Quicker visual feedback that download of clojuredocs snapshot has started

[jafingerhut]

One could imagine going as far as having a progress bar type display like web browsers do when downloading files, but that is probably too much implementation complexity unless there is a widget already on the shelf that can be used for it.

I think at a minimum, though, it would be good to pop up a window quickly indicating that the downloading has begun, so the user knows something is happening.