added background image to tests

Author: arut

test/www/bg.jpg

@@ -10,7 +10,8 @@
                 file: "rtmp://localhost/myapp?carg=1/mystream?sarg=2"
             }
         ],
-        autostart: true,
+        image: "http://localhost:8080/bg.jpg",
+        autostart: false,
         width: 640,
         height: 480,
         primary: "flash"