• Added EXPERIMENTAL support for expiring jobs.
  
• Removed experimental support for job sequences again since use cases turned out to be weaker than expected.
  
• Added EXPERIMENTAL expire option to enqueue method in Minion, Minion::Backend and Minion::Backend::Pg.
  
• Added expires field to list_jobs method in Minion::Backend::Pg.
  
• Added -E option to job command.