code: function unwatch (poet) {
    poet.watchers.forEach(function (watcher) {
      watcher.watcher.close();
    });
    poet.futures.forEach(function (future) {
      clearTimeout(future);
    });
    poet.watchers = [];
    poet.futures = [];
    return poet;
  }
docs: Removes all watchers from the `poet` instance so previously registered
  callbacks are not called again