Merge pull request #277 from cova-fe/master

Allow redis_namespace to be configured also in file stanzas
Merge pull request #279 from cova-fe/master

Added rabbitmq_delivery_mode as configuration parameter
Add message_batch size checking since SQS can only handle 256KiB
in a batch. Flush queue if message_batch is 10 messages or >= 250KiB
Merge pull request #280 from ronnocol/sqsbatchsize

Add message_batch size checking since SQS can only handle 256KiB