• Added EXPERIMENTAL support for lax dependencies.
  
• Added EXPERIMENTAL lax option to enqueue method in Minion, Minion::Backend and Minion::Backend::Pg.
  
• Removed experimental status from notes option in Minion::Backend and Minion::Backend::Pg.
  
• Added lax field to list_jobs method in Minion::Backend::Pg.
  
• Added is_locked method to Minion.
  
• Added auto_retry_job method to Minion::Backend.
  
• Added parents method to Minion::Job.
  
• Added -x option to job command.
  
• Fixed a bug in Minion::Backend::Pg where manual retries would count towards the attempts limit for automatic
  retries.