fix(build): revert typescript upgrade which broke the build.

This reverts commit a7a9463624.
This reverts commit 59824e40e8.

modules/angular2/globals.ts

@@ -19,5 +19,6 @@ interface Window {
   JSON: typeof JSON;
   Math: typeof Math;
   assert: typeof assert;
+  NaN: typeof NaN;
   gc(): void;
 }

modules/angular2/src/facade/math.ts

@@ -6,4 +6,4 @@ import {global} from 'angular2/src/facade/lang';
 export var __esModule = true;
 
 export var Math = global.Math;
-export var NaN = typeof NaN;
+export var NaN = global.NaN;

modules/angular2/tsd.json

@@ -9,7 +9,7 @@
       "commit": "be0b6b394f77a59e192ad7cfec18078706e44db5"
     },
     "hammerjs/hammerjs.d.ts": {
-      "commit": "22c44d95912a07f81c103a694330b15b92f7cb40"
+      "commit": "be0b6b394f77a59e192ad7cfec18078706e44db5"
     },
     "jasmine/jasmine.d.ts": {
       "commit": "055b3172e8eb374a75826710c4d08677872620d3"
@@ -72,6 +72,9 @@
     "selenium-webdriver/selenium-webdriver.d.ts": {
       "commit": "be0b6b394f77a59e192ad7cfec18078706e44db5"
     },
+    "touch-events/touch-events.d.ts": {
+      "commit": "055b3172e8eb374a75826710c4d08677872620d3"
+    },
     "zone/zone.d.ts": {
       "commit": "055b3172e8eb374a75826710c4d08677872620d3"
     }