Implemented allow anonymous for auth interception.

src/Volo.Abp.Authorization/Volo/Abp/Authorization/AbpAuthorizationPolicyProvider.cs

@@ -24,7 +24,6 @@ namespace Volo.Abp.Authorization
             var permission = _permissionDefinitionManager.GetOrNull(policyName);
 
             if (permission == null)
-
             {
                 return await base.GetPolicyAsync(policyName);
             }

src/Volo.Abp.Authorization/Volo/Abp/Authorization/MethodInvocationAuthorizationService.cs

@@ -16,7 +16,10 @@ namespace Volo.Abp.Authorization
 
         public async Task CheckAsync(MethodInvocationAuthorizationContext context)
         {
-            //TODO: Fully implement! (allow anonymous... etc.)
+            if (AllowAnonymous(context))
+            {
+                return;
+            }
 
             var authorizationAttributes = GetAuthorizationDataAttributes(context);
             foreach (var authorizationAttribute in authorizationAttributes)
@@ -25,6 +28,11 @@ namespace Volo.Abp.Authorization
             }
         }
 
+        protected virtual bool AllowAnonymous(MethodInvocationAuthorizationContext context)
+        {
+            return context.Method.GetCustomAttributes(true).OfType<IAllowAnonymous>().Any();
+        }
+
         protected virtual IAuthorizeData[] GetAuthorizationDataAttributes(MethodInvocationAuthorizationContext context)
         {
             return context.Method