Move HttpRequestIdentifierFeature to HttpAbsractions

Author: benaadams

src/Microsoft.AspNet.Hosting/Internal/FastHttpRequestIdentifierFeature.cs

@@ -6,8 +6,7 @@
         "url": "git://github.com/aspnet/hosting"
     },
     "compilationOptions": {
-        "warningsAsErrors": true,
-        "allowUnsafe": true
+        "warningsAsErrors": true
     },
     "dependencies": {
         "Microsoft.AspNet.FileProviders.Physical": "1.0.0-*",

src/Microsoft.AspNet.Hosting/project.json

@@ -305,7 +305,7 @@ public void HostingEngine_CreatesDefaultRequestIdentifierFeature_IfNotPresent()
 
             // Assert
             Assert.NotNull(httpContext);
-            Assert.IsType<FastHttpRequestIdentifierFeature>(httpContext.Features.Get<IHttpRequestIdentifierFeature>());
+            Assert.IsType<HttpRequestIdentifierFeature>(httpContext.Features.Get<IHttpRequestIdentifierFeature>());
         }
 
         [Fact]