Add an extractor for rottentomatoes.com and improve InternetVideoArchiveIE to get the best quality

youtube_dl/extractor/rottentomatoes.py

@@ -0,0 +1,16 @@
+from .videodetective import VideoDetectiveIE
+
+
+# It just uses the same method as videodetective.com,
+# the internetvideoarchive.com is extracted from the og:video property
+class RottenTomatoesIE(VideoDetectiveIE):
+    _VALID_URL = r'https?://www\.rottentomatoes\.com/m/[^/]+/trailers/(?P<id>\d+)'
+
+    _TEST = {
+        u'url': u'http://www.rottentomatoes.com/m/toy_story_3/trailers/11028566/',
+        u'file': '613340.mp4',
+        u'info_dict': {
+            u'title': u'TOY STORY 3',
+            u'description': u'From the creators of the beloved TOY STORY films, comes a story that will reunite the gang in a whole new way.',
+        },
+    }