fix gravatars not showing

fix web config not saving Uri
fix issue with token login

SharedLibraryCore/Configuration/Attributes/ConfiguratinLinked.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace SharedLibraryCore.Configuration.Attributes
+{
+    [AttributeUsage(AttributeTargets.Property, Inherited = false)]
+    public class ConfiguratinLinked : Attribute
+    {
+        public string[] LinkedPropertyNames { get; set; }
+
+        public ConfiguratinLinked(params string[] linkedPropertyNames)
+        {
+            LinkedPropertyNames = linkedPropertyNames;
+        }
+    }
+}