code: function _hasJob(id) {
      var job = _jobs[id] || _runningJobs[id] || _waitingJobs[id];
      return job ? __extend(job) : null;
    }
docs: Returns true if a job with the specified id is currently running or
  waiting, and false else.
  
  @param  {String}  id The id of the job.
  @return {?Object} Returns the job object if it exists.