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/initializers/inject-components.js

@@ -1,7 +1,10 @@
 export default {
   name: 'inject-components',
   initialize: function(container, application) {
+    application.inject('adapter', 'alerts', 'controller:alerts')
     application.inject('component', 'alerts', 'controller:alerts')
     application.inject('component', 'composer', 'controller:composer')
+    application.inject('model', 'session', 'simple-auth-session:main')
+    application.inject('component', 'session', 'simple-auth-session:main')
   }
 };