Add more feature constructors.

Author: Tratcher

src/Microsoft.AspNet.PipelineCore/FormFeature.cs

@@ -1,6 +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.Collections.Generic;
 using System.IO;
 using System.Text;
 using System.Threading;
@@ -20,6 +21,11 @@ public class FormFeature : IFormFeature
         private Stream _bodyStream;
         private IReadableStringCollection _form;
 
+        public FormFeature([NotNull] IDictionary<string, string[]> form)
+            : this (new ReadableStringCollection(form))
+        {
+        }
+
         public FormFeature([NotNull] IReadableStringCollection form)
         {
             _form = form;

src/Microsoft.AspNet.PipelineCore/QueryFeature.cs

@@ -1,6 +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.Collections.Generic;
 using Microsoft.AspNet.FeatureModel;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.HttpFeature;
@@ -16,6 +17,11 @@ public class QueryFeature : IQueryFeature
         private string _queryString;
         private IReadableStringCollection _query;
 
+        public QueryFeature([NotNull] IDictionary<string, string[]> query)
+            : this (new ReadableStringCollection(query))
+        {
+        }
+
         public QueryFeature([NotNull] IReadableStringCollection query)
         {
             _query = query;

src/Microsoft.AspNet.PipelineCore/RequestCookiesFeature.cs

@@ -2,9 +2,10 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Collections.Generic;
+using Microsoft.AspNet.FeatureModel;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Http.Infrastructure;
-using Microsoft.AspNet.FeatureModel;
 using Microsoft.AspNet.HttpFeature;
 using Microsoft.AspNet.PipelineCore.Collections;
 using Microsoft.AspNet.PipelineCore.Infrastructure;
@@ -19,6 +20,11 @@ public class RequestCookiesFeature : IRequestCookiesFeature
         private RequestCookiesCollection _cookiesCollection;
         private IReadableStringCollection _cookies;
 
+        public RequestCookiesFeature([NotNull] IDictionary<string, string[]> cookies)
+            : this (new ReadableStringCollection(cookies))
+        {
+        }
+
         public RequestCookiesFeature([NotNull] IReadableStringCollection cookies)
         {
             _cookies = cookies;