Correcting WebFx failure on CI machines

- a single test is failing under CoreCLR only
- using the resource-related properties of a `ValidationAttribute` in
  precisely one place – the failing test.
- in .NET the DataAnnotations assembly is somehow able to get access to
  `internal` resources
- that doesn’t work under CoreCLR
- short-term fix is to add an `[InternalsVisibleTo]` in the test
  assembly, giving DataAnnotations access to the resource

Will also file a bug in the DataAnnotations repo

test/Microsoft.AspNet.Mvc.ModelBinding.Test/Properties/AssemblyInfo.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft Open Technologies, Inc.
+// All Rights Reserved
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR
+// CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
+// WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
+// TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR
+// NON-INFRINGEMENT.
+// See the Apache 2 License for the specific language governing
+// permissions and limitations under the License.
+
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("Microsoft.ComponentModel.DataAnnotations")]