[rice] Add new extractor(closes #1736)

youtube_dl/extractor/__init__.py

@@ -598,6 +598,7 @@ from .regiotv import RegioTVIE
 from .restudy import RestudyIE
 from .reverbnation import ReverbNationIE
 from .revision3 import Revision3IE
+from .rice import RICEIE
 from .ringtv import RingTVIE
 from .ro220 import Ro220IE
 from .rottentomatoes import RottenTomatoesIE