Housekeeping (#1772)

* rimraf was not being used

* one less use of lodash dep

* shorter name variant

* one less lodash fn being used

* use native forEach

* result was a object

* one less lodash recommendation

* more explicit path

* removed a unused variable

lib/seq.js

@@ -26,7 +26,7 @@ import { promiseCallback, PROMISE_SYMBOL } from './internal/promiseCallback.js'
  * app.get('/cats', function(request, response) {
  *     var User = request.models.User;
  *     async.seq(
- *         _.bind(User.get, User),  // 'User.get' has signature (id, callback(err, data))
+ *         User.get.bind(User),  // 'User.get' has signature (id, callback(err, data))
  *         function(user, fn) {
  *             user.getCats(fn);      // 'getCats' has signature (callback(err, data))
  *         }