Changed IsAllRepublished on PublishingEventArgs to be readonly (pretty sure it supposed to be like that)

src/Umbraco.Core/EventArgs.cs

@@ -2,9 +2,21 @@
 {
 	
 	//Publishing Events
-    public class PublishingEventArgs : System.ComponentModel.CancelEventArgs {
-        public bool IsAllRepublished { get; set; }
+    public class PublishingEventArgs : System.ComponentModel.CancelEventArgs 
+	{
+	    public PublishingEventArgs()
+	    {
+		    IsAllRepublished = false;
+	    }
+
+	    public PublishingEventArgs(bool isAllPublished)
+	    {
+		    IsAllRepublished = isAllPublished;
+	    }
+
+        public bool IsAllRepublished { get; private set; }
     }
+
     public class SendToPublishEventArgs : System.ComponentModel.CancelEventArgs { }
 
     //Moving object Events

src/Umbraco.Core/Publishing/PublishingStrategy.cs

@@ -221,7 +221,7 @@ namespace Umbraco.Core.Publishing
         /// <param name="isAllRepublished">Boolean indicating whether its all content that is republished</param>
         public override void PublishingFinalized(IEnumerable<IContent> content, bool isAllRepublished)
         {
-            OnPublished(content, new PublishingEventArgs { IsAllRepublished = isAllRepublished });
+			OnPublished(content, new PublishingEventArgs(isAllRepublished));
         }
 
         /// <summary>