Add an extractor for videodetective.com (closes #262)

It uses the internetvideoarchive.com platform.

youtube_dl/extractor/__init__.py

@@ -123,6 +123,7 @@
 from .vevo import VevoIE
 from .vice import ViceIE
 from .viddler import ViddlerIE
+from .videodetective import VideoDetectiveIE
 from .videofyme import VideofyMeIE
 from .vimeo import VimeoIE, VimeoChannelIE
 from .vine import VineIE

youtube_dl/extractor/videodetective.py

@@ -0,0 +1,30 @@
+import re
+
+from .common import InfoExtractor
+from .internetvideoarchive import InternetVideoArchiveIE
+from ..utils import (
+    compat_urlparse,
+)
+
+
+class VideoDetectiveIE(InfoExtractor):
+    _VALID_URL = r'https?://www\.videodetective\.com/[^/]+/[^/]+/(?P<id>\d+)'
+
+    _TEST = {
+        u'url': u'http://www.videodetective.com/movies/kick-ass-2/194487',
+        u'file': u'194487.mp4',
+        u'info_dict': {
+            u'title': u'KICK-ASS 2',
+            u'description': u'md5:65ba37ad619165afac7d432eaded6013',
+            u'duration': 135,
+        },
+    }
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        video_id = mobj.group('id')
+        webpage = self._download_webpage(url, video_id)
+        og_video = self._og_search_video_url(webpage)
+        query = compat_urlparse.urlparse(og_video).query
+        return self.url_result(InternetVideoArchiveIE._build_url(query),
+            ie=InternetVideoArchiveIE.ie_key())