feat: Make CLI available without install

This small change will allow consumers of the CLI to have their projects shared with anyone, even if they don't have the CLI installed.

They just clone, and run `npm install`, and then they can all interesting stuff they want directly from the CLI by using `npm run ng -- ` instead of `ng`.

It also helps people who may have multiple projects created by the CLI not all upgraded to the latest version, matching their global install.

Close #3126

packages/angular-cli/blueprints/ng2/files/package.json

@@ -4,6 +4,7 @@
   "license": "MIT",
   "angular-cli": {},
   "scripts": {
+    "ng": "ng",
     "start": "ng serve",
     "lint": "tslint \"<%= sourceDir %>/**/*.ts\"",
     "test": "ng test",