Run work in different thread #8
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Fix #14(Worker Push Notifications)
The problem
Some tasks that require a long execution time were blocking pika's ioloop which stop heartbeats to reach RabbitMQ. When RabbitMQ doesn't recive a heartbeat for a long time it considers the worker dead and resend the message, which create some duplicates because the worker did not die.
The solution
Runs the worker in a different thread so it can take as long as necessary while keeping his heart beating.
Obs.: Using this PR also requires to update Pika to 0.12.0