RetryPolicy interface
Workable thing has a RetryPolicy instance
By default Jobs are not retriable
From namespace to inner document in Job as MongoDB document
Remove dependency between Workable and RetryPolicy
Extract WorkableInJob from Job
Extract RetryPolicyInJob from Job
Better encapsulation of Workable and RetryPolicy persistence in Job
Removed recruiter instance from Job
Apply RetryPolicy
Some retry policies
Exercize retry with bin/round_to_completion
Update what to do