Link to uploaded images from success notification

Imgur can display a page with multiple images by separating their IDs with commas, like http://imgur.com/VlD65Tt,FE6ncAO. Notifications can open web pages like this:

``` ruby
TerminalNotifier.notify 'Hello world', open: 'https://github.com/raws/alfred-imgur'
```

It would be cool to link the "upload successful" notification to an Imgur page displaying all of the uploaded images.
