feat(@schematics/angular): use app as an alias for the application schematic

Author: beeman

packages/schematics/angular/collection.json

@@ -19,6 +19,7 @@
       "schema": "./service-worker/schema.json"
     },
     "application": {
+      "aliases": [ "app" ],
       "factory": "./application",
       "schema": "./application/schema.json",
       "description": "Create an Angular application."