TimeJobsByClass needs around_perform not around_perform_in_parent_process
Clear up confusing comment
rename sandbox to children
use cleaner has_key? over double negation
log the backtrace of the child workers when sent USR2 (a feature currently in master)
REDIS_URL should not be deprecated.
get SubprocessWorkerRunner out of the top level namespace
rename max_startup_interval to max_startup_delay
fix a comment typo
fix a spec