KAFKA-1469 Util.abs function does not return correct absolute values for negative values; patched by Guozhang Wang and Neha Narkhede
kafka-1438 (follow-up); Migrate client tools out of perf;  patched by Sriharsha Chintalapani; reviewed by Jun Rao
KAFKA-1298 (followup); Controlled shutdown tool doesn't seem to work out of the box;  patched by Sriharsha Chintalapani; reviewed by Jun Rao
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.