New: (Newznab) Parse PosterUrl when available

src/NzbDrone.Core/Indexers/Definitions/Newznab/NewznabRssParser.cs

@@ -99,6 +99,7 @@ namespace NzbDrone.Core.Indexers.Newznab
             releaseInfo.ImdbId = GetImdbId(item);
             releaseInfo.Grabs = GetGrabs(item);
             releaseInfo.Files = GetFiles(item);
+            releaseInfo.PosterUrl = GetPosterUrl(item);
 
             return releaseInfo;
         }
@@ -220,6 +221,11 @@ namespace NzbDrone.Core.Indexers.Newznab
             return 0;
         }
 
+        protected virtual string GetPosterUrl(XElement item)
+        {
+            return ParseUrl(TryGetNewznabAttribute(item, "coverurl"));
+        }
+
         protected virtual int GetFiles(XElement item)
         {
             var filesString = TryGetNewznabAttribute(item, "files");

src/NzbDrone.Core/Indexers/Definitions/Torznab/TorznabRssParser.cs

@@ -62,6 +62,7 @@ namespace NzbDrone.Core.Indexers.Torznab
                 }
 
                 torrentInfo.IndexerFlags = GetFlags(item);
+                torrentInfo.PosterUrl = GetPosterUrl(item);
             }
 
             return torrentInfo;
@@ -133,6 +134,11 @@ namespace NzbDrone.Core.Indexers.Torznab
             return !imdbIdString.IsNullOrWhiteSpace() ? imdbIdString.Substring(2) : null;
         }
 
+        protected virtual string GetPosterUrl(XElement item)
+        {
+            return ParseUrl(TryGetTorznabAttribute(item, "coverurl"));
+        }
+
         protected override string GetInfoHash(XElement item)
         {
             return TryGetTorznabAttribute(item, "infohash");