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/post.js

@@ -2,25 +2,23 @@ import Ember from 'ember';
 import DS from 'ember-data';
 
 export default DS.Model.extend({
+  discussion: DS.belongsTo('discussion', {inverse: 'loadedPosts'}),
+  number: DS.attr('number'),
 
-	discussion: DS.belongsTo('discussion', {inverse: 'loadedPosts'}),
-	number: DS.attr('number'),
+  time: DS.attr('date'),
+  user: DS.belongsTo('user'),
+  type: DS.attr('string'),
+  content: DS.attr('string'),
+  contentHtml: DS.attr('string'),
 
-	time: DS.attr('date'),
-	user: DS.belongsTo('user'),
-	type: DS.attr('string'),
-	content: DS.attr('string'),
-	contentHtml: DS.attr('string'),
+  editTime: DS.attr('date'),
+  editUser: DS.belongsTo('user'),
+  isEdited: Ember.computed.notEmpty('editTime'),
 
-	editTime: DS.attr('date'),
-	editUser: DS.belongsTo('user'),
-	isEdited: Ember.computed.notEmpty('editTime'),
-
-	deleteTime: DS.attr('date'),
-	deleteUser: DS.belongsTo('user'),
-	isDeleted: Ember.computed.notEmpty('deleteTime'),
-
-	canEdit: DS.attr('boolean'),
-	canDelete: DS.attr('boolean')
+  isHidden: DS.attr('boolean'),
+  deleteTime: DS.attr('date'),
+  deleteUser: DS.belongsTo('user'),
 
+  canEdit: DS.attr('boolean'),
+  canDelete: DS.attr('boolean')
 });