Do not include store properties on Entity serialization

src/mesh/model/Entity.as

@@ -452,6 +452,7 @@ package mesh.model
 		}
 
 		private var _storeKey:Object;
+		[Transient]
 		/**
 		 * The global unique identifier assigned to this entity by the store.
 		 */

src/mesh/model/store/Commits.as

@@ -110,7 +110,14 @@ package mesh.model.store
 			var snapshot:ByteArray = new ByteArray();
 			snapshot.writeObject(entities);
 			snapshot.position = 0;
-			return snapshot.readObject();
+
+			var copied:Array = snapshot.readObject();
+			var len:int = entities.length;
+			for (var i:int = 0; i < len; i++) {
+				copied[i].storeKey = entities[i].storeKey;
+			}
+
+			return copied;
 		}
 
 		private var _checkpoint:Commit;