Added a timeline for Direct statuses

* Lists all Direct statuses you've sent and received
* Displayed in Getting Started
* Streaming server support for direct TL

app/javascript/mastodon/reducers/settings.js

@@ -57,6 +57,12 @@ const initialState = ImmutableMap({
       body: '',
     }),
   }),
+
+  direct: ImmutableMap({
+    regex: ImmutableMap({
+      body: '',
+    }),
+  }),
 });
 
 const defaultColumns = fromJS([