[9gag] Like/dislike count (#1895)

youtube_dl/extractor/common.py

@@ -55,6 +55,9 @@ class InfoExtractor(object):
     subtitles:      The subtitle file contents as a dictionary in the format
                     {language: subtitles}.
     view_count:     How many users have watched the video on the platform.
+    like_count:     Number of positive ratings of the video
+    dislike_count:  Number of negative ratings of the video
+    comment_count:  Number of comments on the video
     urlhandle:      [internal] The urlHandle to be used to download the file,
                     like returned by urllib.request.urlopen
     age_limit:      Age restriction for the video, as an integer (years)

youtube_dl/extractor/ninegag.py

@@ -37,5 +37,7 @@ class NineGagIE(InfoExtractor):
             'title': data['title'],
             'description': data['description'],
             'view_count': int(data['view_count']),
+            'like_count': int(data['statistic']['like']),
+            'dislike_count': int(data['statistic']['dislike']),
             'thumbnail': data['thumbnail_url'],
         }