feat(tests): manage asynchronous tests using zones

Instead of using injectAsync and returning a promise, use the `async` function
to wrap tests. This will run the test inside a zone which does not complete
the test until all asynchronous tasks have been completed.

`async` may be used with the `inject` function, or separately.

BREAKING CHANGE:

`injectAsync` is now deprecated. Instead, use the `async` function
to wrap any asynchronous tests.

Before:
```
it('should wait for returned promises', injectAsync([FancyService], (service) => {
  return service.getAsyncValue().then((value) => { expect(value).toEqual('async value'); });
}));

it('should wait for returned promises', injectAsync([], () => {
  return somePromise.then(() => { expect(true).toEqual(true); });
}));
```

After:
```
it('should wait for returned promises', async(inject([FancyService], (service) => {
  service.getAsyncValue().then((value) => { expect(value).toEqual('async value'); });
})));

// Note that if there is no injection, we no longer need `inject` OR `injectAsync`.
it('should wait for returned promises', async(() => {
  somePromise.then() => { expect(true).toEqual(true); });
}));
```

Closes #7735

tools/broccoli/trees/node_tree.ts

@@ -76,7 +76,7 @@ module.exports = function makeNodeTree(projects, destinationPath) {
       'angular2/test/animate/**',
       'angular2/test/core/zone/**',
       'angular2/test/testing/fake_async_spec.ts',
-      'angular2/test/testing/testing_public_spec.ts',
+      'angular2/test/testing/testing_public_browser_spec.ts',
       'angular2/test/platform/xhr_impl_spec.ts',
       'angular2/test/platform/browser/**/*.ts',
       'angular2/test/common/forms/**',

tools/cjs-jasmine/index.js

@@ -3,9 +3,10 @@
 var glob = require('glob');
 var JasmineRunner = require('jasmine');
 var path = require('path');
+// require('es6-shim/es6-shim.js');
 require('zone.js/dist/zone-node.js');
 require('zone.js/dist/long-stack-trace-zone.js');
-require('es6-shim/es6-shim.js');
+require('zone.js/dist/async-test.js');
 require('reflect-metadata/Reflect');
 
 var jrunner = new JasmineRunner();
@@ -36,4 +37,5 @@ jrunner.projectBaseDir = path.resolve(__dirname, '../../');
 jrunner.specDir = '';
 jrunner.addSpecFiles(specFiles);
 require('./test-cjs-main.js');
+require('zone.js/dist/jasmine-patch.js');
 jrunner.execute();