[nuevo] Generalize nuevo extractor and add support for trollvids

Supports only the nuevo player for now (most common).

[trollvids] convert duration to an int

[trollvids] added a test

[trollvids] made flake8 shut up

Generalized the Nuevo extractor

Affects: anitube, trollvids, trutube

[nuevo] Complied with the code comments.

youtube_dl/extractor/trutube.py

@@ -1,10 +1,9 @@
 from __future__ import unicode_literals
 
-from .common import InfoExtractor
-from ..utils import xpath_text
+from .nuevo import NuevoBaseIE
 
 
-class TruTubeIE(InfoExtractor):
+class TruTubeIE(NuevoBaseIE):
     _VALID_URL = r'https?://(?:www\.)?trutube\.tv/(?:video/|nuevo/player/embed\.php\?v=)(?P<id>[0-9]+)'
     _TESTS = [{
         'url': 'http://trutube.tv/video/14880/Ramses-II-Proven-To-Be-A-Red-Headed-Caucasoid-',
@@ -22,19 +21,11 @@ class TruTubeIE(InfoExtractor):
 
     def _real_extract(self, url):
         video_id = self._match_id(url)
+        config_url = 'https://trutube.tv/nuevo/player/config.php?v=%s' % video_id
 
-        config = self._download_xml(
-            'https://trutube.tv/nuevo/player/config.php?v=%s' % video_id,
-            video_id, transform_source=lambda s: s.strip())
+        info = self._extract_nuevo(config_url, video_id)
 
-        # filehd is always 404
-        video_url = xpath_text(config, './file', 'video URL', fatal=True)
-        title = xpath_text(config, './title', 'title').strip()
-        thumbnail = xpath_text(config, './image', ' thumbnail')
+        # filehd always 404s
+        info['formats'] = info['formats'][:1]
 
-        return {
-            'id': video_id,
-            'url': video_url,
-            'title': title,
-            'thumbnail': thumbnail,
-        }
+        return info