Fix wait() foreign promise compatibility

1.1.0 release

* Update EachPromise to immediately resolve when the underlying promi…

…se iterator

  is empty. Previously, such a promise would throw an exception when its `wait`
  function was called.

* Conditionally require functions.php.

* Updating EachPromise to call next on the underlying promise iterato…

…r as late

  as possible to ensure that generators that generate new requests based on
  callbacks are not iterated until after callbacks are invoked.

Initial release

No need to run the queue when resolved

Adding checks to ensure promises are not resolved or rejected twice

Initial release