Responsive design baby!

Mobile responsive design with a very native feel, all in pure CSS (no
templating differences between versions — even though some things are
in very different positions.)

I’ve been working on this whole thing in my head for a while now,
planning out how certain components will be laid out on the mobile
version, and how to reason about them in the templates so that a
substantially different layout can still be achieved by only using CSS.
Today I finally wrote the CSS and it’s come together pretty damn
perfectly.

Still to come:
- Swiping left or right on discussions to reveal controls
- Tablet version

ember/app/components/ui/item-list.js

@@ -14,7 +14,10 @@ export default Ember.Component.extend({
       return [];
     }
     items.forEach(function(item) {
-      item.reopenClass({isListItem: item.proto().tagName === 'li'});
+      item.reopenClass({
+        isListItem: item.proto().tagName === 'li',
+        listItemClass: item.proto().listItemClass
+      });
     });
     return items;
   })