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/web_workers/todo/todo_spec.ts

@@ -16,5 +16,5 @@ describe('WebWorkers Todo', function() {
 });
 
 function waitForBootstrap(): void {
-  browser.wait(protractor.until.elementLocated(by.css("todo-app #todoapp")), 5000);
+  browser.wait(protractor.until.elementLocated(by.css("todo-app #todoapp")), 15000);
 }