refactor(di): removed @Parent

BREAKING CHANGE
    The @Parent annotation has been removed. Use @Ancestor instead.
    @Parent was used to enforce a particular DOM structure (e.g., a pane component is a direct child of the tabs component).
    DI is not the right mechanism to do it. We should enforce it using schema instead.

modules/angular2/di.ts

@@ -10,7 +10,6 @@ export {
   InjectableMetadata,
   VisibilityMetadata,
   SelfMetadata,
-  ParentMetadata,
   AncestorMetadata,
   UnboundedMetadata,
   DependencyMetadata,
@@ -24,12 +23,12 @@ export {forwardRef, resolveForwardRef, ForwardRefFn} from './src/di/forward_ref'
 export {
   Injector,
   ProtoInjector,
+  BindingWithVisibility,
   DependencyProvider,
   PUBLIC_AND_PRIVATE,
   PUBLIC,
   PRIVATE,
   undefinedValue
-
 } from './src/di/injector';
 export {Binding, BindingBuilder, ResolvedBinding, Dependency, bind} from './src/di/binding';
 export {Key, KeyRegistry, TypeLiteral} from './src/di/key';