Fix for console err: Uncaught ReferenceError: global is not defined

See: angular/angular-cli#8160

Author: Cody Burleson

src/polyfills.ts

@@ -78,3 +78,6 @@ import 'zone.js/dist/zone';  // Included with Angular CLI.
 /***************************************************************************************************
  * APPLICATION IMPORTS
  */
+
+// Add global to window, assigning the value of window itself.
+(window as any).global = window;