Fix tests to work on CoreClr (this does not fix the Xml tests failures)

test/WebSites/CorsMiddlewareWebSite/project.json

@@ -16,7 +16,7 @@
     },
     "frameworks": {
         "dnx451": { },
-        "dnx50": { }
+        "dnxcore50": { }
     },
     "webroot": "wwwroot"
 }

test/WebSites/CorsWebSite/project.json

@@ -16,7 +16,7 @@
     },
     "frameworks": {
         "dnx451": { },
-        "dnx50": { }
+        "dnxcore50": { }
     },
     "webroot": "wwwroot"
 }

test/WebSites/FilesWebSite/Controllers/EmbeddedFilesController.cs

@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
+using System.Reflection;
 using Microsoft.AspNet.FileProviders;
 using Microsoft.AspNet.Mvc;
 
@@ -13,7 +13,7 @@ namespace FilesWebSite
         {
             return new FilePathResult("/Greetings.txt", "text/plain")
             {
-                FileProvider = new EmbeddedFileProvider(GetType().Assembly, "EmbeddedResources"),
+                FileProvider = new EmbeddedFileProvider(GetType().GetTypeInfo().Assembly, "EmbeddedResources"),
                 FileDownloadName = "downloadName.txt"
             };
         }