KAFKA-2803: Add hard bounce system test for Kafka Connect.

KAFKA-2812: Improve consumer integration tests.

KAFKA-2862: Fix MirrorMaker's message.handler.args description.

KAFKA-2872: Unite sink nodes with parent nodes in addSink.

KAFKA-2877: Handle request timeout in sync group.

KAFKA-2878: Guard against OutOfMemory in Kafka broker.

KAFKA-2879: Make MiniKDC test service slightly more generic.

KAFKA-2880: Consumer should handle disconnect/timeout for metadata requests.

KAFKA-2881: Improve Consumer Configs and API Documentation.

KAFKA-2882: Add constructor cache for Snappy and LZ4 Output/Input streams in Compressor.java.

KAFKA-2892: Consumer Docs Use Wrong Method.

KAFKA-2899: Improve logging when unexpected exceptions thrown in reading local log.

KAFKA-2906: Fix Connect javadocs, restrict only to api subproject, and clean up javadoc warnings.

KAFKA-2913: Missing partition check when removing groups from cache.

KAFKA-2942: Inadvertent auto-commit when pre-fetching can cause message loss.

KAFKA-2950: Fix performance regression in the producer.