Make Pheanstalk bridge more flexible
Make Pheanstalk bridge more flexible

Implementation of exceptional cases with bury and release must happen
outside the scope of the bridge. The service is now aware of a logger
and a event manager, so it logs information at different priorities
into a log and triggers events at every action of the beanstalk
protocol.

juriansluiman/SlmQueue,malinink/SlmQueue,jackdpeterson/SlmQueue