Comments: trigger comments-loaded event on comments load.

Useful when apps want to know or do something with the comments,
like Dillo to parse emojis for example.

src/scripts/tutti/2_comments.js

@@ -147,6 +147,7 @@ function loadComments(commentsUrl)
 	.done(function(dataHtml) {
 		// Update the DOM injecting the generate HTML into the page
 		commentsContainer.html(dataHtml);
+		$('body').trigger('pillar:comments-loaded');
 	})
 	.fail(function(xhr) {
 		toastr.error('Could not load comments', xhr.responseText);