KAFKA-1185 Improve leader elector module to have a resign API; reviewed by Guozhang Wang and Jun Rao
Rebased from trunk to resolve conflicts between KAFKA-1185 and KAFKA-930
KAFKA-1187 Controller should retry connecting to brokers to send state change requests; reviewed by Jun Rao and Guozhang Wang
kafka-1198; NullPointerException in describe topic; patched by Guozhang Wang; reviewed by Jun Rao
kafka-1074; Reassign partitions should delete the old replicas from disk; patched by Jun Rao; reviewed by Jay Kreps, Neha Narkhede and Guozhang Wang
KAFKA-1199 Add a reduced access log level; reviewed by Guozhang Wang and Jun Rao
KAFKA-1200 inconsistent log levels when consumed offset is reset patch by Dima Pekar reviewed by Joe Stein
kafka-1202; optimize ZK access in KafkaController; also incorporating fixes in kafka-1020; patched by Jun Rao and Guozhang Wang; reviewed by Neha Narkhede and Joel Koshy
kafka-1208; Update system test still to use kafka-topics instead of kafka-create-topics shell; patched by Guozhang Wang; reviewed by Jun Rao
kafka-1205; README in examples not update; patched by Ailing Zhang; reviewed by Jun Rao