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/utils/human-time.js

@@ -1,42 +1,42 @@
 import Ember from 'ember';
 
 moment.locale('en', {
-    relativeTime : {
-        future: "in %s",
-        past:   "%s ago",
-        s:  "seconds",
-        m:  "1m",
-        mm: "%dm",
-        h:  "1h",
-        hh: "%dh",
-        d:  "1d",
-        dd: "%dd",
-        M:  "a month",
-        MM: "%d months",
-        y:  "a year",
-        yy: "%d years"
-    }
+  relativeTime : {
+    future: "in %s",
+    past: "%s ago",
+    s:  "seconds",
+    m:  "1m",
+    mm: "%dm",
+    h:  "1h",
+    hh: "%dh",
+    d:  "1d",
+    dd: "%dd",
+    M:  "a month",
+    MM: "%d months",
+    y:  "a year",
+    yy: "%d years"
+  }
 });
 
 export default function(time) {
-    var m = moment(time);
+  var m = moment(time);
 
-    var minute = 6e4;
-    var hour = 36e5;
-    var day = 864e5;
-    var ago = null;
+  var minute = 6e4;
+  var hour = 36e5;
+  var day = 864e5;
+  var ago = null;
 
-    var diff = m.diff(moment());
+  var diff = m.diff(moment(new Date));
 
-    if (diff < -30 * day) {
-        if (m.year() === moment().year()) {
-            ago = m.format('D MMM');
-        } else {
-            ago = m.format('MMM \'YY');
-        }
+  if (diff < -30 * day) {
+    if (m.year() === moment(new Date).year()) {
+      ago = m.format('D MMM');
     } else {
-        ago = m.fromNow();
+      ago = m.format('MMM \'YY');
     }
+  } else {
+    ago = m.fromNow();
+  }
 
-    return ago;
-};
+  return ago;
+};