refactor(core): introduce ViewRef and ProtoViewRef

BREAKING CHANGES:
- `NgElement` merged into `ElementRef`
- `Compiler.compile…` returns `ProtoViewRef`
- `ViewContainer` uses `ProtoViewRef`s and `ViewRef`s.
- `ViewRef`/`ProtoViewRef` in renderer were renamed to
  `RenderViewRef`/`RenderProtoViewRef`.

Related to #1477
Closes #1592

modules/angular2/src/test_lib/test_bed.js

@@ -9,6 +9,7 @@ import {View} from 'angular2/src/core/annotations/view';
 
 import {TemplateResolver} from 'angular2/src/core/compiler/template_resolver';
 import {AppView} from 'angular2/src/core/compiler/view';
+import {internalView} from 'angular2/src/core/compiler/view_ref';
 import {DynamicComponentLoader, ComponentRef} from 'angular2/src/core/compiler/dynamic_component_loader';
 
 import {queryView, viewRootNodes, el} from './utils';
@@ -103,7 +104,7 @@ export class ViewProxy {
 
   constructor(componentRef: ComponentRef) {
     this._componentRef = componentRef;
-    this._view = componentRef.hostView.componentChildViews[0];
+    this._view = internalView(componentRef.hostView).componentChildViews[0];
   }
 
   get context(): any {

modules/angular2/src/test_lib/test_lib.es6

@@ -276,7 +276,15 @@ export class SpyObject {
   constructor(type = null) {
     if (type) {
       for (var prop in type.prototype) {
-        var m = type.prototype[prop];
+        var m = null;
+        try {
+          m = type.prototype[prop];
+        } catch (e) {
+          // As we are creating spys for abstract classes,
+          // these classes might have getters that throw when they are accessed.
+          // As we are only auto creating spys for methods, this
+          // should not matter.
+        }
         if (typeof m === 'function') {
           this.spy(prop);
         }