[cbsnews] Add support for cbsnews.com (Closes #2691)

youtube_dl/extractor/__init__.py

@@ -32,6 +32,7 @@ from .canal13cl import Canal13clIE
 from .canalplus import CanalplusIE
 from .canalc2 import Canalc2IE
 from .cbs import CBSIE
+from .cbsnews import CBSNewsIE
 from .ceskatelevize import CeskaTelevizeIE
 from .channel9 import Channel9IE
 from .chilloutzone import ChilloutzoneIE