Add an extractor for syfy.com

It uses theplatfrom.com, which has been updated to work with f4m manifests

youtube_dl/extractor/__init__.py

@@ -203,6 +203,7 @@ from .stanfordoc import StanfordOpenClassroomIE
 from .statigram import StatigramIE
 from .steam import SteamIE
 from .streamcloud import StreamcloudIE
+from .syfy import SyfyIE
 from .sztvhu import SztvHuIE
 from .teamcoco import TeamcocoIE
 from .techtalks import TechTalksIE