Worker graceful shutdown (RichardKnop#543)

* wait in broker consuming goroutine until worker.Quit() completes

* wait in broker consuming goroutine until worker.Quit() completes for v2

[Worker] log when fetching group task states fail (RichardKnop#541)

[DynamoDB] Batch fetch task states (RichardKnop#539)

redact url (RichardKnop#533)

[DynamoDB] Support ResultsExpiresIn (RichardKnop#523)

chore: updated dependencies

Delete SQS message if unmarshalling fails (RichardKnop#504)

* Delete SQS message if unmarshalling fails

* Fix failing unit test

Merge pull request RichardKnop#446 from Sh4d1/multiple_aqmp

Add options for multiple amqp brokers

Merge pull request RichardKnop#482 from Martin91/fix-#122-deadlock

fix: an possible deadlock in amqp broker's consume()

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