Split out 'socket' hosting model into a separate optional NuGet package, since most developers won't need it

src/Microsoft.AspNetCore.NodeServices.Sockets/project.json

@@ -0,0 +1,39 @@
+{
+  "description": "Socket-based RPC for Microsoft.AspNetCore.NodeServices",
+  "version": "1.1.0-*",
+  "packOptions": {
+    "repository": {
+      "type": "git",
+      "url": "git://github.com/aspnet/javascriptservices"
+    },
+    "tags": [
+      "aspnetcore",
+      "aspnetcoremvc",
+      "nodeservices"
+    ]
+  },
+  "buildOptions": {
+    "warningsAsErrors": true,
+    "keyFile": "../../tools/Key.snk",
+    "embed": [
+      "Content/**/*"
+    ],
+    "xmlDoc": true
+  },
+  "dependencies": {
+    "Microsoft.AspNetCore.NodeServices": "1.1.0-*"
+  },
+  "frameworks": {
+    "net451": {
+      "dependencies": {
+        "Microsoft.Tpl.Dataflow": "4.5.24"
+      }
+    },
+    "netstandard1.6": {
+      "dependencies": {
+        "System.IO.Pipes": "4.3.0",
+        "System.Threading.Tasks.Dataflow": "4.7.0"
+      }
+    }
+  }
+}