Move BuilderExtensions and RouterMiddleware to Microsoft.AspNet

samples/RoutingSample.Web/Startup.cs

@@ -1,4 +1,5 @@
 using System.Text.RegularExpressions;
+using Microsoft.AspNet;
 using Microsoft.AspNet.Abstractions;
 using Microsoft.AspNet.Routing;
 

src/Microsoft.AspNet.Routing/BuilderExtensions.cs

@@ -1,8 +1,9 @@
 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
 
+using Microsoft.AspNet.Abstractions;
 using Microsoft.AspNet.Routing;
 
-namespace Microsoft.AspNet.Abstractions
+namespace Microsoft.AspNet
 {
     public static class BuilderExtensions
     {

src/Microsoft.AspNet.Routing/RouterMiddleware.cs

@@ -1,9 +1,10 @@
 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
 
 using System.Threading.Tasks;
+using Microsoft.AspNet.Abstractions;
 using Microsoft.AspNet.Routing;
 
-namespace Microsoft.AspNet.Abstractions
+namespace Microsoft.AspNet
 {
     public class RouterMiddleware
     {