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/actions/streaming.js

@@ -92,3 +92,4 @@ export const connectCommunityStream = () => connectTimelineStream('community', '
 export const connectMediaStream = () => connectTimelineStream('community', 'public:local');
 export const connectPublicStream = () => connectTimelineStream('public', 'public');
 export const connectHashtagStream = (tag) => connectTimelineStream(`hashtag:${tag}`, `hashtag&tag=${tag}`);
+export const connectDirectStream = () => connectTimelineStream('direct', 'direct');