chore(bundles): don't distribute sfx bundles for http

Currently the main sfx bundle already contains http and router
and the http sfx bundles duplicates all core.

Additionally https://github.com/angular/angular/issues/5223
modifies our strategy for individual bundles

Closes #5434

modules/angular2/src/http/http_sfx.ts

@@ -1,3 +0,0 @@
-import * as ngHttp from './http';
-
-(<any>window).ngHttp = ngHttp;