Move form download out of UsersController and into its own controller.

While debugging the browser notifications it bothered me that form downloads are on the UsersController. So I stopped my time clock and fixed it.

@ericisaiah Have a look. I want to merge this ASAP before we diverge.
Why was the download stylesheet referenced twice?

I left it because I thought it might be a weird cascade problem, but we should figure it out and DRY it up.