CSV uploading animation

[stevieflow]

As data is being uploaded by the CSV file, include a progress bar / spinning wheel (!) animation to indicate there is progress..........

[amercader]

How to do it:

Quickest way I can think of is adding a small js script that listens to the submit event for the upload form and shows a hidden div with the animation.

https://github.com/okfn/ckanext-iati/blob/master/ckanext/iati/theme/templates/csv/upload.html#L22

(Proper fix is of course make the whole thing asynchronous and periodically refresh the page while it waits for the server to finish)