fix(Typings): Output public constructors in .d.ts files

Closes #3926.

Closes #3963

modules/angular2/test_lib.ts

@@ -2,3 +2,9 @@
 export * from './test';
 export * from './src/test_lib/utils';
 export * from './src/test_lib/fake_async';
+export {ComponentRef, HostViewRef} from './src/core/compiler';
+
+// This interface is referenced by TestComponents, however we can't export it directly from router
+// because router pulls in dart:html & dart:js and we import test_lib in standalone VM tests
+// so we re-create the interface here.
+export interface InjectableReference {}