chore(ts): duplicate the .es6 files in the facade directory to TypeScript.

Adds a gulp task which builds the .ts files (in the cjs build only).
The new files have extension .ts since they are now valid typescript.
Unfortunately until Typescript can emit System.require, we have to keep the old .es6 version
so traceur works inside the Karma preprocessor. This should be fixed soon.

modules/angular2/globals.ts

@@ -0,0 +1,23 @@
+/**
+ * This file contains declarations of global symbols we reference in our code
+ */
+
+declare var assert: any;
+declare var global: Window;
+type int = number;
+
+interface List<T> extends Array<T> {}
+
+interface Window {
+  Object: typeof Object;
+  Array: typeof Array;
+  Map: typeof Map;
+  Set: typeof Set;
+  Date: typeof Date;
+  RegExp: typeof RegExp;
+  JSON: typeof JSON;
+  Math: typeof Math;
+  assert: typeof assert;
+  NaN: typeof NaN;
+  gc(): void;
+}