[comedycentral] Only recognize the cc.com domain

The old comedycentral.com urls redirect to the new urls.

youtube_dl/extractor/comedycentral.py

@@ -14,13 +14,13 @@ from ..utils import (
 
 
 class ComedyCentralIE(MTVServicesInfoExtractor):
-    _VALID_URL = r'''(?x)https?://(?:www\.)?(comedycentral|cc)\.com/
+    _VALID_URL = r'''(?x)https?://(?:www\.)?cc\.com/
         (video-clips|episodes|cc-studios|video-collections|full-episodes)
         /(?P<title>.*)'''
     _FEED_URL = 'http://comedycentral.com/feeds/mrss/'
 
     _TEST = {
-        'url': 'http://www.comedycentral.com/video-clips/kllhuv/stand-up-greg-fitzsimmons--uncensored---too-good-of-a-mother',
+        'url': 'http://www.cc.com/video-clips/kllhuv/stand-up-greg-fitzsimmons--uncensored---too-good-of-a-mother',
         'md5': 'c4f48e9eda1b16dd10add0744344b6d8',
         'info_dict': {
             'id': 'cef0cbb3-e776-4bc9-b62e-8016deccb354',