kafka-1035; Add message-send-max-retries and retry-backoff-ms options to console producer; patched by Rajasekar Elango; reviewed by Guaozhang Wang and Jun Rao
KAFKA-1046 Added support for Scala 2.10 builds while maintaining compatibility with 2.8.x; reviewed by Neha and Jun
KAFKA-955 (followup patch) After a leader change, messages sent with ack=0 are lost; reviewed by Neha Narkhede and Jun Rao
KAFKA-1038; fetch response should use empty messageset instead of null when handling errors; patched by Jun Rao; reviewed by Neha Narkhede