Release group is added to history and episodefile

NzbDrone.Core/Repository/EpisodeFile.cs

@@ -35,6 +35,7 @@ namespace NzbDrone.Core.Repository
         public long Size { get; set; }
         public DateTime DateAdded { get; set; }
         public string SceneName { get; set; }
+        public string ReleaseGroup { get; set; }
 
         [Ignore]
         public Model.Quality QualityWrapper

NzbDrone.Core/Repository/History.cs

@@ -17,6 +17,7 @@ namespace NzbDrone.Core.Repository
         public bool IsProper { get; set; }
         public string Indexer { get; set; }
         public string NzbInfoUrl { get; set; }
+        public string ReleaseGroup { get; set; }
 
         [ResultColumn]
         public Episode Episode { get; set; }