Add an extractor for Clipsyndicate (closes #1744)

youtube_dl/extractor/__init__.py

@@ -21,6 +21,7 @@ from .canalplus import CanalplusIE
 from .canalc2 import Canalc2IE
 from .cinemassacre import CinemassacreIE
 from .clipfish import ClipfishIE
+from .clipsyndicate import ClipsyndicateIE
 from .cnn import CNNIE
 from .collegehumor import CollegeHumorIE
 from .comedycentral import ComedyCentralIE, ComedyCentralShowsIE