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!

framework/core/ember/Brocfile.js

@@ -2,7 +2,13 @@
 
 var EmberApp = require('ember-cli/lib/broccoli/ember-app');
 
-var app = new EmberApp();
+var app = new EmberApp({
+	vendorFiles: {
+		'handlebars.js': null
+	}
+});
+
+app.import('bower_components/ember/ember-template-compiler.js');
 
 app.import('bower_components/bootstrap/dist/js/bootstrap.js');
 app.import('bower_components/spin.js/spin.js');