feat(debug): replace DebugElement with new Debug DOM

Now, using `ng.probe(element)` in the browser console returns
a DebugElement when in dev mode.

`ComponentFixture#debugElement` also returns a new DebugElement.

Breaking Change:

This is a breaking change for unit tests. The API for the DebugElement
has changed. Now, there is a DebugElement or DebugNode for every node
in the DOM, not only nodes with an ElementRef. `componentViewChildren` is
removed, and `childNodes` is a list of ElementNodes corresponding to every
child in the DOM. `query` no longer takes a scope parameter, since
the entire rendered DOM is included in the `childNodes`.

Before:

```
componentFixture.debugElement.componentViewChildren[0];
```

After
```
// Depending on the DOM structure of your component, the
// index may have changed or the first component child
// may be a sub-child.
componentFixture.debugElement.children[0];
```

Before:

```
debugElement.query(By.css('div'), Scope.all());
```

After:

```
debugElement.query(By.css('div'));
```

Before:

```
componentFixture.debugElement.elementRef;
```

After:

```
componentFixture.elementRef;
```

modules/angular2/src/platform/browser_common.ts

@@ -30,12 +30,12 @@ import {BrowserDomAdapter} from './browser/browser_adapter';
 import {BrowserGetTestability} from 'angular2/src/platform/browser/testability';
 import {wtfInit} from 'angular2/src/core/profile/wtf_init';
 import {EventManager, EVENT_MANAGER_PLUGINS} from "angular2/src/platform/dom/events/event_manager";
+import {ELEMENT_PROBE_PROVIDERS} from 'angular2/platform/common_dom';
 export {DOCUMENT} from 'angular2/src/platform/dom/dom_tokens';
 export {Title} from 'angular2/src/platform/browser/title';
 export {
-  DebugElementViewListener,
   ELEMENT_PROBE_PROVIDERS,
-  ELEMENT_PROBE_BINDINGS,
+  ELEMENT_PROBE_PROVIDERS_PROD_MODE,
   inspectNativeElement,
   By
 } from 'angular2/platform/common_dom';
@@ -84,7 +84,8 @@ export const BROWSER_APP_COMMON_PROVIDERS: Array<any /*Type | Provider | any[]*/
   Testability,
   BrowserDetails,
   AnimationBuilder,
-  EventManager
+  EventManager,
+  ELEMENT_PROBE_PROVIDERS
 ]);
 
 export function initDomAdapter() {