fixes #512 - Read and display Zap2It id for tv series

MediaBrowser.Controller/Providers/BaseItemXmlParser.cs

@@ -605,6 +605,14 @@ namespace MediaBrowser.Controller.Providers
                     }
                     break;
 
+                case "Zap2ItId":
+                    var zap2ItId = reader.ReadElementContentAsString();
+                    if (!string.IsNullOrWhiteSpace(zap2ItId))
+                    {
+                        item.SetProviderId(MetadataProviders.Zap2It, zap2ItId);
+                    }
+                    break;
+
                 case "IMDB_ID":
                 case "IMDB":
                 case "IMDbId":

MediaBrowser.Providers/Savers/XmlSaverHelpers.cs

@@ -83,7 +83,8 @@ namespace MediaBrowser.Providers.Savers
                     "DeathDate",
                     "LockedFields",
                     "Chapters",
-                    "MusicBrainzReleaseGroupId"
+                    "MusicBrainzReleaseGroupId",
+                    "Zap2ItId"
                 });
 
                 var position = xml.ToString().LastIndexOf("</", StringComparison.OrdinalIgnoreCase);
@@ -327,6 +328,13 @@ namespace MediaBrowser.Providers.Savers
                 builder.Append("<RottenTomatoesId>" + SecurityElement.Escape(rt) + "</RottenTomatoesId>");
             }
 
+            var zap2It = item.GetProviderId(MetadataProviders.Zap2It);
+
+            if (!string.IsNullOrEmpty(zap2It))
+            {
+                builder.Append("<Zap2ItId>" + SecurityElement.Escape(zap2It) + "</Zap2ItId>");
+            }
+
             var mbz = item.GetProviderId(MetadataProviders.Musicbrainz);
 
             if (!string.IsNullOrEmpty(mbz))