Rejecting jqDeferred object does not fire the Fail event

When using the vanilla variant of imagesLoaded

``` javascript
var imgLoad = imagesLoaded( elem );
```

and listening for onAlways, onDone, and onFail

``` javascript
imgLoad.on('fail',callback)
```

telling the jqDeferred object to reject `imgLoad.jqDeferred.reject()` does not make it fire the fail event.
