Delayed_job (or DJ) encapsulates the common pattern of 
asynchronously executing longer tasks in the background. 
It is a direct extraction from Shopify where the job table 
is responsible for a multitude of core tasks. This gem is 
collectiveidea's fork (http://github.com/collectiveidea/delayed_job).

WWW: https://github.com/collectiveidea/delayed_job