Merge pull request vividvilla#1 from vividvilla/cassandra-backend

feat: add cassandra backend support

fix(kafka broker): task error channel not being consumed

fix(kafka broker): partitioned consumer group doesn't stop consuming

fix(kafka broker): partitioned consumer group doesn't stop consuming

feat: add kafka message size config

Merge pull request RichardKnop#440 from RichardKnop/fix-sqs-panic

fixed panic in SQS broker

Merge pull request RichardKnop#434 from bharat-p/433-expose-sqs-recei…

…pt-handle

Re:433 Expose SQS ReceiptHandle in task signature

Merge pull request RichardKnop#420 from Martin91/master

use routing key as both queue name and binding key

Merge pull request RichardKnop#410 from bitpeng/expiretime

the default expire time is 1 day, not 1 hour

Merge pull request RichardKnop#416 from alanchchen/feature/support-no…

…n-amqp-broker-with-amqp-backend

Support for using non-AMQP as broker and AMQP as result backend