v2.1.0

• Locking to resque < 1.25.0 (for now)
• Ensuring Resque.schedule= sets rather than appends
• Process daemonization fixes including stdio redirection and redis client
  reconnection
• Add #scheduled_at which returns an array of timestamps at which the
  specified job is scheduled
• Syncing stdout/stderr
• Add #enqueue_delayed for enqueueing specific delayed jobs immediately
• Show server local time in resque-web
• Enqueue immediately if job is being enqueued in the past
• Using a logger instead of #puts, configurable via LOGFILE, VERBOSE, and
  MUTE environmental variables, as well as being settable via
  Resque::Scheduler#logger
• Fixing scheduler template when arrays are passed to rufus-scheduler
• Add support for configuring Resque::Scheduler.poll_sleep_amount via the
  INTERVAL environmental variable.
• Fixed shutdown in ruby 2.0.0
• Removed dependency on Resque::Helpers