Introducing attachments fixes for blog posts and assets.

Requires migration of attachments schema using
python manage.py maintenance upgrade_attachment_schema --all

src/templates/layout.jade

@@ -427,8 +427,11 @@ html(lang="en")
 				$('[data-toggle="popover"]').popover();
 			}
 
+		| {% block footer_scripts_pre %}{% endblock %}
 		| {% block footer_scripts %}{% endblock %}
 
+
+
 		script.
 			(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
 			(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),