Support for Kafka 0.10

• Add protocol support for ApiVersionRequest (dpkp PR 678)
• KAFKA-3025: Message v1 -- add timetamp and relative offsets (dpkp PR 693)
• Use Fetch/Produce API v2 for brokers >= 0.10 (uses message format v1) (dpkp PR 694)
• Use standard LZ4 framing for v1 messages / kafka 0.10 (dpkp PR 695)

Consumers

• Update SimpleConsumer / legacy protocol to handle compressed messages (paulcavallaro PR 684)

Producers

• KAFKA-3388: Fix expiration of batches sitting in the accumulator (dpkp PR 699)
• KAFKA-3197: when max.in.flight.request.per.connection = 1, attempt to guarantee ordering (dpkp PR 698)
• Dont use soon-to-be-reserved keyword await as function name (FutureProduceResult) (dpkp PR 697)

Clients

• Fix socket leaks in KafkaClient (dpkp PR 696)

Documentation

Internals

• Support SSL CRL requires python 2.7.9+ / 3.4+
• Use original hostname for SSL checks (vincentbernat PR 682)
• Always pass encoded message bytes to MessageSet.encode()
• Raise ValueError on protocol encode/decode errors
• Supplement socket.gaierror exception in BrokerConnection.connect() (erikbeebe PR 687)
• BrokerConnection check_version: expect 0.9 to fail with CorrelationIdError
• Fix small bug in Sensor (zackdever PR 679)