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

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

@@ -0,0 +1,18 @@
+{
+  "name": "nodeservices.sockets",
+  "version": "1.0.0",
+  "description": "This is not really an NPM package and will not be published. This file exists only to reference compilation tools.",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build": "./node_modules/.bin/webpack"
+  },
+  "author": "Microsoft",
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@types/node": "^6.0.42",
+    "ts-loader": "^0.8.2",
+    "typescript": "^2.0.0",
+    "webpack": "^1.13.1"
+  }
+}