Use a spinner icon instead of the word "Loading" for thumbnails that are
being processed in the background in a batch upload.
Also use morphdom to update thumbnails so we only update the parts of
the DOM that actually changed.
Add data attributes to thumbnails on the /uploads, /upload_media_assets,
and /media_assets pages. Add a `data-is-posted` attribute for styling
thumbnails based on whether they've already been posted.
* Add a "Size" menu to the My Uploads / All Uploads pages to allow
changing the thumbnail size.
* Make the My Uploads / All Uploads pages use the same thumbnail size as
the post index page.
* Change the "Gallery | Table" links on the My Uploads page to icons.
Fix the "My Uploads" page showing Admins all uploads, not just their own
uploads.
Changes the URL of the My Uploads page from /uploads to /users/:id/uploads.
This page shows each individual file you've uploaded. This is different
from the regular uploads page because files in multi-file uploads are
not grouped together.
