fix(sfx): Include ngHttp in SFX bundle

fixes: angular#3934

Closes angular#3933

modules/angular2/angular2_sfx.ts

@@ -1,15 +1,17 @@
 import * as ng from './angular2';
-// the router should have its own SFX bundle
-// But currently the module arithmetic 'angular2/router_sfx - angular2/angular2',
+// the router and http should have their own SFX bundle
+// But currently the module arithemtic 'angular2/router_sfx - angular2/angular2',
 // is not support by system builder.
 import * as router from './router';
+import * as http from './http';
 
 var _prevNg = (<any>window).ng;
 
 (<any>window).ng = ng;
 
 
 (<any>window).ngRouter = router;
+(<any>window).ngHttp = http;
 /**
  * Calling noConflict will restore window.angular to its pre-angular loading state
  * and return the angular module object.