Upgrade to Ember 1.11-beta.1

HTMLBars goodness! Since there was some breakage and a lot of fiddling
around to get some things working, I took this opportunity to do a big
cleanup of the whole Ember app. I accidentally worked on some new
features too :3

Note that the app is still broken right now, pending on
https://github.com/emberjs/ember.js/issues/10401

Cleanup:
- Restructuring of components
- Consolidation of some stuff into mixins, cleanup of some APIs that
will be public
- Change all instances of .property() / .observes() / .on() to
Ember.computed() / Ember.observer() / Ember.on() respectively (I think
it is more readable)
- More comments
- Start conforming to a code style (2 spaces for indentation)

New features:
- Post hiding/restoring
- Mark individual discussions as read by clicking
- Clicking on a read discussion jumps to the end
- Mark all discussions as read
- Progressively mark the discussion as read as the page is scrolled
- Unordered list post formatting
- Post permalink popup

Demo once that Ember regression is fixed!

ember/app/models/user.js

@@ -1,23 +1,20 @@
 import DS from 'ember-data';
 
 export default DS.Model.extend({
+  username: DS.attr('string'),
+  email: DS.attr('string'),
+  password: DS.attr('string'),
+  avatarUrl: DS.attr('string'),
 
-	username: DS.attr('string'),
-	avatarUrl: DS.attr('string'),
-	joinTime: DS.attr('date'),
-	lastSeenTime: DS.attr('date'),
-	discussionsCount: DS.attr('number'),
-	postsCount: DS.attr('number'),
+  groups: DS.hasMany('group'),
 
-	canEdit: DS.attr('boolean'),
-	canDelete: DS.attr('boolean'),
+  joinTime: DS.attr('date'),
+  lastSeenTime: DS.attr('date'),
+  readTime: DS.attr('date'),
 
-	groups: DS.hasMany('group'),
+  discussionsCount: DS.attr('number'),
+  postsCount: DS.attr('number'),
 
-	email: DS.attr('string'),
-	password: DS.attr('string'),
-
-    avatarNumber: function() {
-        return Math.random() > 0.3 ? Math.floor(Math.random() * 19) + 1 : null;
-    }.property()
+  canEdit: DS.attr('boolean'),
+  canDelete: DS.attr('boolean')
 });