Placing IServiceProvider on IBuilder

Replaces concept of features/items on builder instance for now

src/Microsoft.AspNet.Abstractions/IBuilder.cs

@@ -4,13 +4,12 @@ namespace Microsoft.AspNet.Abstractions
 {
     public interface IBuilder
     {
+        IServiceProvider ServiceProvider { get; set; }
+
         IBuilder Use(Func<RequestDelegate, RequestDelegate> middleware);
         IBuilder Run(RequestDelegate handler);
 
         IBuilder New();
         RequestDelegate Build();
-
-        object GetItem(Type type);
-        void SetItem(Type type, object feature);
     }
 }

src/Microsoft.AspNet.PipelineCore/Builder.cs

@@ -1,56 +1,20 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Threading.Tasks;
 using Microsoft.AspNet.Abstractions;
-using Microsoft.AspNet.FeatureModel;
 
 namespace Microsoft.AspNet.PipelineCore
 {
     public class Builder : IBuilder
     {
-        private readonly IFeatureCollection _interfaces;
-        private readonly IDictionary<string, object> _properties;
         private readonly IList<Func<RequestDelegate, RequestDelegate>> _components = new List<Func<RequestDelegate, RequestDelegate>>();
 
-        public Builder()
+        public Builder(IServiceProvider serviceProvider)
         {
-            _interfaces = new FeatureCollection();
-            _properties = new Dictionary<string, object>();
+            ServiceProvider = serviceProvider;
         }
 
-        public Builder(IFeatureCollection interfaces, IDictionary<string, object> properties)
-        {
-            _interfaces = interfaces;
-            _properties = properties;
-        }
-
-        public void Dispose()
-        {
-            _interfaces.Dispose();
-        }
-
-        public virtual object GetItem(Type key)
-        {
-            object value;
-            return _interfaces.TryGetValue(key, out value);
-        }
-
-        public virtual void SetItem(Type key, object value)
-        {
-            _interfaces[key] = value;
-        }
-
-        public virtual object GetItem(string key)
-        {
-            object value;
-            return _properties.TryGetValue(key, out value);
-        }
-
-        public virtual void SetItem(string key, object value)
-        {
-            _properties[key] = value;
-        }
+        public IServiceProvider ServiceProvider { get; set; }
 
         public IBuilder Use(Func<RequestDelegate, RequestDelegate> middleware)
         {
@@ -65,7 +29,7 @@ namespace Microsoft.AspNet.PipelineCore
 
         public IBuilder New()
         {
-            return new Builder(_interfaces, _properties);
+            return new Builder(ServiceProvider);
         }
 
         public RequestDelegate Build()