Tagged Assets: Support passing arguments

Pass LOAD_INITIAL_COUNT and LOAD_NEXT_COUNT

Also only show 'Load more' if LOAD_NEXT_COUNT is not set to 0

src/templates/production.pug

@@ -7,7 +7,7 @@ script(src="{{ url_for('static_cloud', filename='assets/js/tagged_assets.min.js'
 
 script.
 	$(function() {
-		$('.js-asset-list').loadTaggedAssets();
+		$('.js-asset-list').loadTaggedAssets(5, 3);
 	})
 | {% endblock %}
 | {% block body %}