Switch test to metacafe.com, whose DNS seems to be fine atm

test/tests.json

@@ -13,7 +13,7 @@
   {
     "name": "Metacafe",
     "add_ie": ["Youtube"],
-    "url":  "http://www.metacafe.com/watch/yt-_aUehQsCQtM/the_electric_company_short_i_pbs_kids_go/",
+    "url":  "http://metacafe.com/watch/yt-_aUehQsCQtM/the_electric_company_short_i_pbs_kids_go/",
     "file":  "_aUehQsCQtM.flv"
   },
   {