Update Razor to use official xunit runner

Author: rynowak

test/Microsoft.AspNet.Razor.Runtime.Test/project.json

@@ -3,15 +3,16 @@
     "dependencies": {
         "Microsoft.AspNet.Razor.Runtime": "4.0.0-*",
         "Microsoft.AspNet.Testing": "1.0.0-*",
-        "Xunit.KRunner": "1.0.0-*"
+        "xunit.runner.kre": "1.0.0-*"
     },
     "commands": {
-        "test": "Xunit.KRunner"
+        "test": "xunit.runner.kre"
     },
     "frameworks": {
         "aspnet50": { },
         "aspnetcore50": {
             "dependencies": {
+                "System.Reflection.TypeExtensions": "4.0.0-beta-*",
                 "System.Runtime.Extensions": "4.0.10-beta-*"
             }
         }

test/Microsoft.AspNet.Razor.Test/TagHelpers/AddOrRemoveTagHelperSpanVisitorTest.cs

@@ -168,8 +168,10 @@ public void GetDescriptors_RemoveTagHelperNotInDocument_DoesNotThrow()
                     new ParserErrorSink());
             var document = new MarkupBlock(Factory.Markup("Hello World"));
 
-            // Act & Assert
-            Assert.DoesNotThrow(() => addOrRemoveTagHelperSpanVisitor.GetDescriptors(document));
+            // Act
+            var descriptors = addOrRemoveTagHelperSpanVisitor.GetDescriptors(document);
+
+            Assert.Empty(descriptors);
         }
 
         private class TestTagHelperDescriptorResolver : ITagHelperDescriptorResolver

test/Microsoft.AspNet.Razor.Test/project.json

@@ -5,16 +5,17 @@
         "Moq": "4.2.1312.1622",
         "Microsoft.AspNet.Razor": "4.0.0-*",
         "Microsoft.AspNet.Testing": "1.0.0-*",
-        "Xunit.KRunner": "1.0.0-*"
+        "xunit.runner.kre": "1.0.0-*"
     },
     "commands": {
-        "test": "Xunit.KRunner"
+        "test": "xunit.runner.kre"
     },
     "frameworks": {
         "aspnet50": { },
         "aspnetcore50": {
             "dependencies": {
-                "System.Diagnostics.TraceSource": "4.0.0-beta-*"
+                "System.Diagnostics.TraceSource": "4.0.0-beta-*",
+                "System.Reflection.TypeExtensions": "4.0.0-beta-*"
             }
         }
     }