[planetaplay/quickvid/vube] Skip inaccessible sites

youtube_dl/extractor/planetaplay.py

@@ -18,7 +18,8 @@ class PlanetaPlayIE(InfoExtractor):
             'id': '3586',
             'ext': 'flv',
             'title': 'md5:e829428ee28b1deed00de90de49d1da1',
-        }
+        },
+        'skip': 'Not accessible from Travis CI server',
     }
 
     _SONG_FORMATS = {

youtube_dl/extractor/quickvid.py

@@ -24,6 +24,7 @@ class QuickVidIE(InfoExtractor):
             'thumbnail': 're:^https?://.*\.(?:png|jpg|gif)$',
             'view_count': int,
         },
+        'skip': 'Not accessible from Travis CI server',
     }
 
     def _real_extract(self, url):

youtube_dl/extractor/vube.py

@@ -36,6 +36,7 @@ class VubeIE(InfoExtractor):
                 'comment_count': int,
                 'categories': ['amazing', 'hd', 'best drummer ever', 'william wei', 'bucket drumming', 'street drummer', 'epic street drumming'],
             },
+            'skip': 'Not accessible from Travis CI server',
         }, {
             'url': 'http://vube.com/Chiara+Grispo+Video+Channel/YL2qNPkqon',
             'md5': 'db7aba89d4603dadd627e9d1973946fe',