Merge pull request #1677 from rzhxeo/xtube

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

diff --combined youtube_dl/extractor/__init__.py
index f44f4214fce36d312bf0fe55ea3817ec4fbfd147,7efd097e4d24a31b523570e074047b4bccb944c0..8dad38a007dfcab9767b7f790d8f1af794d44580
--- 1/youtube_dl/extractor/__init__.py
--- 2/youtube_dl/extractor/__init__.py
+++ b/youtube_dl/extractor/__init__.py
@@@ -9,7 -9,6 +9,7 @@@ from .arte import 
      ArteTVFutureIE,
  )
  from .auengine import AUEngineIE
 +from .bambuser import BambuserIE, BambuserChannelIE
  from .bandcamp import BandcampIE
  from .bliptv import BlipTVIE, BlipTVUserIE
  from .bloomberg import BloombergIE
@@@ -40,7 -39,6 +40,7 @@@ from .ehow import EHowI
  from .eighttracks import EightTracksIE
  from .escapist import EscapistIE
  from .exfm import ExfmIE
 +from .extremetube import ExtremeTubeIE
  from .facebook import FacebookIE
  from .faz import FazIE
  from .fktv import (
@@@ -85,7 -83,6 +85,7 @@@ from .mit import TechTVMITIE, MITI
  from .mixcloud import MixcloudIE
  from .mtv import MTVIE
  from .muzu import MuzuTVIE
 +from .myspace import MySpaceIE
  from .myspass import MySpassIE
  from .myvideo import MyVideoIE
  from .naver import NaverIE
@@@ -144,7 -141,6 +144,7 @@@ from .videofyme import VideofyMeI
  from .videopremium import VideoPremiumIE
  from .vimeo import VimeoIE, VimeoChannelIE
  from .vine import VineIE
 +from .vk import VKIE
  from .wat import WatIE
  from .websurg import WeBSurgIE
  from .weibo import WeiboIE
@@@ -153,6 -149,7 +153,7 @@@ from .worldstarhiphop import WorldStarH
  from .xhamster import XHamsterIE
  from .xnxx import XNXXIE
  from .xvideos import XVideosIE
+ from .xtube import XTubeIE
  from .yahoo import YahooIE, YahooSearchIE
  from .youjizz import YouJizzIE
  from .youku import YoukuIE