Add an extractor for Ooyala (closes #833)

Only works for some sites, it doesn't work for videos that use a f4m manifest

youtube_dl/extractor/__init__.py

@@ -48,6 +48,7 @@ from .mtv import MTVIE
 from .myspass import MySpassIE
 from .myvideo import MyVideoIE
 from .nba import NBAIE
+from .ooyala import OoyalaIE
 from .photobucket import PhotobucketIE
 from .pornotube import PornotubeIE
 from .rbmaradio import RBMARadioIE