Combines 68fe6903f7 and
7b7e707fa2.
We no longer use jQuery UI for anything since getting
rid of jQuery file uploader in 667a8a6,
so we can safely remove these now.
Also removes the blueimp-file-upload and jquery.iframe-transport
dependencies that were formerly used by jQuery file uploader
This reverts commit 2c7906999a.
The changes break some things in local development (putting JS files
into minified files, not allowing debugger, and others)