feat(test): add test bundle

Create a bundle for the test library, TestComponentBuilder,
TestInjector, and DebugElement.

Internal tests use a superset of the bundle.

modules/angular2/test.ts

@@ -7,5 +7,7 @@
  * This module is not included in the `angular2` module; you must import the test module explicitly.
  *
  */
+export * from './src/test_lib/test_lib';
 export * from './src/test_lib/test_component_builder';
 export * from './src/test_lib/test_injector';
+export * from './debug';