Theme Search export and search spinner

[wshayes]

Theme the Search dataset export button feature and the search spinner

[kellymccann91]

Theming for the export is done - search spinner for experimental context?

[wshayes]

Search spinner - for the search page. There is a spinner that is ugly that I inserted that works when you update the search (e.g. click on a facet checkbox and you should see it pop up at the top of the search page above the search text field).