Fix imports and general cleanup

· Import from compat what comes from compat. Yes, some names are available in utils too, but that's an implementation detail.
· Use _match_id consistently whenever possible
· Fix some outdated tests
· Use consistent valid URL (always match the whole protocol, no ^ at start required)
· Use modern test definitions

youtube_dl/extractor/videodetective.py

@@ -1,10 +1,8 @@
 from __future__ import unicode_literals
 
-import re
-
 from .common import InfoExtractor
+from ..compat import compat_urlparse
 from .internetvideoarchive import InternetVideoArchiveIE
-from ..utils import compat_urlparse
 
 
 class VideoDetectiveIE(InfoExtractor):
@@ -17,13 +15,12 @@ class VideoDetectiveIE(InfoExtractor):
             'ext': 'mp4',
             'title': 'KICK-ASS 2',
             'description': 'md5:65ba37ad619165afac7d432eaded6013',
-            'duration': 135,
+            'duration': 138,
         },
     }
 
     def _real_extract(self, url):
-        mobj = re.match(self._VALID_URL, url)
-        video_id = mobj.group('id')
+        video_id = self._match_id(url)
         webpage = self._download_webpage(url, video_id)
         og_video = self._og_search_video_url(webpage)
         query = compat_urlparse.urlparse(og_video).query