feat(di): added optional self parameter to Parent, Ancestor, and Unbounded

modules/angular2/test/core/compiler/element_injector_spec.ts

@@ -103,6 +103,12 @@ class NeedsDirectiveFromParent {
   constructor(@Parent() dependency: SimpleDirective) { this.dependency = dependency; }
 }
 
+@Injectable()
+class NeedsDirectiveFromParentOrSelf {
+  dependency: SimpleDirective;
+  constructor(@Parent({self:true}) dependency: SimpleDirective) { this.dependency = dependency; }
+}
+
 @Injectable()
 class NeedsDirectiveFromAncestor {
   dependency: SimpleDirective;
@@ -640,12 +646,21 @@ export function main() {
             expect(d.dependency).toBeAnInstanceOf(SimpleDirective);
           });
 
-          it("should not return parent's directives on self", () => {
+          it("should not return parent's directives on self by default", () => {
             expect(() => {
               injector(ListWrapper.concat([SimpleDirective, NeedsDirectiveFromParent], extraBindings));
             }).toThrowError(containsRegexp(`No provider for ${stringify(SimpleDirective) }`));
           });
 
+          it("should return parent's directives on self when explicitly specified", () => {
+            var inj = injector(ListWrapper.concat([SimpleDirective, NeedsDirectiveFromParentOrSelf], extraBindings));
+
+            var d = inj.get(NeedsDirectiveFromParentOrSelf);
+
+            expect(d).toBeAnInstanceOf(NeedsDirectiveFromParentOrSelf);
+            expect(d.dependency).toBeAnInstanceOf(SimpleDirective);
+          });
+
           it("should get directives from ancestor", () => {
             var child = parentChildInjectors(ListWrapper.concat([SimpleDirective], extraBindings),
                                              [NeedsDirectiveFromAncestor]);