reenable(deep) {
    let prereqs;
    let prereq;
    this._skipped = false;
    this.taskStatus = Task.runStatuses.UNSTARTED;
    this.value = UNDEFINED_VALUE;
    if (deep && this.prereqs) {
      prereqs = this.prereqs;
      for (let i = 0, ii = prereqs.length; i < ii; i++) {
        prereq = jake.Task[prereqs[i]];
        if (prereq) {
          prereq.reenable(deep);
        }
      }
    }
  }
@name jake.Task#reenable
    @function
    @description Reenables a task so that it can be run again.