Merge pull request mattermost#2531 from mattermost/websocket-fix

Removing extranious this in websockets.

action_creators/websocket_actions.jsx

@@ -142,7 +142,7 @@ export function sendMessage(msg) {
  conn.send(JSON.stringify(msg));
  } else if (!conn || conn.readyState === WebSocket.Closed) {
  conn = null;
- this.initialize();
+ initialize();
  }
 }