Support for creating pools on demand

[arpunk]

kanin should be able to spawn new pools on demand given an AMQP configuration. This configuration should include host, port, queue, exchange, queue opts, exchange opts, general pool opts (number of workers, pool config and load balancing strategies, etc).

It should provide sane defaults if none is given.

This enable us to create new pools and start consuming messages in the fly. This is useful in some scenarios such as prototyping or managing subscriptions/publications to different exchanges on demand.

It should be able to stop them as well.

Tasks:

• Design a comprehensive configuration scheme for kanin - Design a comprehensive configuration scheme for kanin #23
• Define default kanin configuration that follows scheme - Define default kanin configuration that follows scheme #24
• Update kanin gen_server to utilize new configuration - Update kanin gen_server to utilize new configuration #25
• Ensure kanin connection pool setup utilizes new configuration - Ensure kanin connection pool setup utilizes new configuration #26

Part of epic #27

[oubiwann]

Nice! Adding to milestone 0.8.0 ...