10 playlist download (#71)

* leveraging message queue for playlist entries DL

* playlist support implemented

It's a little bit slow but solid enough :D

server/rpc/handlers.go

@@ -7,7 +7,11 @@ import (
 	"github.com/gorilla/websocket"
 )
 
-var upgrader websocket.Upgrader
+var upgrader = websocket.Upgrader{
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
 
 func WebSocket(w http.ResponseWriter, r *http.Request) {
 	c, err := upgrader.Upgrade(w, r, nil)