Load discussion and posts with one request

Speeds things up a heap.
Also fix a whole bunch of bugs with the post stream.

ember/app/initializers/find-query-one.js

@@ -0,0 +1,25 @@
+import DS from 'ember-data';
+
+// This can be removed when
+// https://github.com/emberjs/data/pull/2584 is implemented.
+
+export default {
+  name: 'find-query-one',
+  initialize: function(container) {
+    DS.Store.reopen({
+      findQueryOne: function(type, id, query) {
+        var store = this;
+        var typeClass = store.modelFor(type);
+        var adapter = store.adapterFor(typeClass);
+        var serializer = store.serializerFor(typeClass);
+        var url = adapter.buildURL(type, id);
+        var ajaxPromise = adapter.ajax(url, 'GET', { data: query });
+
+        return ajaxPromise.then(function(rawPayload) {
+          var extractedPayload = serializer.extract(store, typeClass, rawPayload, id, 'find');
+          return store.push(typeClass, extractedPayload);
+        });
+      }
+    });
+  }
+};