other resources:

  http://vitobotta.com/resque-automatically-kill-stuck-workers-retry-failed-jobs/#sthash.oQsaNeb5.dpbs
  http://stackoverflow.com/questions/10757758/find-out-if-a-resque-job-is-still-running-and-kill-it-if-its-stuck

## TODOS

verifications of @config options: raise if no handler, etc.
add daemon example to readme
add a 'resque_stuck_queue/tasks' bit? See tres eg
require 'resque/stuck_queue' instead?
ensure the logging gets flushed into log file correctly? (integration with god?)
add a trap{} to force_stop. ok for overwriting process's trap handlers? use config for that?