[vesti] Add support for vesti.ru videos and live streams (Closes #2376)

youtube_dl/extractor/__init__.py

@@ -230,6 +230,7 @@ from .ustream import UstreamIE, UstreamChannelIE
 from .vbox7 import Vbox7IE
 from .veehd import VeeHDIE
 from .veoh import VeohIE
+from .vesti import VestiIE
 from .vevo import VevoIE
 from .vice import ViceIE
 from .viddler import ViddlerIE