Add southpark.cc.com to southpark IE

youtube_dl/extractor/southparkstudios.py

@@ -5,7 +5,7 @@ from .mtv import MTVServicesInfoExtractor
 
 class SouthParkStudiosIE(MTVServicesInfoExtractor):
     IE_NAME = 'southparkstudios.com'
-    _VALID_URL = r'https?://(www\.)?(?P<url>southparkstudios\.com/(clips|full-episodes)/(?P<id>.+?)(\?|#|$))'
+    _VALID_URL = r'https?://(www\.)?(?P<url>(?:southpark\.cc|southparkstudios)\.com/(clips|full-episodes)/(?P<id>.+?)(\?|#|$))'
 
     _FEED_URL = 'http://www.southparkstudios.com/feeds/video-player/mrss'