WIP - Okay, we have notification of the background process *starting*, but A) not finishing, and B) there's no way to 'just get the file' if it's already there and ready.
WIP - don't use this version, I'm mucking about.
WIP - Again, don't use this version, it's completely untested; I am just fleshing out the ideas that I had. Will refine things later.
Okay, background jobs are working, trackable, and deletable. ...Though there's some housekeeping to do, this is usable for demo purposes. ...Errr... PRIVATE demo purposes...
Merge branch 'background_files' into virtuoso

Conflicts:
	app/controllers/data_search_controller.rb