refactor: export core APIs from angular2/core

This change moves many APIs to the angular2/core export.

This change also automatically adds FORM_BINDINGS in
the application root injector.

BREAKING CHANGE:
    Many dependencies that were previously exported from specific
    APIs are now exported from angular2/core. Affected exports, which
    should now be included from angular2/core include:

    angular2/forms
    angular2/di
    angular2/directives
    angular2/change_detection
    angular2/bootstrap (except for dart users)
    angular2/render
    angular2/metadata
    angular2/debug
    angular2/pipes
Closes #3977

modules/examples/e2e_test/routing/routing_spec.ts

@@ -4,7 +4,7 @@ import {Promise} from 'angular2/src/core/facade/async';
 function waitForElement(selector) {
   var EC = (<any>protractor).ExpectedConditions;
   // Waits for the element with id 'abc' to be present on the dom.
-  browser.wait(EC.presenceOf($(selector)), 10000);
+  browser.wait(EC.presenceOf($(selector)), 20000);
 }
 
 describe('routing inbox-app', function() {