New: Release Group can now be used in rename patterns

src/NzbDrone.Core/Parser/Model/ParsedEpisodeInfo.cs

@@ -15,6 +15,7 @@ namespace NzbDrone.Core.Parser.Model
         public String AirDate { get; set; }
         public Language Language { get; set; }
         public bool FullSeason { get; set; }
+        public string ReleaseGroup { get; set; }
 
         public ParsedEpisodeInfo()
         {

src/NzbDrone.Core/Parser/Model/ReleaseInfo.cs

@@ -28,7 +28,6 @@ namespace NzbDrone.Core.Parser.Model
             }
         }
 
-        public string ReleaseGroup { get; set; }
         public int TvRageId { get; set; }
     }
 }