Make new template use the site layout
Update title translation key for new attachment

Add the translation for English
Add the attachment id to the serializable hash

See crowdcover/crowdcover#214

When an attachment is created or the JSON data is retrieved it needs to
include the id. This is specifically important so the attachment.id can
be added to a Story section's array of attachments.
Add jquery.fileupload script and dependencies

See crowdcover/crowdcover#214

These jQuery plugins will help with asynchronous file uploading. See
https://github.com/blueimp/jQuery-File-Upload for more information about
the fileupload plugin.

* [jquery.fileupload.5.40.1](https://github.com/blueimp/jQuery-File-Upload/blob/8dc29ded32a0f2caad86ebbdf8b23a22375ae78c/js/jquery.fileupload.js)
* [jquery.iframe-transport.1.8.2](https://github.com/blueimp/jQuery-File-Upload/blob/8dc29ded32a0f2caad86ebbdf8b23a22375ae78c/js/jquery.iframe-transport.js)
Super simple async file upload demo

See crowdcover/crowdcover#214

Only prints upload information out via `console.log` but the files do
get uploaded.