• Added support for high priority fast lane.
  
• Added each method to Minion::Iterator.
  
• Added min_priority option to dequeue methods in Minion::Worker and Minion::Backend::Pg.
  
• Added spare and spare_min_priority options to run method in Minion::Worker.
  
• Added -s and -S options to worker command.
  
• Added --retry-failed and --remove-failed options to job command.