Update tests to use official xunit

test/Microsoft.AspNet.Hosting.Tests/project.json

@@ -2,13 +2,13 @@
     "dependencies": {
         "Microsoft.AspNet.Hosting": "1.0.0-*",
         "Microsoft.AspNet.RequestContainer": "1.0.0-*",
-        "Xunit.KRunner": "1.0.0-*"
+        "xunit.runner.kre": "1.0.0-*"
     },
     "frameworks": {
         "aspnet50": { }
     },
     "commands": {
-        "test": "Xunit.KRunner"
+        "test": "xunit.runner.kre"
     },
     "webroot": "testroot"
 }

test/Microsoft.AspNet.TestHost.Tests/TestServerTests.cs

@@ -23,8 +23,8 @@ namespace Microsoft.AspNet.TestHost
             // Arrange
             var services = HostingServices.Create().BuildServiceProvider();
 
-            // Act & Assert
-            Assert.DoesNotThrow(() => TestServer.Create(services, app => { }));
+            // Act & Assert (Does not throw)
+            TestServer.Create(services, app => { });
         }
 
         [Fact]

test/Microsoft.AspNet.TestHost.Tests/project.json

@@ -1,10 +1,10 @@
 {
     "dependencies": {
         "Microsoft.AspNet.TestHost": "1.0.0-*",
-        "Xunit.KRunner": "1.0.0-*"
+        "xunit.runner.kre": "1.0.0-*"
     },
     "commands": {
-        "test": "Xunit.KRunner"
+        "test": "xunit.runner.kre"
     },
     "frameworks": {
         "aspnet50": { }