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/components/application/back-button.js

@@ -0,0 +1,30 @@
+import Ember from 'ember';
+
+/**
+  The back/pin button group in the top-left corner of Flarum's interface.
+ */
+export default Ember.Component.extend({
+  classNames: ['back-button'],
+  classNameBindings: ['active'],
+
+  active: Ember.computed.or('target.paneIsShowing', 'target.paneIsPinned'),
+
+  mouseEnter: function() {
+    this.get('target').send('showPane');
+  },
+
+  mouseLeave: function() {
+    this.get('target').send('hidePane');
+  },
+
+  actions: {
+    back: function() {
+      this.get('target').send('transitionFromBackButton');
+      this.set('target', null);
+    },
+
+    togglePinned: function() {
+      this.get('target').send('togglePinned');
+    }
+  }
+});

ember/app/components/application/forum-statistic.js

@@ -0,0 +1,7 @@
+import Ember from 'ember';
+
+var precompileTemplate = Ember.Handlebars.compile;
+
+export default Ember.Component.extend({
+  layout: precompileTemplate('{{number}} {{label}}')
+});

ember/app/components/application/go-to-top.js

@@ -0,0 +1,12 @@
+import Ember from 'ember';
+
+import ActionButton from 'flarum/components/ui/action-button';
+
+export default ActionButton.extend({
+  title: 'Go to Top',
+  icon: 'arrow-up',
+  className: 'control-top',
+  action: function() {
+    $('html, body').stop(true).animate({scrollTop: 0});
+  }
+})

ember/app/components/application/powered-by.js

@@ -0,0 +1,7 @@
+import Ember from 'ember';
+
+var precompileTemplate = Ember.Handlebars.compile;
+
+export default Ember.Component.extend({
+  layout: precompileTemplate('<a href="http://flarum.org" target="_blank">Powered by Flarum</a>')
+});

ember/app/components/application/user-dropdown.js

@@ -0,0 +1,27 @@
+import Ember from 'ember';
+
+import HasItemLists from 'flarum/mixins/has-item-lists';
+import DropdownButton from 'flarum/components/ui/dropdown-button';
+import SeparatorItem from 'flarum/components/ui/separator-item';
+
+export default DropdownButton.extend(HasItemLists, {
+  layoutName: 'components/application/user-dropdown',
+  itemLists: ['items'],
+
+  buttonClass: 'btn btn-default btn-naked btn-rounded btn-user',
+  menuClass: 'pull-right',
+  label: Ember.computed.alias('user.username'),
+
+  populateItems: function(items) {
+    this.addActionItem(items, 'profile', 'Profile', 'user');
+    this.addActionItem(items, 'settings', 'Settings', 'cog');
+    items.pushObject(SeparatorItem.create());
+    this.addActionItem(items, 'logout', 'Log Out', 'sign-out', null, null, this);
+  },
+
+  actions: {
+    logout: function() {
+      this.logout();
+    }
+  }
+})