Use endpoint for chat history instead of websocket (#67)

* Change placeholder when chat is disabled

* Use the /chat endpoint for bulk chat history population instead of websocket. For #47

* Force LiveUI/seek bar during live to show. Closes #11.

* Change pulling chat history into app.js

* Force new messages to have visability = true

core/chat/client.go

@@ -111,6 +111,7 @@ func (c *Client) listenRead() {
 			msg.ID = id
 			msg.MessageType = "CHAT"
 			msg.Timestamp = time.Now()
+			msg.Visible = true
 
 			if err := websocket.JSON.Receive(c.ws, &msg); err == io.EOF {
 				c.doneCh <- true