Merge pull request #1659 by @rzhxeo

Add support for http://www.tube8.com

youtube_dl/extractor/__init__.py

@@ -124,6 +124,7 @@ from .tf1 import TF1IE
 from .thisav import ThisAVIE
 from .traileraddict import TrailerAddictIE
 from .trilulilu import TriluliluIE
+from .tube8 import Tube8IE
 from .tudou import TudouIE
 from .tumblr import TumblrIE
 from .tutv import TutvIE