build: add --projects a.k.a the turbo button

we can now filter build graph via --project flag to speed up build performance

usage:

gulp test.unit.js --project=angular2,angular2_material

Closes #5272

modules/angular2/manual_typings/globals-es6.d.ts

@@ -8,8 +8,14 @@
 /// <reference path="../typings/hammerjs/hammerjs.d.ts"/>
 /// <reference path="../typings/jasmine/jasmine.d.ts"/>
 /// <reference path="../typings/angular-protractor/angular-protractor.d.ts"/>
+
+// TODO: ideally the node.d.ts reference should be scoped only for files that need and not to all
+//       the code including client code
+/// <reference path="../typings/node/node.d.ts" />
+
 declare var assert: any;
 
+
 interface BrowserNodeGlobal {
   Object: typeof Object;
   Array: typeof Array;