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/src/core/compiler/element_injector.ts

@@ -397,7 +397,7 @@ export class ProtoElementInjector {
               public directiveVariableBindings: Map<string, number>) {
     var length = bwv.length;
 
-    this.protoInjector = new ProtoInjector(bwv, distanceToParent);
+    this.protoInjector = new ProtoInjector(bwv);
 
     this.eventEmitterAccessors = ListWrapper.createFixedSize(length);
     this.hostActionAccessors = ListWrapper.createFixedSize(length);